Simplifying introduction of new XEP implementations, implements FS#250 and FS#251 (Privacy and Security settings), refactoring of location of some interfaces

60 files changed, 1266 insertions, 386 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusPreferences.java b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusPreferences.java
index 546ad7ee..e59f5b57 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusPreferences.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusPreferences.java
@@ -14,6 +14,18 @@ public class ConversationsPlusPreferences extends Settings {
     private static ConversationsPlusPreferences instance;
     private final SharedPreferences sharedPreferences;
 
+    public static boolean sendEntityTime() {
+        return getBoolean("send_entity_time", true);
+    }
+
+    public static boolean sendSoftwareVersion() {
+        return getBoolean("send_software_info", true);
+    }
+
+    public static boolean sendOsInformation() {
+        return getBoolean("send_os_info", true);
+    }
+
     public static boolean logStanzas() {
         return getBoolean("log_stanzas", true);
     }
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java b/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
index 215e0995..9cf540a3 100644
--- a/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
@@ -50,6 +50,7 @@ import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
 import de.thedevstack.conversationsplus.xmpp.jid.InvalidJidException;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketReceiver;
 
 public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, AxolotlService {
 
@@ -414,8 +415,8 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 					Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
 				} else {
-					Element item = mXmppConnectionService.getIqParser().getItem(packet);
-					Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
+					Element item = IqPacketReceiver.getInstance().getLegacyIqParser().getItem(packet);
+					Set<Integer> deviceIds = IqPacketReceiver.getInstance().getLegacyIqParser().deviceIds(item);
 					if (!deviceIds.contains(getOwnDeviceId())) {
 						publishOwnDeviceId(deviceIds);
 					}
@@ -502,8 +503,8 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 					}
 				}
 
-				PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
-				Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
+				PreKeyBundle bundle = IqPacketReceiver.getInstance().getLegacyIqParser().bundle(packet);
+				Map<Integer, ECPublicKey> keys = IqPacketReceiver.getInstance().getLegacyIqParser().preKeyPublics(packet);
 				boolean flush = false;
 				if (bundle == null) {
 					Log.w(Config.LOGTAG, AxolotlServiceImpl.getLogprefix(account) + "Received invalid bundle:" + packet);
@@ -662,7 +663,7 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 			mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 				@Override
 				public void onIqPacketReceived(Account account, IqPacket packet) {
-					Pair<X509Certificate[],byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
+					Pair<X509Certificate[],byte[]> verification = IqPacketReceiver.getInstance().getLegacyIqParser().verification(packet);
 					if (verification != null) {
 						try {
 							Signature verifier = Signature.getInstance("sha256WithRSA");
@@ -741,7 +742,7 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 						fetchStatusMap.put(address, FetchStatus.TIMEOUT);
 					} else if (packet.getType() == IqPacket.TYPE.RESULT) {
 						Log.d(Config.LOGTAG, AxolotlServiceImpl.getLogprefix(account) + "Received preKey IQ packet, processing...");
-						final IqParser parser = mXmppConnectionService.getIqParser();
+						final IqParser parser = IqPacketReceiver.getInstance().getLegacyIqParser();
 						final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
 						final PreKeyBundle bundle = parser.bundle(packet);
 						if (preKeyBundleList.isEmpty() || bundle == null) {
diff --git a/src/main/java/de/thedevstack/conversationsplus/generator/AbstractGenerator.java b/src/main/java/de/thedevstack/conversationsplus/generator/AbstractGenerator.java
index 7302b2df..a8447a32 100644
--- a/src/main/java/de/thedevstack/conversationsplus/generator/AbstractGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/generator/AbstractGenerator.java
@@ -1,78 +1,15 @@
 package de.thedevstack.conversationsplus.generator;
 
-import android.util.Base64;
-
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
 import java.util.Locale;
 import java.util.TimeZone;
 
-import de.thedevstack.conversationsplus.ConversationsPlusApplication;
-import de.thedevstack.conversationsplus.xmpp.chatstate.ChatState;
-import de.thedevstack.conversationsplus.xmpp.iqversion.IqVersionPacket;
-import de.thedevstack.conversationsplus.xmpp.time.TimePacket;
-import de.tzur.conversations.Settings;
-import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
-
 public abstract class AbstractGenerator {
-	private static final String[] FEATURES = {
-			"urn:xmpp:jingle:1",
-			"urn:xmpp:jingle:apps:file-transfer:3",
-			"urn:xmpp:jingle:transports:s5b:1",
-			"urn:xmpp:jingle:transports:ibb:1",
-			"http://jabber.org/protocol/muc",
-			"jabber:x:conference",
-			"http://jabber.org/protocol/caps",
-			"http://jabber.org/protocol/disco#info",
-			"urn:xmpp:avatar:metadata+notify",
-			"http://jabber.org/protocol/nick+notify",
-			"urn:xmpp:ping",
-			TimePacket.NAMESPACE,
-			IqVersionPacket.NAMESPACE,
-			ChatState.NAMESPACE,
-			AxolotlService.PEP_DEVICE_LIST+"+notify"};
-	private static final String[] MESSAGE_CONFIRMATION_FEATURES = {
-			"urn:xmpp:chat-markers:0",
-			"urn:xmpp:receipts"
-	};
-	protected static final String IDENTITY_TYPE = "phone";
 
 	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
 
-	public static String getCapHash() {
-		StringBuilder s = new StringBuilder();
-		s.append("client/" + IDENTITY_TYPE + "//" + ConversationsPlusApplication.getNameAndVersion() + "<");
-		MessageDigest md;
-		try {
-			md = MessageDigest.getInstance("SHA-1");
-		} catch (NoSuchAlgorithmException e) {
-			return null;
-		}
-
-		for (String feature : getFeatures()) {
-			s.append(feature + "<");
-		}
-		byte[] sha1 = md.digest(s.toString().getBytes());
-		return new String(Base64.encode(sha1, Base64.DEFAULT));
-	}
-
 	public static String getTimestamp(long time) {
 		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
 		return DATE_FORMAT.format(time);
 	}
-
-	public static List<String> getFeatures() {
-		ArrayList<String> features = new ArrayList<>();
-		features.addAll(Arrays.asList(FEATURES));
-		if (Settings.CONFIRM_MESSAGE_RECEIVED) {
-			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
-		}
-		Collections.sort(features);
-		return features;
-	}
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java b/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
index aa279e40..88652b39 100644
--- a/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
@@ -15,12 +15,11 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
-import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.Config;
 import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Conversation;
-import de.thedevstack.conversationsplus.services.MessageArchiveService;
+import de.thedevstack.conversationsplus.services.mam.MessageArchiveService;
 import de.thedevstack.conversationsplus.utils.Xmlns;
 import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.forms.Data;
@@ -30,23 +29,6 @@ import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
 
 public class IqGenerator extends AbstractGenerator {
 
-	public IqPacket discoResponse(final IqPacket request) {
-		final IqPacket packet = new IqPacket(IqPacket.TYPE.RESULT);
-		packet.setId(request.getId());
-		packet.setTo(request.getFrom());
-		final Element query = packet.addChild("query",
-				"http://jabber.org/protocol/disco#info");
-		query.setAttribute("node", request.query().getAttribute("node"));
-		final Element identity = query.addChild("identity");
-		identity.setAttribute("category", "client");
-		identity.setAttribute("type", IDENTITY_TYPE);
-		identity.setAttribute("name", ConversationsPlusApplication.getNameAndVersion());
-		for (final String feature : getFeatures()) {
-			query.addChild("feature").setAttribute("var", feature);
-		}
-		return packet;
-	}
-
 	protected IqPacket publish(final String node, final Element item) {
 		final IqPacket packet = new IqPacket(IqPacket.TYPE.SET);
 		final Element pubsub = packet.addChild("pubsub",
diff --git a/src/main/java/de/thedevstack/conversationsplus/generator/MessageGenerator.java b/src/main/java/de/thedevstack/conversationsplus/generator/MessageGenerator.java
index e76d25f6..2e580f09 100644
--- a/src/main/java/de/thedevstack/conversationsplus/generator/MessageGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/generator/MessageGenerator.java
@@ -20,6 +20,7 @@ import de.thedevstack.conversationsplus.xmpp.carbons.Carbons;
 import de.thedevstack.conversationsplus.xmpp.chatstate.ChatState;
 import de.thedevstack.conversationsplus.xmpp.httpuploadim.HttpUploadHint;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.openpgp.OpenPgpXep;
 import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
 
 public class MessageGenerator extends AbstractGenerator {
@@ -128,9 +129,9 @@ public class MessageGenerator extends AbstractGenerator {
 		MessagePacket packet = preparePacket(message);
 		packet.setBody("This is an XEP-0027 encrypted message");
 		if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
-			packet.addChild("x", "jabber:x:encrypted").setContent(message.getEncryptedBody());
+			packet.addChild(OpenPgpXep.ENCRYPTED_ELEMENT, OpenPgpXep.ENCRYPTED_NAMESPACE).setContent(message.getEncryptedBody());
 		} else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
-			packet.addChild("x", "jabber:x:encrypted").setContent(message.getBody());
+			packet.addChild(OpenPgpXep.ENCRYPTED_ELEMENT, OpenPgpXep.ENCRYPTED_NAMESPACE).setContent(message.getBody());
 		}
 		return packet;
 	}
diff --git a/src/main/java/de/thedevstack/conversationsplus/generator/PresenceGenerator.java b/src/main/java/de/thedevstack/conversationsplus/generator/PresenceGenerator.java
index fbe7c911..bfede624 100644
--- a/src/main/java/de/thedevstack/conversationsplus/generator/PresenceGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/generator/PresenceGenerator.java
@@ -5,7 +5,9 @@ import de.thedevstack.conversationsplus.entities.Contact;
 import de.thedevstack.conversationsplus.entities.MucOptions;
 import de.thedevstack.conversationsplus.entities.Presence;
 import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.disco.FeatureRegistry;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.openpgp.OpenPgpXep;
 import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
 
 public class PresenceGenerator extends AbstractGenerator {
@@ -54,9 +56,9 @@ public class PresenceGenerator extends AbstractGenerator {
 		packet.setFrom(account.getJid());
 		String sig = account.getPgpSignature();
 		if (sig != null) {
-			packet.addChild("x", "jabber:x:signed").setContent(sig);
+			packet.addChild(OpenPgpXep.SIGNED_ELEMENT, OpenPgpXep.SIGNED_NAMESPACE).setContent(sig);
 		}
-		String capHash = getCapHash();
+		String capHash = FeatureRegistry.getCapHash();
 		if (capHash != null) {
 			Element cap = packet.addChild("c",
 					"http://jabber.org/protocol/caps");
@@ -97,7 +99,7 @@ public class PresenceGenerator extends AbstractGenerator {
         }
         String sig = account.getPgpSignature();
         if (sig != null) {
-            packet.addChild("x", "jabber:x:signed").setContent(sig);
+            packet.addChild(OpenPgpXep.SIGNED_ELEMENT, OpenPgpXep.SIGNED_NAMESPACE).setContent(sig);
         }
 
         return packet;
@@ -109,7 +111,7 @@ public class PresenceGenerator extends AbstractGenerator {
         String sig = account.getPgpSignature();
         if (sig != null) {
             packet.addChild("status").setContent("online");
-            packet.addChild("x", "jabber:x:signed").setContent(sig);
+            packet.addChild(OpenPgpXep.SIGNED_ELEMENT, OpenPgpXep.SIGNED_NAMESPACE).setContent(sig);
         }
 
         return packet;
diff --git a/src/main/java/de/thedevstack/conversationsplus/parser/IqParser.java b/src/main/java/de/thedevstack/conversationsplus/parser/IqParser.java
index 35b41d61..b3cfc813 100644
--- a/src/main/java/de/thedevstack/conversationsplus/parser/IqParser.java
+++ b/src/main/java/de/thedevstack/conversationsplus/parser/IqParser.java
@@ -28,19 +28,14 @@ import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Contact;
 import de.thedevstack.conversationsplus.services.avatar.AvatarCache;
-import de.thedevstack.conversationsplus.services.avatar.AvatarService;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
 import de.thedevstack.conversationsplus.utils.Xmlns;
-import de.thedevstack.conversationsplus.utils.XmppSendUtil;
 import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
 import de.thedevstack.conversationsplus.xmpp.OnUpdateBlocklist;
-import de.thedevstack.conversationsplus.xmpp.iqversion.IqVersionPacket;
-import de.thedevstack.conversationsplus.xmpp.iqversion.IqVersionPacketGenerator;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
-import de.thedevstack.conversationsplus.xmpp.time.TimePacket;
-import de.thedevstack.conversationsplus.xmpp.time.TimePacketGenerator;
 
 public class IqParser extends AbstractParser implements OnIqPacketReceived {
 
@@ -300,7 +295,7 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 				account.getBlocklist().addAll(jids);
 			}
 			// Update the UI
-			mXmppConnectionService.updateBlocklistUi(OnUpdateBlocklist.Status.BLOCKED);
+			UiUpdateHelper.updateBlocklistUi(OnUpdateBlocklist.Status.BLOCKED);
 		} else if (packet.hasChild("unblock", Xmlns.BLOCKING) &&
 				packet.fromServer(account) && packet.getType() == IqPacket.TYPE.SET) {
 			Logging.d(Config.LOGTAG, "Received unblock update from server");
@@ -320,21 +315,11 @@ public class IqParser extends AbstractParser implements OnIqPacketReceived {
 				}
 				account.getBlocklist().removeAll(jids);
 			}
-			mXmppConnectionService.updateBlocklistUi(OnUpdateBlocklist.Status.UNBLOCKED);
+			UiUpdateHelper.updateBlocklistUi(OnUpdateBlocklist.Status.UNBLOCKED);
 		} else if (packet.hasChild("open", "http://jabber.org/protocol/ibb")
 				|| packet.hasChild("data", "http://jabber.org/protocol/ibb")) {
 			mXmppConnectionService.getJingleConnectionManager()
 				.deliverIbbPacket(account, packet);
-		} else if (packet.hasChild("query", "http://jabber.org/protocol/disco#info")) {
-			final IqPacket response = mXmppConnectionService.getIqGenerator().discoResponse(packet);
-			mXmppConnectionService.sendIqPacket(account, response, null);
-		} else if (packet.hasChild("query", IqVersionPacket.NAMESPACE)) {
-			XmppSendUtil.sendIqPacket(account, IqVersionPacketGenerator.generateResponse(packet), null);
-		} else if (packet.hasChild("ping", "urn:xmpp:ping")) {
-			final IqPacket response = packet.generateResponse(IqPacket.TYPE.RESULT);
-			mXmppConnectionService.sendIqPacket(account, response, null);
-		} else if (packet.hasChild("time", TimePacket.NAMESPACE)) {
-            XmppSendUtil.sendIqPacket(account, TimePacketGenerator.generateResponse(packet), null);
 		} else {
 			if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
 				final IqPacket response = packet.generateResponse(IqPacket.TYPE.ERROR);
diff --git a/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java b/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
index 52d35f58..4cc6f8b2 100644
--- a/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
+++ b/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
@@ -17,6 +17,8 @@ import de.thedevstack.conversationsplus.xmpp.avatar.AvatarPacketParser;
 import de.thedevstack.conversationsplus.xmpp.carbons.Carbons;
 import de.thedevstack.conversationsplus.xmpp.httpuploadim.HttpUploadHint;
 import de.thedevstack.conversationsplus.xmpp.mam.Mam;
+import de.thedevstack.conversationsplus.xmpp.openpgp.OpenPgpXep;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketReceiver;
 import de.tzur.conversations.Settings;
 
 import net.java.otr4j.session.Session;
@@ -40,7 +42,7 @@ import de.thedevstack.conversationsplus.entities.Conversation;
 import de.thedevstack.conversationsplus.entities.Message;
 import de.thedevstack.conversationsplus.entities.MucOptions;
 import de.thedevstack.conversationsplus.services.avatar.AvatarService;
-import de.thedevstack.conversationsplus.services.MessageArchiveService;
+import de.thedevstack.conversationsplus.services.mam.MessageArchiveService;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
 import de.thedevstack.conversationsplus.utils.CryptoHelper;
 import de.thedevstack.conversationsplus.xml.Element;
@@ -231,7 +233,7 @@ public class MessageParser extends AbstractParser implements
 		} else if (ConversationsPlusPreferences.omemoEnabled() && AxolotlService.PEP_DEVICE_LIST.equals(node)) {
 			Log.d(Config.LOGTAG, AxolotlServiceImpl.getLogprefix(account)+"Received PEP device list update from "+ from + ", processing...");
 			Element item = items.findChild("item");
-			Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
+			Set<Integer> deviceIds = IqPacketReceiver.getInstance().getLegacyIqParser().deviceIds(item);
 			AxolotlService axolotlService = account.getAxolotlService();
 			axolotlService.registerDevices(from, deviceIds);
 			UiUpdateHelper.updateAccountUi();
@@ -313,7 +315,7 @@ public class MessageParser extends AbstractParser implements
 		}
 		final String body = packet.getBody();
 		final Element mucUserElement = packet.findChild("x", "http://jabber.org/protocol/muc#user");
-		final String pgpEncrypted = packet.findChildContent("x", "jabber:x:encrypted");
+		final String pgpEncrypted = packet.findChildContent(OpenPgpXep.ENCRYPTED_ELEMENT, OpenPgpXep.ENCRYPTED_NAMESPACE);
 		final Element oob = packet.findChild("x", "jabber:x:oob");
 		final boolean isOob = oob!= null && body != null && body.equals(oob.findChildContent("url"));
 		final Element axolotlEncrypted = packet.findChild(XmppAxolotlMessage.CONTAINERTAG, AxolotlService.PEP_PREFIX);
diff --git a/src/main/java/de/thedevstack/conversationsplus/parser/PresenceParser.java b/src/main/java/de/thedevstack/conversationsplus/parser/PresenceParser.java
index 5270eefe..ed366a2c 100644
--- a/src/main/java/de/thedevstack/conversationsplus/parser/PresenceParser.java
+++ b/src/main/java/de/thedevstack/conversationsplus/parser/PresenceParser.java
@@ -28,6 +28,7 @@ import de.thedevstack.conversationsplus.xmpp.OnPresencePacketReceived;
 import de.thedevstack.conversationsplus.xmpp.avatar.AvatarVcardParser;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
 import de.thedevstack.conversationsplus.dto.Avatar;
+import de.thedevstack.conversationsplus.xmpp.openpgp.OpenPgpXep;
 import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
 
 public class PresenceParser extends AbstractParser implements
@@ -91,7 +92,7 @@ public class PresenceParser extends AbstractParser implements
 							mucOptions.addUser(user);
 						}
 						if (mXmppConnectionService.getPgpEngine() != null) {
-							Element signed = packet.findChild("x", "jabber:x:signed");
+							Element signed = packet.findChild(OpenPgpXep.SIGNED_ELEMENT, OpenPgpXep.SIGNED_NAMESPACE);
 							if (signed != null) {
 								Element status = packet.findChild("status");
 								String msg = status == null ? "" : status.getContent();
@@ -213,7 +214,7 @@ public class PresenceParser extends AbstractParser implements
 			}
 
 			PgpEngine pgp = mXmppConnectionService.getPgpEngine();
-			Element x = packet.findChild("x", "jabber:x:signed");
+			Element x = packet.findChild(OpenPgpXep.SIGNED_ELEMENT, OpenPgpXep.SIGNED_NAMESPACE);
 			if (pgp != null && x != null) {
 				Element status = packet.findChild("status");
 				String msg = status != null ? status.getContent() : "";
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java b/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
index ac6ef464..963adfe4 100644
--- a/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
+++ b/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
@@ -58,13 +58,28 @@ import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.services.avatar.AvatarCache;
 import de.thedevstack.conversationsplus.services.avatar.AvatarService;
 import de.thedevstack.conversationsplus.services.filetransfer.FileTransferManager;
+import de.thedevstack.conversationsplus.services.mam.MessageArchiveService;
+import de.thedevstack.conversationsplus.services.mam.OnMoreMessagesLoaded;
+import de.thedevstack.conversationsplus.services.muc.OnConferenceConfigurationFetched;
+import de.thedevstack.conversationsplus.services.muc.OnConferenceJoined;
+import de.thedevstack.conversationsplus.services.muc.listener.ConferenceConfigurationFetched;
 import de.thedevstack.conversationsplus.utils.AccountUtil;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
 import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
 import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
 import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.services.muc.listener.ConferenceServiceDiscoveryReceived;
+import de.thedevstack.conversationsplus.xmpp.XepRegistry;
+import de.thedevstack.conversationsplus.xmpp.disco.ServiceDiscoveryIqPacketGenerator;
+import de.thedevstack.conversationsplus.xmpp.disco.ServiceDiscoveryIqPacketParser;
+import de.thedevstack.conversationsplus.xmpp.disco.ServiceDiscoveryXep;
+import de.thedevstack.conversationsplus.xmpp.iqversion.SoftwareVersionXep;
 import de.thedevstack.conversationsplus.xmpp.mam.Mam;
+import de.thedevstack.conversationsplus.xmpp.openpgp.OpenPgpXep;
+import de.thedevstack.conversationsplus.xmpp.ping.PingXep;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketReceiver;
+import de.thedevstack.conversationsplus.xmpp.time.EntityTimeXep;
 import de.tzur.conversations.Settings;
 import de.thedevstack.conversationsplus.Config;
 import de.thedevstack.conversationsplus.R;
@@ -87,7 +102,6 @@ import de.thedevstack.conversationsplus.entities.TransferablePlaceholder;
 import de.thedevstack.conversationsplus.generator.IqGenerator;
 import de.thedevstack.conversationsplus.generator.MessageGenerator;
 import de.thedevstack.conversationsplus.generator.PresenceGenerator;
-import de.thedevstack.conversationsplus.parser.IqParser;
 import de.thedevstack.conversationsplus.parser.MessageParser;
 import de.thedevstack.conversationsplus.parser.PresenceParser;
 import de.thedevstack.conversationsplus.persistance.DatabaseBackend;
@@ -150,7 +164,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			this);
 	private OnMessagePacketReceived mMessageParser = new MessageParser(this);
 	private OnPresencePacketReceived mPresenceParser = new PresenceParser(this);
-	private IqParser mIqParser = new IqParser(this);
+
 	private OnIqPacketReceived mDefaultIqHandler = new OnIqPacketReceived() {
 		@Override
 		public void onIqPacketReceived(Account account, IqPacket packet) {
@@ -695,11 +709,20 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 
 	public XmppConnection createConnection(final Account account) {
 		account.setResource(ConversationsPlusPreferences.resource().toLowerCase(Locale.getDefault()));
+
+        // TODO Find better place for initialization
+        IqPacketReceiver iqPacketReceiver = IqPacketReceiver.getInstance();
+        XepRegistry.add(new EntityTimeXep(ConversationsPlusPreferences.sendEntityTime()));
+        XepRegistry.add(new SoftwareVersionXep(ConversationsPlusPreferences.sendSoftwareVersion()));
+        XepRegistry.add(new ServiceDiscoveryXep());
+        XepRegistry.add(new PingXep());
+        XepRegistry.add(new OpenPgpXep());
+
 		final XmppConnection connection = new XmppConnection(account, this);
 		connection.setOnMessagePacketReceivedListener(this.mMessageParser);
 		connection.setOnStatusChangedListener(this.statusListener);
 		connection.setOnPresencePacketReceivedListener(this.mPresenceParser);
-		connection.setOnUnregisteredIqPacketReceivedListener(this.mIqParser);
+		connection.setOnUnregisteredIqPacketReceivedListener(iqPacketReceiver);
 		connection.setOnJinglePacketReceivedListener(this.jingleListener);
 		connection.setOnBindListener(this.mOnBindListener);
 		connection.setOnMessageAcknowledgeListener(this.mOnMessageAcknowledgedListener);
@@ -875,7 +898,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	private void sendUnsentMessages(final Conversation conversation) {
+	public void sendUnsentMessages(final Conversation conversation) {
 		conversation.findWaitingMessages(new Conversation.OnMessageFound() {
 
 			@Override
@@ -898,7 +921,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			Logging.d(Config.LOGTAG, account.getJid().toBareJid() + ": fetching roster");
 		}
 		iqPacket.query(Xmlns.ROSTER).setAttribute("ver", account.getRosterVersion());
-		sendIqPacket(account, iqPacket, mIqParser);
+		XmppSendUtil.sendIqPacket(account, iqPacket, IqPacketReceiver.getInstance().getLegacyIqParser()); //TODO -> replace with RosterIqHandler
 	}
 
 	public void fetchBookmarks(final Account account) {
@@ -1657,44 +1680,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		if (account.getStatus() == Account.State.ONLINE) {
 			conversation.resetMucOptions();
 			conversation.setHasMessagesLeftOnServer(false);
-			fetchConferenceConfiguration(conversation, new OnConferenceConfigurationFetched() {
-
-				private void join(Conversation conversation) {
-					Account account = conversation.getAccount();
-					final MucOptions mucOptions = conversation.getMucOptions();
-					final Jid joinJid = mucOptions.getSelf().getFullJid();
-					Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": joining conversation " + joinJid.toString());
-                    long lastMessageTransmitted = conversation.getLastMessageTransmitted();
-                    PresencePacket packet = PresenceGenerator.generateMucJoin(account, joinJid, mucOptions, lastMessageTransmitted);
-					XmppSendUtil.sendPresencePacket(account, packet);
-					if (onConferenceJoined != null) {
-						onConferenceJoined.onConferenceJoined(conversation);
-					}
-					if (!joinJid.equals(conversation.getJid())) {
-						conversation.setContactJid(joinJid);
-						databaseBackend.updateConversation(conversation);
-					}
-
-					if (mucOptions.mamSupport()) {
-						getMessageArchiveService().catchupMUC(conversation);
-					}
-					if (mucOptions.membersOnly() && mucOptions.nonanonymous()) {
-						fetchConferenceMembers(conversation);
-					}
-					sendUnsentMessages(conversation);
-				}
-
-				@Override
-				public void onConferenceConfigurationFetched(Conversation conversation) {
-					join(conversation);
-				}
-
-				@Override
-				public void onFetchFailed(final Conversation conversation, Element error) {
-					join(conversation);
-					fetchConferenceConfiguration(conversation);
-				}
-			});
+			fetchConferenceConfiguration(conversation, new ConferenceConfigurationFetched(onConferenceJoined));
 			updateConversationUi();
 		} else {
 			account.pendingConferenceJoins.add(conversation);
@@ -1704,37 +1690,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	private void fetchConferenceMembers(final Conversation conversation) {
-		final Account account = conversation.getAccount();
-		final String[] affiliations = {"member","admin","owner"};
-		OnIqPacketReceived callback = new OnIqPacketReceived() {
-
-			private int i = 0;
-
-			@Override
-			public void onIqPacketReceived(Account account, IqPacket packet) {
-				Element query = packet.query("http://jabber.org/protocol/muc#admin");
-				if (packet.getType() == IqPacket.TYPE.RESULT && query != null) {
-					for(Element child : query.getChildren()) {
-						if ("item".equals(child.getName())) {
-							conversation.getMucOptions().putMember(child.getAttributeAsJid("jid"));
-						}
-					}
-				} else {
-					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": could not request affiliation "+affiliations[i]+" in "+conversation.getJid().toBareJid());
-				}
-				++i;
-				if (i >= affiliations.length) {
-					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": retrieved members for "+conversation.getJid().toBareJid()+": "+conversation.getMucOptions().getMembers());
-				}
-			}
-		};
-		for(String affiliation : affiliations) {
-			sendIqPacket(account, mIqGenerator.queryAffiliation(conversation, affiliation), callback);
-		}
-		Log.d(Config.LOGTAG,account.getJid().toBareJid()+": fetching members for "+conversation.getName());
-	}
-
 	public void providePasswordForMuc(Conversation conversation, String password) {
 		if (conversation.getMode() == Conversation.MODE_MULTI) {
 			conversation.getMucOptions().setPassword(password);
@@ -1889,40 +1844,8 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	}
 
 	public void fetchConferenceConfiguration(final Conversation conversation, final OnConferenceConfigurationFetched callback) {
-		IqPacket request = new IqPacket(IqPacket.TYPE.GET);
-		request.setTo(conversation.getJid().toBareJid());
-		request.query("http://jabber.org/protocol/disco#info");
-		sendIqPacket(conversation.getAccount(), request, new OnIqPacketReceived() {
-			@Override
-			public void onIqPacketReceived(Account account, IqPacket packet) {
-				Element query = packet.findChild("query","http://jabber.org/protocol/disco#info");
-				if (packet.getType() == IqPacket.TYPE.RESULT && query != null) {
-					ArrayList<String> features = new ArrayList<>();
-					for (Element child : query.getChildren()) {
-						if (child != null && child.getName().equals("feature")) {
-							String var = child.getAttribute("var");
-							if (var != null) {
-								features.add(var);
-							}
-						}
-					}
-					Element form = query.findChild("x", "jabber:x:data");
-					if (form != null) {
-						conversation.getMucOptions().updateFormData(Data.parse(form));
-					}
-					conversation.getMucOptions().updateFeatures(features);
-					if (callback != null) {
-						callback.onConferenceConfigurationFetched(conversation);
-					}
-					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": fetched muc configuration for " + conversation.getJid().toBareJid() + " - " + features.toString());
-					updateConversationUi();
-				} else if (packet.getType() == IqPacket.TYPE.ERROR) {
-					if (callback != null) {
-						callback.onFetchFailed(conversation, packet.getError());
-					}
-				}
-			}
-		});
+        IqPacket request = ServiceDiscoveryIqPacketGenerator.generateRequest(conversation.getJid().toBareJid());
+		XmppSendUtil.sendIqPacket(conversation.getAccount(), request, new ConferenceServiceDiscoveryReceived(conversation, callback));
 	}
 
 	public void pushConferenceConfiguration(final Conversation conversation, final Bundle options, final OnConferenceOptionsPushed callback) {
@@ -2466,10 +2389,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		return this.mIqGenerator;
 	}
 
-	public IqParser getIqParser() {
-		return this.mIqParser;
-	}
-
 	public JingleConnectionManager getJingleConnectionManager() {
 		return this.mJingleConnectionManager;
 	}
@@ -2529,7 +2448,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				public void onIqPacketReceived(final Account account, final IqPacket packet) {
 					if (packet.getType() == IqPacket.TYPE.RESULT) {
 						account.getBlocklist().add(jid);
-						updateBlocklistUi(OnUpdateBlocklist.Status.BLOCKED);
+						UiUpdateHelper.updateBlocklistUi(OnUpdateBlocklist.Status.BLOCKED);
 					}
 				}
 			});
@@ -2544,7 +2463,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				public void onIqPacketReceived(final Account account, final IqPacket packet) {
 					if (packet.getType() == IqPacket.TYPE.RESULT) {
 						account.getBlocklist().remove(jid);
-						updateBlocklistUi(OnUpdateBlocklist.Status.UNBLOCKED);
+                        UiUpdateHelper.updateBlocklistUi(OnUpdateBlocklist.Status.UNBLOCKED);
 					}
 				}
 			});
@@ -2587,15 +2506,13 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		} else {
 			if (!account.inProgressDiscoFetches.contains(key)) {
 				account.inProgressDiscoFetches.add(key);
-				IqPacket request = new IqPacket(IqPacket.TYPE.GET);
-				request.setTo(jid);
-				request.query("http://jabber.org/protocol/disco#info");
+				IqPacket request = ServiceDiscoveryIqPacketGenerator.generateRequest(jid);
 				Log.d(Config.LOGTAG,account.getJid().toBareJid()+": making disco request for "+key.second+" to "+jid);
 				sendIqPacket(account, request, new OnIqPacketReceived() {
 					@Override
 					public void onIqPacketReceived(Account account, IqPacket discoPacket) {
-						if (discoPacket.getType() == IqPacket.TYPE.RESULT) {
-							ServiceDiscoveryResult disco = new ServiceDiscoveryResult(discoPacket);
+                        ServiceDiscoveryResult disco = ServiceDiscoveryIqPacketParser.parse(discoPacket);
+                        if (null != disco) {
 							if (presence.getVer().equals(disco.getVer())) {
 								databaseBackend.insertDiscoveryResult(disco);
 								injectServiceDiscorveryResult(account.getRoster(), presence.getHash(), presence.getVer(), disco);
@@ -2657,15 +2574,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		void informUser(int r);
 	}
 
-	public interface OnMoreMessagesLoaded {
-		void onMoreMessagesLoaded(int count, Conversation conversation);
-
-		void informUser(int r);
-
-        void setLoadingInProgress();
 
-        boolean isLoadingInProgress();
-	}
 
 	public interface OnAccountPasswordChanged {
 		void onPasswordChangeSucceeded();
@@ -2694,10 +2603,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	}
 
 	public interface OnCaptchaRequested {
-		void onCaptchaRequested(Account account,
-								String id,
-								Data data,
-								Bitmap captcha);
+		void onCaptchaRequested(Account account, String id, Data data, Bitmap captcha);
 	}
 
 	public interface OnRosterUpdate {
@@ -2708,16 +2614,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		void onMucRosterUpdate();
 	}
 
-	public interface OnConferenceConfigurationFetched {
-		void onConferenceConfigurationFetched(Conversation conversation);
-
-		void onFetchFailed(Conversation conversation, Element error);
-	}
-
-	public interface OnConferenceJoined {
-		void onConferenceJoined(Conversation conversation);
-	}
-
 	public interface OnConferenceOptionsPushed {
 		void onPushSucceeded();
 
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java b/src/main/java/de/thedevstack/conversationsplus/services/mam/MessageArchiveService.java
index 6402f4ed..6ad413b4 100644
--- a/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java
+++ b/src/main/java/de/thedevstack/conversationsplus/services/mam/MessageArchiveService.java
@@ -1,4 +1,4 @@
-package de.thedevstack.conversationsplus.services;
+package de.thedevstack.conversationsplus.services.mam;
 
 import android.util.Pair;
 
@@ -15,6 +15,7 @@ import de.thedevstack.conversationsplus.R;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Conversation;
 import de.thedevstack.conversationsplus.generator.AbstractGenerator;
+import de.thedevstack.conversationsplus.services.XmppConnectionService;
 import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.OnAdvancedStreamFeaturesLoaded;
 import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
@@ -101,7 +102,7 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
        return this.query(conversation, start, end, null);
     }
 
-    public Query query(Conversation conversation, long start, long end, XmppConnectionService.OnMoreMessagesLoaded callback) {
+    public Query query(Conversation conversation, long start, long end, OnMoreMessagesLoaded callback) {
         synchronized (this.queries) {
             if (start > end) {
                 return null;
@@ -186,7 +187,7 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 		}
 	}
 
-	public boolean queryInProgress(Conversation conversation, XmppConnectionService.OnMoreMessagesLoaded callback) {
+	public boolean queryInProgress(Conversation conversation, OnMoreMessagesLoaded callback) {
 		synchronized (this.queries) {
 			for(Query query : queries) {
 				if (query.conversation == conversation) {
@@ -274,7 +275,7 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 		private Account account;
 		private Conversation conversation;
 		private PagingOrder pagingOrder = PagingOrder.NORMAL;
-		private XmppConnectionService.OnMoreMessagesLoaded callback = null;
+		private OnMoreMessagesLoaded callback = null;
 
 
 		public Query(Conversation conversation, long start, long end) {
@@ -339,7 +340,7 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 			return start;
 		}
 
-		public void setCallback(XmppConnectionService.OnMoreMessagesLoaded callback) {
+		public void setCallback(OnMoreMessagesLoaded callback) {
 			this.callback = callback;
 		}
 
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/mam/OnMoreMessagesLoaded.java b/src/main/java/de/thedevstack/conversationsplus/services/mam/OnMoreMessagesLoaded.java
new file mode 100644
index 00000000..72e4b516
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/mam/OnMoreMessagesLoaded.java
@@ -0,0 +1,13 @@
+package de.thedevstack.conversationsplus.services.mam;
+
+import de.thedevstack.conversationsplus.entities.Conversation;
+
+public interface OnMoreMessagesLoaded {
+    void onMoreMessagesLoaded(int count, Conversation conversation);
+
+    void informUser(int r);
+
+    void setLoadingInProgress();
+
+    boolean isLoadingInProgress();
+}
\ No newline at end of file
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceConfigurationFetched.java b/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceConfigurationFetched.java
new file mode 100644
index 00000000..7e7222fd
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceConfigurationFetched.java
@@ -0,0 +1,10 @@
+package de.thedevstack.conversationsplus.services.muc;
+
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.xml.Element;
+
+public interface OnConferenceConfigurationFetched {
+	void onConferenceConfigurationFetched(Conversation conversation);
+
+	void onFetchFailed(Conversation conversation, Element error);
+}
\ No newline at end of file
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceJoined.java b/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceJoined.java
new file mode 100644
index 00000000..5e9a0af5
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/muc/OnConferenceJoined.java
@@ -0,0 +1,7 @@
+package de.thedevstack.conversationsplus.services.muc;
+
+import de.thedevstack.conversationsplus.entities.Conversation;
+
+public interface OnConferenceJoined {
+    void onConferenceJoined(Conversation conversation);
+}
\ No newline at end of file
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceConfigurationFetched.java b/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceConfigurationFetched.java
new file mode 100644
index 00000000..a386db88
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceConfigurationFetched.java
@@ -0,0 +1,96 @@
+package de.thedevstack.conversationsplus.services.muc.listener;
+
+import android.util.Log;
+
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.entities.MucOptions;
+import de.thedevstack.conversationsplus.generator.PresenceGenerator;
+import de.thedevstack.conversationsplus.persistance.DatabaseBackend;
+import de.thedevstack.conversationsplus.services.muc.OnConferenceConfigurationFetched;
+import de.thedevstack.conversationsplus.services.muc.OnConferenceJoined;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
+
+/**
+ */
+public class ConferenceConfigurationFetched implements OnConferenceConfigurationFetched {
+    private OnConferenceJoined onConferenceJoined;
+
+    public ConferenceConfigurationFetched(OnConferenceJoined onConferenceJoined) {
+        this.onConferenceJoined = onConferenceJoined;
+    }
+
+    private void join(Conversation conversation) {
+        Account account = conversation.getAccount();
+        final MucOptions mucOptions = conversation.getMucOptions();
+        final Jid joinJid = mucOptions.getSelf().getFullJid();
+        Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": joining conversation " + joinJid.toString());
+        long lastMessageTransmitted = conversation.getLastMessageTransmitted();
+        PresencePacket packet = PresenceGenerator.generateMucJoin(account, joinJid, mucOptions, lastMessageTransmitted);
+        XmppSendUtil.sendPresencePacket(account, packet);
+        if (onConferenceJoined != null) {
+            onConferenceJoined.onConferenceJoined(conversation);
+        }
+        if (!joinJid.equals(conversation.getJid())) {
+            conversation.setContactJid(joinJid);
+            DatabaseBackend.getInstance().updateConversation(conversation);
+        }
+
+        if (mucOptions.mamSupport()) {
+            XmppConnectionServiceAccessor.xmppConnectionService.getMessageArchiveService().catchupMUC(conversation);
+        }
+        if (mucOptions.membersOnly() && mucOptions.nonanonymous()) {
+            fetchConferenceMembers(conversation);
+        }
+        XmppConnectionServiceAccessor.xmppConnectionService.sendUnsentMessages(conversation);
+    }
+
+    @Override
+    public void onConferenceConfigurationFetched(Conversation conversation) {
+        join(conversation);
+    }
+
+    @Override
+    public void onFetchFailed(final Conversation conversation, Element error) {
+        join(conversation);
+        XmppConnectionServiceAccessor.xmppConnectionService.fetchConferenceConfiguration(conversation);
+    }
+
+    private void fetchConferenceMembers(final Conversation conversation) {
+        final Account account = conversation.getAccount();
+        final String[] affiliations = {"member","admin","owner"};
+        OnIqPacketReceived callback = new OnIqPacketReceived() {
+
+            private int i = 0;
+
+            @Override
+            public void onIqPacketReceived(Account account, IqPacket packet) {
+                Element query = packet.query("http://jabber.org/protocol/muc#admin");
+                if (packet.getType() == IqPacket.TYPE.RESULT && query != null) {
+                    for(Element child : query.getChildren()) {
+                        if ("item".equals(child.getName())) {
+                            conversation.getMucOptions().putMember(child.getAttributeAsJid("jid"));
+                        }
+                    }
+                } else {
+                    Log.d(Config.LOGTAG,account.getJid().toBareJid()+": could not request affiliation "+affiliations[i]+" in "+conversation.getJid().toBareJid());
+                }
+                ++i;
+                if (i >= affiliations.length) {
+                    Log.d(Config.LOGTAG,account.getJid().toBareJid()+": retrieved members for "+conversation.getJid().toBareJid()+": "+conversation.getMucOptions().getMembers());
+                }
+            }
+        };
+        for(String affiliation : affiliations) {
+            XmppSendUtil.sendIqPacket(account, XmppConnectionServiceAccessor.xmppConnectionService.getIqGenerator().queryAffiliation(conversation, affiliation), callback);
+        }
+        Log.d(Config.LOGTAG,account.getJid().toBareJid()+": fetching members for "+conversation.getName());
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceServiceDiscoveryReceived.java b/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceServiceDiscoveryReceived.java
new file mode 100644
index 00000000..5d1b8c8d
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/muc/listener/ConferenceServiceDiscoveryReceived.java
@@ -0,0 +1,59 @@
+package de.thedevstack.conversationsplus.services.muc.listener;
+
+import android.util.Log;
+
+import java.util.ArrayList;
+
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.services.muc.OnConferenceConfigurationFetched;
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
+import de.thedevstack.conversationsplus.xmpp.disco.ServiceDiscovery;
+import de.thedevstack.conversationsplus.xmpp.forms.Data;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ */
+public class ConferenceServiceDiscoveryReceived implements OnIqPacketReceived {
+    private Conversation conversation;
+    private OnConferenceConfigurationFetched callback;
+
+    public ConferenceServiceDiscoveryReceived(Conversation conversation, OnConferenceConfigurationFetched callback) {
+        this.conversation = conversation;
+        this.callback = callback;
+    }
+
+    @Override
+    public void onIqPacketReceived(Account account, IqPacket packet) {
+        Element query = packet.findChild(ServiceDiscovery.ELEMENT, ServiceDiscovery.NAMESPACE);
+        if (packet.getType() == IqPacket.TYPE.RESULT && query != null) {
+            ArrayList<String> features = new ArrayList<>();
+            for (Element child : query.getChildren()) {
+                if (child != null && child.getName().equals("feature")) {
+                    String var = child.getAttribute("var");
+                    if (var != null) {
+                        features.add(var);
+                    }
+                }
+            }
+            Element form = query.findChild("x", "jabber:x:data");
+            if (form != null) {
+                conversation.getMucOptions().updateFormData(Data.parse(form));
+            }
+            conversation.getMucOptions().updateFeatures(features);
+            if (callback != null) {
+                callback.onConferenceConfigurationFetched(conversation);
+            }
+            Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": fetched muc configuration for " + conversation.getJid().toBareJid() + " - " + features.toString());
+            UiUpdateHelper.updateConversationUi();
+        } else if (packet.getType() == IqPacket.TYPE.ERROR) {
+            if (callback != null) {
+                callback.onFetchFailed(conversation, packet.getError());
+            }
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java b/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
index 296f8f4f..53c3892d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
@@ -24,7 +24,9 @@ import java.util.Locale;
 
 import de.duenndns.ssl.MemorizingTrustManager;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.services.ExportLogsService;
+import de.thedevstack.conversationsplus.xmpp.XepRegistry;
 import de.tzur.conversations.Settings;
 import de.thedevstack.conversationsplus.R;
 import de.thedevstack.conversationsplus.entities.Account;
@@ -187,6 +189,18 @@ public class SettingsActivity extends XmppActivity implements
 			FileBackend.onFileTransferFolderChanged();
 		} else if ("img_transfer_folder".equals(name)) {
             FileBackend.onImageTransferFolderChanged();
+		} else if ("send_entity_time".equals(name)) {
+            if (ConversationsPlusPreferences.sendEntityTime()) {
+                XepRegistry.enable("time");
+            } else {
+                XepRegistry.disable("time");
+            }
+        } else if ("send_software_info".equals(name)) {
+            if (ConversationsPlusPreferences.sendSoftwareVersion()) {
+                XepRegistry.enable("iq-version");
+            } else {
+                XepRegistry.disable("iq-version");
+            }
         }
 
 	}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationMoreMessagesLoadedListener.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationMoreMessagesLoadedListener.java
index 8e2909ad..fd8b5782 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationMoreMessagesLoadedListener.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationMoreMessagesLoadedListener.java
@@ -11,6 +11,7 @@ import java.util.List;
 import de.thedevstack.conversationsplus.entities.Conversation;
 import de.thedevstack.conversationsplus.entities.Message;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.services.mam.OnMoreMessagesLoaded;
 import de.thedevstack.conversationsplus.ui.ConversationActivity;
 import de.thedevstack.conversationsplus.ui.ConversationFragment;
 import de.thedevstack.conversationsplus.ui.adapter.MessageAdapter;
@@ -18,7 +19,7 @@ import de.thedevstack.conversationsplus.ui.adapter.MessageAdapter;
 /**
  * This listener updates the UI when messages are loaded from the server.
  */
-public class ConversationMoreMessagesLoadedListener implements XmppConnectionService.OnMoreMessagesLoaded {
+public class ConversationMoreMessagesLoadedListener implements OnMoreMessagesLoaded {
     private SwipyRefreshLayout swipeLayout;
     private List<Message> messageList;
     private ConversationFragment fragment;
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationSwipeRefreshListener.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationSwipeRefreshListener.java
index 6dc9f4a4..d401251d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationSwipeRefreshListener.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ConversationSwipeRefreshListener.java
@@ -13,7 +13,7 @@ import de.thedevstack.conversationsplus.R;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Conversation;
 import de.thedevstack.conversationsplus.entities.Message;
-import de.thedevstack.conversationsplus.services.MessageArchiveService;
+import de.thedevstack.conversationsplus.services.mam.MessageArchiveService;
 import de.thedevstack.conversationsplus.ui.ConversationActivity;
 import de.thedevstack.conversationsplus.ui.ConversationFragment;
 import de.thedevstack.conversationsplus.ui.adapter.MessageAdapter;
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/UiUpdateHelper.java b/src/main/java/de/thedevstack/conversationsplus/utils/UiUpdateHelper.java
index 7638caad..4477f074 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/UiUpdateHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/UiUpdateHelper.java
@@ -2,6 +2,7 @@ package de.thedevstack.conversationsplus.utils;
 
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.xmpp.OnUpdateBlocklist;
 
 /**
  * Helper class to avoid passing the xmppConnectionService to everywhere just to update the UI.
@@ -49,4 +50,12 @@ public class UiUpdateHelper {
             Logging.e("UiUpdateHelper", "XMPP Connection Service not initialized. MUC Roster Ui not updated.");
         }
     }
+
+    public static void updateBlocklistUi(final OnUpdateBlocklist.Status status) {
+        if (null != UiUpdateHelper.xmppConnectionService) {
+            UiUpdateHelper.xmppConnectionService.updateBlocklistUi(status);
+        } else {
+            Logging.e("UiUpdateHelper", "XMPP Connection Service not initialized.Blocklist Ui not updated.");
+        }
+    }
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/XmppSendUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/XmppSendUtil.java
index 11d05832..67b70ef6 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/XmppSendUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/XmppSendUtil.java
@@ -8,9 +8,13 @@ import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
 import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
 
 /**
- * Created by tzur on 09.01.2016.
+ *
  */
 public class XmppSendUtil {
+    public static void sendIqPacket(Account account, IqPacket packet) {
+        sendIqPacket(account, packet, null);
+    }
+
     public static void sendIqPacket(Account account, IqPacket packet, OnIqPacketReceived callback) {
         final XmppConnection connection = account.getXmppConnection();
         if (connection != null) {
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractXep.java
new file mode 100644
index 00000000..96cbeb3e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractXep.java
@@ -0,0 +1,30 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+/**
+ */
+public abstract class AbstractXep implements Xep {
+    protected boolean enabled = true;
+
+    public AbstractXep() {
+        this(true);
+    }
+
+    public AbstractXep(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    @Override
+    public final void enable() {
+        this.enabled = true;
+    }
+
+    @Override
+    public final void disable() {
+        this.enabled = false;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketHandler.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketHandler.java
new file mode 100644
index 00000000..cfd5172e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketHandler.java
@@ -0,0 +1,12 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public interface IqPacketHandler {
+    void handleIqPacket(Account account, IqPacket packet) throws IqPacketErrorException;
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/Xep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/Xep.java
new file mode 100644
index 00000000..058f345e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/Xep.java
@@ -0,0 +1,16 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+/**
+ */
+public interface Xep {
+    boolean isEnabled();
+    void enable();
+    void disable();
+    String xepNumber();
+    String shortName();
+    String name();
+    String namespace();
+    String featureNamespace();
+    String elementName();
+    IqPacketHandler handler();
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/XepRegistry.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/XepRegistry.java
new file mode 100644
index 00000000..89174c70
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/XepRegistry.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+import java.util.Hashtable;
+
+import de.thedevstack.conversationsplus.xmpp.disco.FeatureRegistry;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketReceiver;
+
+/**
+ */
+public class XepRegistry {
+    private final Hashtable<String, Xep> xeps = new Hashtable<>();
+    private static final XepRegistry INSTANCE = new XepRegistry();
+
+    public static void enable(String shortName) {
+        if (INSTANCE.xeps.containsKey(shortName)) {
+            Xep xep = INSTANCE.xeps.get(shortName);
+            xep.enable();
+            FeatureRegistry.remove(xep);
+            IqPacketReceiver.getInstance().registerIqPacketHandler(xep);
+        }
+    }
+
+    public static void disable(String shortName) {
+        if (INSTANCE.xeps.containsKey(shortName)) {
+            Xep xep = INSTANCE.xeps.get(shortName);
+            xep.disable();
+            FeatureRegistry.remove(xep);
+            IqPacketReceiver.getInstance().unregisterIqPacketHandler(xep);
+        }
+    }
+
+    public static void add(Xep xep) {
+        INSTANCE.xeps.put(xep.shortName(), xep);
+        if (xep.isEnabled()) {
+            FeatureRegistry.add(xep);
+            IqPacketReceiver.getInstance().registerIqPacketHandler(xep);
+        }
+    }
+
+    public static void remove(Xep xep) {
+        INSTANCE.xeps.remove(xep.shortName());
+        FeatureRegistry.remove(xep);
+        IqPacketReceiver.getInstance().unregisterIqPacketHandler(xep);
+    }
+
+    public static XepRegistry getInstance() {
+        return INSTANCE;
+    }
+
+    private XepRegistry() {}
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
index 54db5346..2b366dbb 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
@@ -84,9 +84,11 @@ import de.thedevstack.conversationsplus.xmpp.mam.Mam;
 import de.thedevstack.conversationsplus.xmpp.stanzas.AbstractAcknowledgeableStanza;
 import de.thedevstack.conversationsplus.xmpp.stanzas.AbstractStanza;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketReceiver;
 import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
 import de.thedevstack.conversationsplus.xmpp.stanzas.PresencePacket;
 import de.thedevstack.conversationsplus.xmpp.stanzas.csi.ActivePacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.csi.Csi;
 import de.thedevstack.conversationsplus.xmpp.stanzas.csi.InactivePacket;
 import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.AckPacket;
 import de.thedevstack.conversationsplus.xmpp.stanzas.streammgmt.EnablePacket;
@@ -1092,7 +1094,7 @@ public class XmppConnection implements Runnable {
 		}
 		if (getFeatures().blocking() && !features.blockListRequested) {
 			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": Requesting block list");
-			this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
+			this.sendIqPacket(getIqGenerator().generateGetBlockList(), IqPacketReceiver.getInstance().getLegacyIqParser());
 		}
 		for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
 			listener.onAdvancedStreamFeaturesAvailable(account);
@@ -1509,7 +1511,7 @@ public class XmppConnection implements Runnable {
 		}
 
 		public boolean csi() {
-			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
+			return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", Csi.NAMESPACE);
 		}
 
 		public boolean pep() {
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java
new file mode 100644
index 00000000..1c266545
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/FeatureRegistry.java
@@ -0,0 +1,90 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import android.util.Base64;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
+import de.thedevstack.conversationsplus.xmpp.Xep;
+import de.thedevstack.conversationsplus.xmpp.chatstate.ChatState;
+import de.tzur.conversations.Settings;
+
+/**
+ */
+public final class FeatureRegistry {
+    public static final String IDENTITY_TYPE = "phone";
+
+    private static final String[] LEGACY_FEATURES = {
+            "urn:xmpp:jingle:1",
+            "urn:xmpp:jingle:apps:file-transfer:3",
+            "urn:xmpp:jingle:transports:s5b:1",
+            "urn:xmpp:jingle:transports:ibb:1",
+            "http://jabber.org/protocol/muc",
+            "jabber:x:conference",
+            "http://jabber.org/protocol/caps",
+            "http://jabber.org/protocol/disco#info",
+            "urn:xmpp:avatar:metadata+notify",
+            "http://jabber.org/protocol/nick+notify",
+            ChatState.NAMESPACE,
+            AxolotlService.PEP_DEVICE_LIST+"+notify"};
+    private static final String[] LEGACY_MESSAGE_CONFIRMATION_FEATURES = {
+            "urn:xmpp:chat-markers:0",
+            "urn:xmpp:receipts"
+    };
+    private final List<String> features = new ArrayList<>();
+    private static final FeatureRegistry INSTANCE = new FeatureRegistry();
+
+    public static void add(String featureNamespace) {
+        if (null != featureNamespace) {
+            INSTANCE.features.add(featureNamespace);
+        }
+    }
+
+    public static void remove(String featureNamespace) {
+        if (null != featureNamespace && INSTANCE.features.contains(featureNamespace)) {
+            INSTANCE.features.remove(featureNamespace);
+        }
+    }
+    public static void add(Xep xep) {
+        add(xep.featureNamespace());
+    }
+
+    public static void remove(Xep xep) {
+        remove(xep.featureNamespace());
+    }
+
+    public static List<String> getFeatures() {
+        Collections.sort(INSTANCE.features);
+        return INSTANCE.features;
+    }
+
+    public static String getCapHash() {
+        StringBuilder s = new StringBuilder();
+        s.append("client/" + IDENTITY_TYPE + "//" + ConversationsPlusApplication.getNameAndVersion() + "<");
+        MessageDigest md;
+        try {
+            md = MessageDigest.getInstance("SHA-1");
+        } catch (NoSuchAlgorithmException e) {
+            return null;
+        }
+
+        for (String feature : getFeatures()) {
+            s.append(feature + "<");
+        }
+        byte[] sha1 = md.digest(s.toString().getBytes());
+        return new String(Base64.encode(sha1, Base64.DEFAULT));
+    }
+
+    private FeatureRegistry() {
+        this.features.addAll(Arrays.asList(LEGACY_FEATURES));
+        if (Settings.CONFIRM_MESSAGE_RECEIVED) {
+            this.features.addAll(Arrays.asList(LEGACY_MESSAGE_CONFIRMATION_FEATURES));
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscovery.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscovery.java
new file mode 100644
index 00000000..59a4212b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscovery.java
@@ -0,0 +1,8 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+/**
+ */
+public interface ServiceDiscovery {
+    String NAMESPACE = "http://jabber.org/protocol/disco#info";
+    String ELEMENT = "query";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketGenerator.java
new file mode 100644
index 00000000..8e1fc075
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketGenerator.java
@@ -0,0 +1,38 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketGenerator;
+
+/**
+ */
+public class ServiceDiscoveryIqPacketGenerator {
+
+    public static IqPacket generateRequest(Jid jid) {
+        IqPacket request = IqPacketGenerator.generateIqGetPacket();
+        request.setTo(jid);
+        request.query(ServiceDiscovery.NAMESPACE);
+
+        return request;
+    }
+
+    public static IqPacket generateResponse(IqPacket packet) {
+        IqPacket responsePacket = IqPacketGenerator.generateIqResultPacket();
+        responsePacket.setTo(packet.getFrom());
+        responsePacket.setId(packet.getId());
+
+        Element query = responsePacket.addChild(ServiceDiscovery.ELEMENT, ServiceDiscovery.NAMESPACE);
+        query.setAttribute("node", packet.query().getAttribute("node"));
+        final Element identity = query.addChild("identity");
+        identity.setAttribute("category", "client");
+        identity.setAttribute("type", FeatureRegistry.IDENTITY_TYPE);
+        identity.setAttribute("name", ConversationsPlusApplication.getNameAndVersion());
+        for (final String feature : FeatureRegistry.getFeatures()) {
+            query.addChild("feature").setAttribute("var", feature);
+        }
+
+        return responsePacket;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketHandler.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketHandler.java
new file mode 100644
index 00000000..6f1b0676
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketHandler.java
@@ -0,0 +1,21 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.NotAllowedIqException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ */
+public class ServiceDiscoveryIqPacketHandler implements IqPacketHandler {
+    @Override
+    public void handleIqPacket(Account account, IqPacket packet) throws IqPacketErrorException {
+        if (packet.getType() == IqPacket.TYPE.GET) {
+            XmppSendUtil.sendIqPacket(account, ServiceDiscoveryIqPacketGenerator.generateResponse(packet));
+        } else {
+            throw new NotAllowedIqException(packet, "only type=get allowed for processing an service discovery (XEP-0030)");
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketParser.java
new file mode 100644
index 00000000..0ea0d752
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryIqPacketParser.java
@@ -0,0 +1,15 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import de.thedevstack.conversationsplus.entities.ServiceDiscoveryResult;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ */
+public class ServiceDiscoveryIqPacketParser {
+    public static ServiceDiscoveryResult parse(IqPacket packet) {
+        if (packet.getType() == IqPacket.TYPE.RESULT) {
+            return new ServiceDiscoveryResult(packet);
+        }
+        return null;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryXep.java
new file mode 100644
index 00000000..6a21c71b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/disco/ServiceDiscoveryXep.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.xmpp.disco;
+
+import de.thedevstack.conversationsplus.xmpp.AbstractXep;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+
+/**
+ */
+public class ServiceDiscoveryXep extends AbstractXep {
+    public ServiceDiscoveryXep() {
+        super();
+    }
+
+    public ServiceDiscoveryXep(boolean enabled) {
+        super(enabled);
+    }
+
+    @Override
+    public String xepNumber() {
+        return "0030";
+    }
+
+    @Override
+    public String shortName() {
+        return "disco";
+    }
+
+    @Override
+    public String name() {
+        return "Service Discovery";
+    }
+
+    @Override
+    public String namespace() {
+        return ServiceDiscovery.NAMESPACE;
+    }
+
+    @Override
+    public String featureNamespace() {
+        return ServiceDiscovery.NAMESPACE;
+    }
+
+    @Override
+    public String elementName() {
+        return ServiceDiscovery.ELEMENT;
+    }
+
+    @Override
+    public IqPacketHandler handler() {
+        return new ServiceDiscoveryIqPacketHandler();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/NotAllowedIqException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/NotAllowedIqException.java
new file mode 100644
index 00000000..45bf231a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/NotAllowedIqException.java
@@ -0,0 +1,11 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import de.thedevstack.conversationsplus.xml.Element;
+
+/**
+ */
+public class NotAllowedIqException extends IqPacketErrorException {
+    public NotAllowedIqException(Element context, String errorMessage) {
+        super(context, errorMessage);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersion.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersion.java
new file mode 100644
index 00000000..e90ccb5a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersion.java
@@ -0,0 +1,9 @@
+package de.thedevstack.conversationsplus.xmpp.iqversion;
+
+/**
+ *
+ */
+public interface IqVersion {
+    String NAMESPACE = "jabber:iq:version";
+    String ELEMENT = "query";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacket.java
deleted file mode 100644
index a3cecdac..00000000
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacket.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package de.thedevstack.conversationsplus.xmpp.iqversion;
-
-import android.os.Build;
-
-import de.thedevstack.conversationsplus.ConversationsPlusApplication;
-import de.thedevstack.conversationsplus.xml.Element;
-import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
-
-/**
- * Representation of an software version packet as defined in XEP-0092.
- * @see <a href="http://xmpp.org/extensions/xep-0092.html">http://xmpp.org/extensions/xep-0092.html</a>
- */
-public class IqVersionPacket extends IqPacket {
-    public static final String NAMESPACE = "jabber:iq:version";
-
-    IqVersionPacket() {
-        super(IqPacket.TYPE.RESULT);
-        Element query = this.addChild("query", NAMESPACE);
-        query.addChild("name").setContent(ConversationsPlusApplication.getName());
-        query.addChild("version").setContent(ConversationsPlusApplication.getVersion());
-        query.addChild("os").setContent("Android " + Build.VERSION.RELEASE);
-    }
-}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketGenerator.java
index 97a7e90d..c4961c1d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketGenerator.java
@@ -1,6 +1,12 @@
 package de.thedevstack.conversationsplus.xmpp.iqversion;
 
+import android.os.Build;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
+import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketGenerator;
 
 /**
  * Generates the IQ Packets for Software Version
@@ -26,12 +32,17 @@ public final class IqVersionPacketGenerator {
      * @param packet the packet to respond to
      * @return
      */
-    public static IqVersionPacket generateResponse(IqPacket packet) {
-        IqVersionPacket iqVersionPacket = new IqVersionPacket();
-        iqVersionPacket.setTo(packet.getFrom());
-        iqVersionPacket.setId(packet.getId());
+    public static IqPacket generateResponse(IqPacket packet) {
+        IqPacket responsePacket = IqPacketGenerator.generateIqResultResponse(packet);
+
+        Element query = responsePacket.addChild(IqVersion.ELEMENT, IqVersion.NAMESPACE);
+        query.addChild("name").setContent(ConversationsPlusApplication.getName());
+        query.addChild("version").setContent(ConversationsPlusApplication.getVersion());
+        if (ConversationsPlusPreferences.sendOsInformation()) {
+            query.addChild("os").setContent("Android " + Build.VERSION.RELEASE);
+        }
 
-        return iqVersionPacket;
+        return responsePacket;
     }
 
     private IqVersionPacketGenerator() {}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketHandler.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketHandler.java
new file mode 100644
index 00000000..7462d0cb
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/IqVersionPacketHandler.java
@@ -0,0 +1,21 @@
+package de.thedevstack.conversationsplus.xmpp.iqversion;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.NotAllowedIqException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ */
+public class IqVersionPacketHandler implements IqPacketHandler {
+    @Override
+    public void handleIqPacket(Account account, IqPacket packet) throws IqPacketErrorException {
+        if (packet.getType() == IqPacket.TYPE.GET) {
+            XmppSendUtil.sendIqPacket(account, IqVersionPacketGenerator.generateResponse(packet));
+        } else {
+            throw new NotAllowedIqException(packet, "only type=get allowed for processing an Software Version (XEP-0092)");
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/SoftwareVersionXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/SoftwareVersionXep.java
new file mode 100644
index 00000000..9cd69bb2
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/iqversion/SoftwareVersionXep.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.xmpp.iqversion;
+
+import de.thedevstack.conversationsplus.xmpp.AbstractXep;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+
+/**
+ */
+public class SoftwareVersionXep extends AbstractXep {
+    public SoftwareVersionXep() {
+        super();
+    }
+
+    public SoftwareVersionXep(boolean enabled) {
+        super(enabled);
+    }
+
+    @Override
+    public String xepNumber() {
+        return "0092";
+    }
+
+    @Override
+    public String shortName() {
+        return "iq-version";
+    }
+
+    @Override
+    public String name() {
+        return "Software Version";
+    }
+
+    @Override
+    public String namespace() {
+        return IqVersion.NAMESPACE;
+    }
+
+    @Override
+    public String featureNamespace() {
+        return IqVersion.NAMESPACE;
+    }
+
+    @Override
+    public String elementName() {
+        return IqVersion.ELEMENT;
+    }
+
+    @Override
+    public IqPacketHandler handler() {
+        return new IqVersionPacketHandler();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/openpgp/OpenPgpXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/openpgp/OpenPgpXep.java
new file mode 100644
index 00000000..15229bf9
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/openpgp/OpenPgpXep.java
@@ -0,0 +1,48 @@
+package de.thedevstack.conversationsplus.xmpp.openpgp;
+
+import de.thedevstack.conversationsplus.xmpp.AbstractXep;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+
+/**
+ */
+public class OpenPgpXep extends AbstractXep {
+    public static final String ENCRYPTED_NAMESPACE = "jabber:x:encrypted";
+    public static final String ENCRYPTED_ELEMENT = "x";
+    public static final String SIGNED_NAMESPACE = "jabber:x:signed";
+    public static final String SIGNED_ELEMENT = "x";
+
+    @Override
+    public String xepNumber() {
+        return "0027";
+    }
+
+    @Override
+    public String shortName() {
+        return "openpgp";
+    }
+
+    @Override
+    public String name() {
+        return "Current Jabber OpenPGP Usage";
+    }
+
+    @Override
+    public String namespace() {
+        return null;
+    }
+
+    @Override
+    public String featureNamespace() {
+        return null;
+    }
+
+    @Override
+    public String elementName() {
+        return null;
+    }
+
+    @Override
+    public IqPacketHandler handler() {
+        return null;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/Ping.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/Ping.java
new file mode 100644
index 00000000..ac201c01
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/Ping.java
@@ -0,0 +1,8 @@
+package de.thedevstack.conversationsplus.xmpp.ping;
+
+/**
+ */
+public interface Ping {
+    String NAMESPACE = "urn:xmpp:ping";
+    String ELEMENT = "ping";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingPacketHandler.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingPacketHandler.java
new file mode 100644
index 00000000..14e8f57c
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingPacketHandler.java
@@ -0,0 +1,22 @@
+package de.thedevstack.conversationsplus.xmpp.ping;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.NotAllowedIqException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketGenerator;
+
+/**
+ */
+public class PingPacketHandler implements IqPacketHandler {
+    @Override
+    public void handleIqPacket(Account account, IqPacket packet) throws IqPacketErrorException {
+        if (packet.getType() == IqPacket.TYPE.GET) {
+            XmppSendUtil.sendIqPacket(account, IqPacketGenerator.generateIqResultResponse(packet));
+        } else {
+            throw new NotAllowedIqException(packet, "only type=get allowed for processing an XMPP Ping (XEP-0199)");
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingXep.java
new file mode 100644
index 00000000..6036a64f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/ping/PingXep.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.xmpp.ping;
+
+import de.thedevstack.conversationsplus.xmpp.AbstractXep;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+
+/**
+ */
+public class PingXep extends AbstractXep {
+    public PingXep() {
+        super();
+    }
+
+    public PingXep(boolean enabled) {
+        super(enabled);
+    }
+
+    @Override
+    public String xepNumber() {
+        return "0199";
+    }
+
+    @Override
+    public String shortName() {
+        return "ping";
+    }
+
+    @Override
+    public String name() {
+        return "XMPP Ping";
+    }
+
+    @Override
+    public String namespace() {
+        return Ping.NAMESPACE;
+    }
+
+    @Override
+    public String featureNamespace() {
+        return Ping.NAMESPACE;
+    }
+
+    @Override
+    public String elementName() {
+        return Ping.ELEMENT;
+    }
+
+    @Override
+    public IqPacketHandler handler() {
+        return new PingPacketHandler();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/ErrorIqPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/ErrorIqPacket.java
new file mode 100644
index 00000000..3f87202e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/ErrorIqPacket.java
@@ -0,0 +1,16 @@
+package de.thedevstack.conversationsplus.xmpp.stanzas;
+
+import de.thedevstack.conversationsplus.xml.Element;
+
+/**
+ */
+public class ErrorIqPacket extends IqPacket {
+    public final static String NAMESPACE = "urn:ietf:params:xml:ns:xmpp-stanzas";
+
+    public ErrorIqPacket(IqErrorCondition condition) {
+        super(IqPacket.TYPE.ERROR);
+        final Element error = this.addChild("error");
+        error.setAttribute("type", condition.getType().toString());
+        error.addChild(condition.toString(), NAMESPACE);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorCondition.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorCondition.java
new file mode 100644
index 00000000..688ea007
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorCondition.java
@@ -0,0 +1,48 @@
+package de.thedevstack.conversationsplus.xmpp.stanzas;
+
+/**
+ */
+public enum IqErrorCondition {
+    BAD_REQUEST(IqErrorType.MODIFY),
+    CONFLICT(IqErrorType.CANCEL),
+    FEATURE_NOT_IMPLEMENTED(IqErrorType.CANCEL),
+    FORBIDDEN(IqErrorType.AUTH),
+    GONE(IqErrorType.MODIFY),
+    INTERNAL_SERVER_ERROR(IqErrorType.WAIT),
+    ITEM_NOT_FOUND(IqErrorType.CANCEL),
+    JID_MALFORMED(IqErrorType.MODIFY),
+    NOT_ACCEPTABLE(IqErrorType.MODIFY),
+    NOT_ALLOWED(IqErrorType.CANCEL),
+    NOT_AUTHORIZED(IqErrorType.AUTH),
+    PAYMENT_REQUIRED(IqErrorType.AUTH),
+    RECIPIENT_UNAVAILABLE(IqErrorType.WAIT),
+    REDIRECT(IqErrorType.MODIFY),
+    REGISTRATION_REQUIRED(IqErrorType.AUTH),
+    REMOTE_SERVER_NOT_FOUND(IqErrorType.CANCEL),
+    REMOTE_SERVER_TIMEOUT(IqErrorType.WAIT),
+    RESOURCE_CONSTRAINT(IqErrorType.WAIT),
+    SERVICE_UNAVAILABLE(IqErrorType.CANCEL),
+    SUBSCRIPTION_REQUIRED(IqErrorType.AUTH),
+    UNDEFINED_CONDITION(IqErrorType.CANCEL),
+    UNEXPECTED_REQUEST(IqErrorType.WAIT)
+    ;
+
+    private IqErrorType type;
+
+    IqErrorCondition(IqErrorType type) {
+        this.type = type;
+    }
+
+    public IqErrorType getType() {
+        return type;
+    }
+
+    public static IqErrorCondition fromString(String condition) {
+        return (null != condition) ? Enum.valueOf(IqErrorCondition.class, condition.toUpperCase().replaceAll("-", "_")) : null;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase().replaceAll("_", "-");
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorType.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorType.java
new file mode 100644
index 00000000..4ebe0f41
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqErrorType.java
@@ -0,0 +1,12 @@
+package de.thedevstack.conversationsplus.xmpp.stanzas;
+
+/**
+ */
+public enum IqErrorType {
+    CANCEL, MODIFY, AUTH, WAIT;
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacket.java
index d86831e0..415d5de3 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacket.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacket.java
@@ -59,6 +59,10 @@ public class IqPacket extends AbstractAcknowledgeableStanza {
 		}
 	}
 
+	public Element getChildElement() {
+        return this.children.get(0);
+    }
+
 	public IqPacket generateResponse(final TYPE type) {
 		final IqPacket packet = new IqPacket(type);
 		packet.setTo(this.getFrom());
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketGenerator.java
index 27e6607f..01204a96 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketGenerator.java
@@ -1,5 +1,7 @@
 package de.thedevstack.conversationsplus.xmpp.stanzas;
 
+import de.thedevstack.conversationsplus.xml.Element;
+
 /**
  * Created by tzur on 15.01.2016.
  */
@@ -21,8 +23,19 @@ public final class IqPacketGenerator {
         return generateIqPacket(IqPacket.TYPE.RESULT);
     }
 
-    public static IqPacket generateIqErrorPacket() {
-        return generateIqPacket(IqPacket.TYPE.ERROR);
+    public static IqPacket generateIqResultResponse(IqPacket packet) {
+        IqPacket responsePacket = generateIqResultPacket();
+        responsePacket.setTo(packet.getFrom());
+        responsePacket.setId(packet.getId());
+
+        return responsePacket;
+    }
+
+    public static ErrorIqPacket generateIqErrorPacketResponse(IqErrorCondition condition, IqPacket packet) {
+        ErrorIqPacket errorPacket = new ErrorIqPacket(condition);
+        errorPacket.setTo(packet.getFrom());
+        errorPacket.setId(packet.getId());
+        return errorPacket;
     }
 
     private IqPacketGenerator() {
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketReceiver.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketReceiver.java
new file mode 100644
index 00000000..bfae0355
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/IqPacketReceiver.java
@@ -0,0 +1,96 @@
+package de.thedevstack.conversationsplus.xmpp.stanzas;
+
+import java.util.Hashtable;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.parser.IqParser;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
+import de.thedevstack.conversationsplus.xmpp.Xep;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.NotAllowedIqException;
+
+/**
+ */
+public final class IqPacketReceiver implements OnIqPacketReceived {
+    private final Hashtable<String, IqPacketHandler> iqPacketHandlers = new Hashtable<>();
+    private final IqParser legacyIqParser;
+    private static IqPacketReceiver INSTANCE;
+
+    public synchronized static IqPacketReceiver getInstance() {
+        if (null == INSTANCE) {
+            IqPacketReceiver.INSTANCE = new IqPacketReceiver();
+        }
+        return INSTANCE;
+    }
+
+    private IqPacketReceiver() {
+        this.legacyIqParser = new IqParser(XmppConnectionServiceAccessor.xmppConnectionService);
+    }
+
+    @Override
+    public void onIqPacketReceived(Account account, IqPacket packet) {
+        String key = generateKey(packet);
+        if (null != key && this.iqPacketHandlers.containsKey(key)) {
+            try {
+                IqPacketHandler iqPacketHandler = this.iqPacketHandlers.get(key);
+                iqPacketHandler.handleIqPacket(account, packet);
+            } catch (NotAllowedIqException e) {
+                ErrorIqPacket errorIqPacket = IqPacketGenerator.generateIqErrorPacketResponse(IqErrorCondition.NOT_ALLOWED, packet);
+                XmppSendUtil.sendIqPacket(account, errorIqPacket);
+            } catch (IqPacketErrorException e) {
+
+            }
+        } else {
+            this.legacyIqParser.onIqPacketReceived(account, packet);
+        }
+    }
+
+    public static String generateKey(IqPacket packet) {
+        Element childElement = packet.getChildElement();
+        return generateKey(childElement.getName(), childElement.getNamespace());
+    }
+
+    public static String generateKey(String elementName, String xmlns) {
+        if (null == elementName && null == xmlns) {
+            return null;
+        }
+        return ((null != elementName) ? elementName : "") + ((null != xmlns) ? ("-" + xmlns) : "");
+    }
+
+    public void registerIqPacketHandler(String elementName, String xmlns, IqPacketHandler iqPacketHandler) {
+        String key = generateKey(elementName, xmlns);
+        if (null != key) {
+            this.iqPacketHandlers.put(key, iqPacketHandler);
+        }
+    }
+
+    public void unregisterIqPacketHandler(String elementName, String xmlns) {
+        String key = generateKey(elementName, xmlns);
+        if (null != key && this.iqPacketHandlers.containsKey(key)) {
+            this.iqPacketHandlers.remove(key);
+        }
+    }
+
+    public void registerIqPacketHandler(Xep xep) {
+        String key = generateKey(xep.elementName(), xep.namespace());
+        if (null != key && null != xep.handler()) {
+            this.iqPacketHandlers.put(key, xep.handler());
+        }
+    }
+
+    public void unregisterIqPacketHandler(Xep xep) {
+        String key = generateKey(xep.elementName(), xep.namespace());
+        if (null != key && this.iqPacketHandlers.containsKey(key)) {
+            this.iqPacketHandlers.remove(key);
+        }
+    }
+
+    @Deprecated
+    public IqParser getLegacyIqParser() {
+        return this.legacyIqParser;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/ActivePacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/ActivePacket.java
index 47538a64..52b2e04d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/ActivePacket.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/ActivePacket.java
@@ -5,6 +5,6 @@ import de.thedevstack.conversationsplus.xmpp.stanzas.AbstractStanza;
 public class ActivePacket extends AbstractStanza {
 	public ActivePacket() {
 		super("active");
-		setAttribute("xmlns", "urn:xmpp:csi:0");
+		setAttribute("xmlns", Csi.NAMESPACE);
 	}
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/Csi.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/Csi.java
new file mode 100644
index 00000000..e002b093
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/Csi.java
@@ -0,0 +1,7 @@
+package de.thedevstack.conversationsplus.xmpp.stanzas.csi;
+
+/**
+ */
+public interface Csi {
+    String NAMESPACE = "urn:xmpp:csi:0";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/InactivePacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/InactivePacket.java
index ca5904a5..35486858 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/InactivePacket.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/stanzas/csi/InactivePacket.java
@@ -5,6 +5,6 @@ import de.thedevstack.conversationsplus.xmpp.stanzas.AbstractStanza;
 public class InactivePacket extends AbstractStanza {
 	public InactivePacket() {
 		super("inactive");
-		setAttribute("xmlns", "urn:xmpp:csi:0");
+		setAttribute("xmlns", Csi.NAMESPACE);
 	}
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTime.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTime.java
new file mode 100644
index 00000000..7382f37a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTime.java
@@ -0,0 +1,8 @@
+package de.thedevstack.conversationsplus.xmpp.time;
+
+/**
+ */
+public interface EntityTime {
+    String NAMESPACE = "urn:xmpp:time";
+    String ELEMENT = "time";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTimeXep.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTimeXep.java
new file mode 100644
index 00000000..fb721bce
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/EntityTimeXep.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.xmpp.time;
+
+import de.thedevstack.conversationsplus.xmpp.AbstractXep;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+
+/**
+ */
+public class EntityTimeXep extends AbstractXep {
+    public EntityTimeXep() {
+        super();
+    }
+
+    public EntityTimeXep(boolean enabled) {
+        super(enabled);
+    }
+
+    @Override
+    public String xepNumber() {
+        return "0202";
+    }
+
+    @Override
+    public String shortName() {
+        return "time";
+    }
+
+    @Override
+    public String name() {
+        return "Entity Time";
+    }
+
+    @Override
+    public String namespace() {
+        return EntityTime.NAMESPACE;
+    }
+
+    @Override
+    public String featureNamespace() {
+        return EntityTime.NAMESPACE;
+    }
+
+    @Override
+    public String elementName() {
+        return EntityTime.ELEMENT;
+    }
+
+    @Override
+    public IqPacketHandler handler() {
+        return new TimeIqPacketHandler();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimeIqPacketHandler.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimeIqPacketHandler.java
new file mode 100644
index 00000000..961c649b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimeIqPacketHandler.java
@@ -0,0 +1,21 @@
+package de.thedevstack.conversationsplus.xmpp.time;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.IqPacketHandler;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.NotAllowedIqException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ */
+public class TimeIqPacketHandler implements IqPacketHandler {
+    @Override
+    public void handleIqPacket(Account account, IqPacket packet) throws IqPacketErrorException {
+        if (packet.getType() == IqPacket.TYPE.GET) {
+            XmppSendUtil.sendIqPacket(account, TimePacketGenerator.generateResponse(packet));
+        } else {
+            throw new NotAllowedIqException(packet, "only type=get allowed for processing an Entity Time (XEP-0202)");
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacket.java
deleted file mode 100644
index d8756d41..00000000
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacket.java
+++ /dev/null
@@ -1,35 +0,0 @@
-package de.thedevstack.conversationsplus.xmpp.time;
-
-import java.util.Locale;
-import java.util.TimeZone;
-
-import de.thedevstack.conversationsplus.generator.AbstractGenerator;
-import de.thedevstack.conversationsplus.xml.Element;
-import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
-
-/**
- * Representation of an software version packet as defined in XEP-0202.
- * @see <a href="http://xmpp.org/extensions/xep-0202.html">http://xmpp.org/extensions/xep-0202.html</a>
- */
-public class TimePacket extends IqPacket {
-    public static final String NAMESPACE = "urn:xmpp:time";
-
-    TimePacket() {
-        super(IqPacket.TYPE.RESULT);
-        Element time = this.addChild("time", NAMESPACE);
-        final long now = System.currentTimeMillis();
-        time.addChild("utc").setContent(AbstractGenerator.getTimestamp(now));
-        TimeZone ourTimezone = TimeZone.getDefault();
-        long offsetSeconds = ourTimezone.getOffset(now) / 1000;
-        long offsetMinutes = Math.abs((offsetSeconds % 3600) / 60);
-        long offsetHours = offsetSeconds / 3600;
-        String hours;
-        if (offsetHours < 0) {
-            hours = String.format(Locale.US, "%03d", offsetHours);
-        } else {
-            hours = String.format(Locale.US, "%02d", offsetHours);
-        }
-        String minutes = String.format(Locale.US, "%02d", offsetMinutes);
-        time.addChild("tzo").setContent(hours + ":" + minutes);
-    }
-}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacketGenerator.java
index 344beb9e..ef381d4d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacketGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/time/TimePacketGenerator.java
@@ -1,7 +1,12 @@
 package de.thedevstack.conversationsplus.xmpp.time;
 
-import de.thedevstack.conversationsplus.xmpp.iqversion.IqVersionPacket;
+import java.util.Locale;
+import java.util.TimeZone;
+
+import de.thedevstack.conversationsplus.generator.AbstractGenerator;
+import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacketGenerator;
 
 /**
  * Generates the IQ Packets for Entity Time
@@ -26,12 +31,26 @@ public final class TimePacketGenerator {
      * @param packet
      * @return
      */
-    public static TimePacket generateResponse(IqPacket packet) {
-        TimePacket timePacket = new TimePacket();
-        timePacket.setTo(packet.getFrom());
-        timePacket.setId(packet.getId());
+    public static IqPacket generateResponse(IqPacket packet) {
+        IqPacket responsePacket = IqPacketGenerator.generateIqResultResponse(packet);
+
+        Element time = responsePacket.addChild(EntityTime.ELEMENT, EntityTime.NAMESPACE);
+        final long now = System.currentTimeMillis();
+        time.addChild("utc").setContent(AbstractGenerator.getTimestamp(now));
+        TimeZone ourTimezone = TimeZone.getDefault();
+        long offsetSeconds = ourTimezone.getOffset(now) / 1000;
+        long offsetMinutes = Math.abs((offsetSeconds % 3600) / 60);
+        long offsetHours = offsetSeconds / 3600;
+        String hours;
+        if (offsetHours < 0) {
+            hours = String.format(Locale.US, "%03d", offsetHours);
+        } else {
+            hours = String.format(Locale.US, "%02d", offsetHours);
+        }
+        String minutes = String.format(Locale.US, "%02d", offsetMinutes);
+        time.addChild("tzo").setContent(hours + ":" + minutes);
 
-        return timePacket;
+        return responsePacket;
     }
 
     private TimePacketGenerator() {}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java
index bcc5e9dd..f3ac92dc 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java
@@ -7,26 +7,26 @@ import de.thedevstack.conversationsplus.xmpp.exceptions.InternalServerErrorExcep
 import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
 import de.thedevstack.conversationsplus.xmpp.exceptions.ServiceUnavailableException;
 import de.thedevstack.conversationsplus.xmpp.exceptions.UndefinedConditionException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.ErrorIqPacket;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqErrorCondition;
 
 /**
- * Created by steckbrief on 22.08.2016.
  */
 public final class ErrorIqPacketExceptionHelper {
-    private final static String ERROR_NAMESPACE = "urn:ietf:params:xml:ns:xmpp-stanzas";
 
     public static void throwIqErrorException(Element errorIqPacket) throws IqPacketErrorException {
         Element packet = IqPacketParser.findChild(errorIqPacket, "error", "jabber:client");
         if (null != packet) {
-            if (hasErrorElement(packet, "bad-request")) {
+            if (hasErrorElement(packet, IqErrorCondition.BAD_REQUEST.toString())) {
                 throw new BadRequestIqErrorException(errorIqPacket, getErrorText(packet));
             }
-            if (hasErrorElement(packet, "service-unavailable")) {
+            if (hasErrorElement(packet, IqErrorCondition.SERVICE_UNAVAILABLE.toString())) {
                 throw new ServiceUnavailableException(errorIqPacket, getErrorText(packet));
             }
-            if (hasErrorElement(packet, "internal-server-error")) {
+            if (hasErrorElement(packet, IqErrorCondition.INTERNAL_SERVER_ERROR.toString())) {
                 throw new InternalServerErrorException(errorIqPacket, getErrorText(packet));
             }
-            if (hasErrorElement(packet, "undefined-condition")) {
+            if (hasErrorElement(packet, IqErrorCondition.UNDEFINED_CONDITION.toString())) {
                 throw new UndefinedConditionException(errorIqPacket, getErrorText(packet));
             }
         }
@@ -34,11 +34,11 @@ public final class ErrorIqPacketExceptionHelper {
     }
 
     private static boolean hasErrorElement(Element packet, String elementName) {
-        return null != IqPacketParser.findChild(packet, elementName, ERROR_NAMESPACE);
+        return null != IqPacketParser.findChild(packet, elementName, ErrorIqPacket.NAMESPACE);
     }
 
     private static String getErrorText(Element packet) {
-        return IqPacketParser.findChildContent(packet, "text", ERROR_NAMESPACE);
+        return IqPacketParser.findChildContent(packet, "text", ErrorIqPacket.NAMESPACE);
     }
 
     private ErrorIqPacketExceptionHelper() {
diff --git a/src/main/res/values-de/strings.xml b/src/main/res/values-de/strings.xml
index d514f08f..b762f420 100644
--- a/src/main/res/values-de/strings.xml
+++ b/src/main/res/values-de/strings.xml
@@ -639,4 +639,13 @@
   <string name="pref_log_stanzas">Stanzas protokollieren</string>
   <string name="contact_paused_typing">...macht eine Schreibpause</string>
   <string name="is_typing">...schreibt</string>
+    <string name="pref_privacy_summary">Einstellungen zum Datenschutz</string>
+  <string name="pref_privacy">Datenschutz</string>
+  <string name="pref_privacy_security">Datenschutz &amp; Sicherheit</string>
+  <string name="pref_entity_time_summary">Sends your current time</string>
+  <string name="pref_entity_time">Send Entity Time</string>
+  <string name="pref_software_info_summary">Sends information about this client</string>
+  <string name="pref_software_info">Send client information</string>
+  <string name="pref_send_os_info_summary">Sends information about your android version</string>
+  <string name="pref_send_os_info">Send your android version</string>
 </resources>
diff --git a/src/main/res/values/strings.xml b/src/main/res/values/strings.xml
index 2055c5de..0ab2c02c 100644
--- a/src/main/res/values/strings.xml
+++ b/src/main/res/values/strings.xml
@@ -690,4 +690,13 @@
 	<string name="pref_log_stanzas">Log stanzas</string>
 	<string name="contact_paused_typing">...has stopped typing</string>
 	<string name="is_typing">...is writing</string>
+    <string name="pref_privacy_summary">Privacy Settings</string>
+	<string name="pref_privacy">Privacy</string>
+	<string name="pref_privacy_security">Privacy and Security</string>
+	<string name="pref_entity_time_summary">Sends your current time</string>
+	<string name="pref_entity_time">Send Entity Time</string>
+	<string name="pref_software_info_summary">Sends information about this client</string>
+	<string name="pref_software_info">Send client information</string>
+	<string name="pref_send_os_info_summary">Sends information about your android version</string>
+	<string name="pref_send_os_info">Send your android version</string>
 </resources>
diff --git a/src/main/res/xml/preferences.xml b/src/main/res/xml/preferences.xml
index 96be892e..4faf1df2 100644
--- a/src/main/res/xml/preferences.xml
+++ b/src/main/res/xml/preferences.xml
@@ -16,6 +16,17 @@
             android:key="resource"
             android:summary="@string/pref_xmpp_resource_summary"
             android:title="@string/pref_xmpp_resource"/>
+        <CheckBoxPreference
+            android:defaultValue="true"
+            android:key="parse_emoticons"
+            android:summary="@string/pref_parse_emoticons_summary"
+            android:title="@string/pref_parse_emoticons"/>
+    </PreferenceCategory>
+    <PreferenceCategory android:title="@string/pref_privacy_security">
+        <PreferenceScreen
+            android:summary="@string/pref_privacy_summary"
+            android:title="@string/pref_privacy">
+            <PreferenceCategory android:title="@string/pref_general">
                 <ListPreference
                     android:defaultValue="2"
                     android:entries="@array/confirm_strings"
@@ -31,9 +42,58 @@
                     android:title="@string/pref_chat_states"/>
                 <CheckBoxPreference
                     android:defaultValue="true"
-            android:key="parse_emoticons"
-            android:summary="@string/pref_parse_emoticons_summary"
-            android:title="@string/pref_parse_emoticons"/>
+                    android:key="send_entity_time"
+                    android:summary="@string/pref_entity_time_summary"
+                    android:title="@string/pref_entity_time"/>
+                <CheckBoxPreference
+                    android:defaultValue="true"
+                    android:key="send_software_info"
+                    android:summary="@string/pref_software_info_summary"
+                    android:title="@string/pref_software_info"/>
+                <CheckBoxPreference
+                    android:defaultValue="true"
+                    android:key="send_os_info"
+                    android:dependency="send_software_info"
+                    android:summary="@string/pref_send_os_info_summary"
+                    android:title="@string/pref_send_os_info"/>
+            </PreferenceCategory>
+            <PreferenceCategory android:title="@string/pref_presence_settings">
+                <CheckBoxPreference
+                    android:defaultValue="false"
+                    android:key="away_when_screen_off"
+                    android:summary="@string/pref_away_when_screen_off_summary"
+                    android:title="@string/pref_away_when_screen_off"/>
+                <CheckBoxPreference
+                    android:defaultValue="false"
+                    android:key="xa_on_silent_mode"
+                    android:summary="@string/pref_xa_on_silent_mode_summary"
+                    android:title="@string/pref_xa_on_silent_mode"/>
+                <CheckBoxPreference
+                    android:dependency="xa_on_silent_mode"
+                    android:defaultValue="false"
+                    android:key="treat_vibrate_as_silent"
+                    android:title="@string/pref_treat_vibrate_as_silent"
+                    android:summary="@string/pref_treat_vibrate_as_silent_summary"/>
+            </PreferenceCategory>
+        </PreferenceScreen>
+        <PreferenceScreen android:title="@string/pref_security_settings">
+            <PreferenceCategory android:title="@string/pref_security_settings">
+                <CheckBoxPreference
+                    android:defaultValue="false"
+                    android:key="dont_save_encrypted"
+                    android:summary="@string/pref_dont_save_encrypted_summary"
+                    android:title="@string/pref_dont_save_encrypted"/>
+                <CheckBoxPreference
+                    android:defaultValue="false"
+                    android:key="dont_trust_system_cas"
+                    android:summary="@string/pref_dont_trust_system_cas_summary"
+                    android:title="@string/pref_dont_trust_system_cas_title"/>
+                <Preference
+                    android:key="remove_trusted_certificates"
+                    android:summary="@string/pref_remove_trusted_certificates_summary"
+                    android:title="@string/pref_remove_trusted_certificates_title"/>
+            </PreferenceCategory>
+        </PreferenceScreen>
     </PreferenceCategory>
     <PreferenceCategory android:title="@string/pref_file_transfer_category">
         <PreferenceScreen
@@ -184,22 +244,6 @@
             android:key="expert"
             android:summary="@string/pref_expert_options_summary"
             android:title="@string/pref_expert_options">
-            <PreferenceCategory android:title="@string/pref_security_settings">
-                <CheckBoxPreference
-                    android:defaultValue="false"
-                    android:key="dont_save_encrypted"
-                    android:summary="@string/pref_dont_save_encrypted_summary"
-                    android:title="@string/pref_dont_save_encrypted"/>
-                <CheckBoxPreference
-                    android:defaultValue="false"
-                    android:key="dont_trust_system_cas"
-                    android:summary="@string/pref_dont_trust_system_cas_summary"
-                    android:title="@string/pref_dont_trust_system_cas_title"/>
-                <Preference
-                    android:key="remove_trusted_certificates"
-                    android:summary="@string/pref_remove_trusted_certificates_summary"
-                    android:title="@string/pref_remove_trusted_certificates_title"/>
-            </PreferenceCategory>
             <PreferenceCategory
                 android:key="connection_options"
                 android:title="@string/pref_connection_options">
@@ -221,24 +265,6 @@
                     android:summary="@string/pref_display_enter_key_summary"
                     android:title="@string/pref_display_enter_key"/>
             </PreferenceCategory>
-            <PreferenceCategory android:title="@string/pref_presence_settings">
-                <CheckBoxPreference
-                    android:defaultValue="false"
-                    android:key="away_when_screen_off"
-                    android:summary="@string/pref_away_when_screen_off_summary"
-                    android:title="@string/pref_away_when_screen_off"/>
-                <CheckBoxPreference
-                    android:defaultValue="false"
-                    android:key="xa_on_silent_mode"
-                    android:summary="@string/pref_xa_on_silent_mode_summary"
-                    android:title="@string/pref_xa_on_silent_mode"/>
-                <CheckBoxPreference
-                    android:dependency="xa_on_silent_mode"
-                    android:defaultValue="false"
-                    android:key="treat_vibrate_as_silent"
-                    android:title="@string/pref_treat_vibrate_as_silent"
-                    android:summary="@string/pref_treat_vibrate_as_silent_summary"/>
-            </PreferenceCategory>
             <PreferenceCategory android:key="other_expert_settings" android:title="@string/pref_expert_options_other">
                 <CheckBoxPreference
                     android:key="autojoin"