diff --git a/src/messenger/webim/js/compiled/chat/collections/messages.js b/src/messenger/webim/js/compiled/chat/collections/messages.js
index 47f2c678..1c73b406 100644
--- a/src/messenger/webim/js/compiled/chat/collections/messages.js
+++ b/src/messenger/webim/js/compiled/chat/collections/messages.js
@@ -5,6 +5,6 @@
  Copyright (c) 2005-2011 Mibew Messenger Community
  License: http://mibew.org/license.php
 */
-(function(b,d,f){b.Collections.Messages=d.Collection.extend({model:b.Models.Message,initialize:function(){this.periodicallyCalled=[];this.periodicallyCalled.push(b.Objects.server.callFunctionsPeriodically(f.bind(this.updateMessagesFunctionBuilder,this),f.bind(this.updateMessages,this)))},finalize:function(){for(var a=0;a<this.periodicallyCalled.length;a++)b.Objects.server.stopCallFunctionsPeriodically(this.periodicallyCalled[a])},updateMessages:function(a){a.lastId&&b.Objects.Models.thread.set({lastId:a.lastId});
-for(var c=[],e=0,d=a.messages.length;e<d;e++)c.push(new b.Models.Message(a.messages[e]));0<c.length&&this.add(c)},updateMessagesFunctionBuilder:function(){var a=b.Objects.Models.thread,c=b.Objects.Models.user;return[{"function":"updateMessages",arguments:{"return":{messages:"messages",lastId:"lastId"},references:{},threadId:a.get("id"),token:a.get("token"),lastId:a.get("lastId"),user:!c.get("isAgent")}}]},add:function(){var a=Array.prototype.slice.apply(arguments),a=d.Collection.prototype.add.apply(this,
-a);this.trigger("multiple:add");return a}})})(Mibew,Backbone,_);
+(function(c,d,h){c.Collections.Messages=d.Collection.extend({model:c.Models.Message,initialize:function(){this.periodicallyCalled=[];this.periodicallyCalled.push(c.Objects.server.callFunctionsPeriodically(h.bind(this.updateMessagesFunctionBuilder,this),h.bind(this.updateMessages,this)))},finalize:function(){for(var a=0;a<this.periodicallyCalled.length;a++)c.Objects.server.stopCallFunctionsPeriodically(this.periodicallyCalled[a])},updateMessages:function(a){a.lastId&&c.Objects.Models.thread.set({lastId:a.lastId});
+for(var j=c.Models.Message.prototype.KIND_PLUGIN,f=[],b,e,g=0,d=a.messages.length;g<d;g++)b=a.messages[g],b.kind!=j?f.push(new c.Models.Message(b)):"object"!=typeof b.message||null===b.message||(e=b.message.plugin||!1,e="process:"+(!1!==e?e+":":"")+"plugin:message",b={messageData:b,model:!1},this.trigger(e,b),b.model&&f.push(b.model));0<f.length&&this.add(f)},updateMessagesFunctionBuilder:function(){var a=c.Objects.Models.thread,d=c.Objects.Models.user;return[{"function":"updateMessages",arguments:{"return":{messages:"messages",
+lastId:"lastId"},references:{},threadId:a.get("id"),token:a.get("token"),lastId:a.get("lastId"),user:!d.get("isAgent")}}]},add:function(){var a=Array.prototype.slice.apply(arguments),a=d.Collection.prototype.add.apply(this,a);this.trigger("multiple:add");return a}})})(Mibew,Backbone,_);
diff --git a/src/messenger/webim/js/compiled/chat_app.js b/src/messenger/webim/js/compiled/chat_app.js
index 837aa60c..c7da5408 100644
--- a/src/messenger/webim/js/compiled/chat_app.js
+++ b/src/messenger/webim/js/compiled/chat_app.js
@@ -141,9 +141,9 @@ groupId:a.get("groupId"),name:a.get("name"),info:a.get("info"),email:a.get("emai
  Copyright (c) 2005-2011 Mibew Messenger Community
  License: http://mibew.org/license.php
 */
-(function(b,d,f){b.Collections.Messages=d.Collection.extend({model:b.Models.Message,initialize:function(){this.periodicallyCalled=[];this.periodicallyCalled.push(b.Objects.server.callFunctionsPeriodically(f.bind(this.updateMessagesFunctionBuilder,this),f.bind(this.updateMessages,this)))},finalize:function(){for(var a=0;a<this.periodicallyCalled.length;a++)b.Objects.server.stopCallFunctionsPeriodically(this.periodicallyCalled[a])},updateMessages:function(a){a.lastId&&b.Objects.Models.thread.set({lastId:a.lastId});
-for(var c=[],e=0,d=a.messages.length;e<d;e++)c.push(new b.Models.Message(a.messages[e]));0<c.length&&this.add(c)},updateMessagesFunctionBuilder:function(){var a=b.Objects.Models.thread,c=b.Objects.Models.user;return[{"function":"updateMessages",arguments:{"return":{messages:"messages",lastId:"lastId"},references:{},threadId:a.get("id"),token:a.get("token"),lastId:a.get("lastId"),user:!c.get("isAgent")}}]},add:function(){var a=Array.prototype.slice.apply(arguments),a=d.Collection.prototype.add.apply(this,
-a);this.trigger("multiple:add");return a}})})(Mibew,Backbone,_);
+(function(c,d,h){c.Collections.Messages=d.Collection.extend({model:c.Models.Message,initialize:function(){this.periodicallyCalled=[];this.periodicallyCalled.push(c.Objects.server.callFunctionsPeriodically(h.bind(this.updateMessagesFunctionBuilder,this),h.bind(this.updateMessages,this)))},finalize:function(){for(var a=0;a<this.periodicallyCalled.length;a++)c.Objects.server.stopCallFunctionsPeriodically(this.periodicallyCalled[a])},updateMessages:function(a){a.lastId&&c.Objects.Models.thread.set({lastId:a.lastId});
+for(var j=c.Models.Message.prototype.KIND_PLUGIN,f=[],b,e,g=0,d=a.messages.length;g<d;g++)b=a.messages[g],b.kind!=j?f.push(new c.Models.Message(b)):"object"!=typeof b.message||null===b.message||(e=b.message.plugin||!1,e="process:"+(!1!==e?e+":":"")+"plugin:message",b={messageData:b,model:!1},this.trigger(e,b),b.model&&f.push(b.model));0<f.length&&this.add(f)},updateMessagesFunctionBuilder:function(){var a=c.Objects.Models.thread,d=c.Objects.Models.user;return[{"function":"updateMessages",arguments:{"return":{messages:"messages",
+lastId:"lastId"},references:{},threadId:a.get("id"),token:a.get("token"),lastId:a.get("lastId"),user:!d.get("isAgent")}}]},add:function(){var a=Array.prototype.slice.apply(arguments),a=d.Collection.prototype.add.apply(this,a);this.trigger("multiple:add");return a}})})(Mibew,Backbone,_);
 /*
  This file is part of Mibew Messenger project.
  http://mibew.org
diff --git a/src/messenger/webim/js/compiled/default/model_views/message.js b/src/messenger/webim/js/compiled/default/model_views/message.js
index 905a0d28..a37e0a1f 100644
--- a/src/messenger/webim/js/compiled/default/model_views/message.js
+++ b/src/messenger/webim/js/compiled/default/model_views/message.js
@@ -6,4 +6,4 @@
  License: http://mibew.org/license.php
 */
 (function(c,d,e){var f={"<":"&lt;",">":"&gt;","&":"&amp;",'"':"&quot;","'":"&#x27;","`":"&#x60;"},g=/[&<>'"`]/g;c.Views.Message=d.Marionette.ItemView.extend({template:e.templates.message,className:"message",modelEvents:{change:"render"},serializeData:function(){var a=this.model.toJSON(),b=this.model.get("kind");a.allowFormatting=b!=this.model.KIND_USER&&b!=this.model.KIND_AGENT;a.kindName=this.kindToString(b);a.message=this.escapeString(a.message);return a},kindToString:function(a){return a==this.model.KIND_USER?
-"user":a==this.model.KIND_AGENT?"agent":a==this.model.KIND_FOR_AGENT?"hidden":a==this.model.KIND_INFO?"inf":a==this.model.KIND_CONN?"conn":a==this.model.KIND_EVENTS?"event":""},escapeString:function(a){return a.replace(g,function(a){return f[a]||"&amp;"})}})})(Mibew,Backbone,Handlebars);
+"user":a==this.model.KIND_AGENT?"agent":a==this.model.KIND_FOR_AGENT?"hidden":a==this.model.KIND_INFO?"inf":a==this.model.KIND_CONN?"conn":a==this.model.KIND_EVENTS?"event":a==this.model.KIND_PLUGIN?"plugin":""},escapeString:function(a){return a.replace(g,function(a){return f[a]||"&amp;"})}})})(Mibew,Backbone,Handlebars);
diff --git a/src/messenger/webim/js/compiled/default/models/message.js b/src/messenger/webim/js/compiled/default/models/message.js
index 0cecfd73..5a94d6c5 100644
--- a/src/messenger/webim/js/compiled/default/models/message.js
+++ b/src/messenger/webim/js/compiled/default/models/message.js
@@ -5,4 +5,4 @@
  Copyright (c) 2005-2011 Mibew Messenger Community
  License: http://mibew.org/license.php
 */
-(function(a){a.Models.Message=a.Models.Base.extend({defaults:{kind:null,created:0,name:"",message:""},KIND_USER:1,KIND_AGENT:2,KIND_FOR_AGENT:3,KIND_INFO:4,KIND_CONN:5,KIND_EVENTS:6})})(Mibew);
+(function(a){a.Models.Message=a.Models.Base.extend({defaults:{kind:null,created:0,name:"",message:""},KIND_USER:1,KIND_AGENT:2,KIND_FOR_AGENT:3,KIND_INFO:4,KIND_CONN:5,KIND_EVENTS:6,KIND_PLUGIN:7})})(Mibew);
diff --git a/src/messenger/webim/js/compiled/default_app.js b/src/messenger/webim/js/compiled/default_app.js
index 02010780..d6a9c329 100644
--- a/src/messenger/webim/js/compiled/default_app.js
+++ b/src/messenger/webim/js/compiled/default_app.js
@@ -73,7 +73,7 @@ b.Utils.playSound=function(a){c("body").append('<audio autoplay style="display:
  Copyright (c) 2005-2011 Mibew Messenger Community
  License: http://mibew.org/license.php
 */
-(function(a){a.Models.Message=a.Models.Base.extend({defaults:{kind:null,created:0,name:"",message:""},KIND_USER:1,KIND_AGENT:2,KIND_FOR_AGENT:3,KIND_INFO:4,KIND_CONN:5,KIND_EVENTS:6})})(Mibew);
+(function(a){a.Models.Message=a.Models.Base.extend({defaults:{kind:null,created:0,name:"",message:""},KIND_USER:1,KIND_AGENT:2,KIND_FOR_AGENT:3,KIND_INFO:4,KIND_CONN:5,KIND_EVENTS:6,KIND_PLUGIN:7})})(Mibew);
 /*
  This file is part of Mibew Messenger project.
  http://mibew.org
@@ -117,7 +117,7 @@ this.$el.removeClass("active"+(a?"-"+a:""))},getDashedControlType:function(){"un
  License: http://mibew.org/license.php
 */
 (function(c,d,e){var f={"<":"&lt;",">":"&gt;","&":"&amp;",'"':"&quot;","'":"&#x27;","`":"&#x60;"},g=/[&<>'"`]/g;c.Views.Message=d.Marionette.ItemView.extend({template:e.templates.message,className:"message",modelEvents:{change:"render"},serializeData:function(){var a=this.model.toJSON(),b=this.model.get("kind");a.allowFormatting=b!=this.model.KIND_USER&&b!=this.model.KIND_AGENT;a.kindName=this.kindToString(b);a.message=this.escapeString(a.message);return a},kindToString:function(a){return a==this.model.KIND_USER?
-"user":a==this.model.KIND_AGENT?"agent":a==this.model.KIND_FOR_AGENT?"hidden":a==this.model.KIND_INFO?"inf":a==this.model.KIND_CONN?"conn":a==this.model.KIND_EVENTS?"event":""},escapeString:function(a){return a.replace(g,function(a){return f[a]||"&amp;"})}})})(Mibew,Backbone,Handlebars);
+"user":a==this.model.KIND_AGENT?"agent":a==this.model.KIND_FOR_AGENT?"hidden":a==this.model.KIND_INFO?"inf":a==this.model.KIND_CONN?"conn":a==this.model.KIND_EVENTS?"event":a==this.model.KIND_PLUGIN?"plugin":""},escapeString:function(a){return a.replace(g,function(a){return f[a]||"&amp;"})}})})(Mibew,Backbone,Handlebars);
 /*
  This file is part of Mibew Messenger project.
  http://mibew.org
diff --git a/src/messenger/webim/js/source/chat/collections/messages.js b/src/messenger/webim/js/source/chat/collections/messages.js
index 42e026e8..c361de9a 100644
--- a/src/messenger/webim/js/source/chat/collections/messages.js
+++ b/src/messenger/webim/js/source/chat/collections/messages.js
@@ -63,13 +63,69 @@
                     Mibew.Objects.Models.thread.set({lastId: args.lastId});
                 }
 
+                // Use shortcut for KIND_PLUGIN
+                var kindPlugin = Mibew.Models.Message.prototype.KIND_PLUGIN;
+
                 // Get all new messages
                 var newMessages = [];
+                var messageData, pluginName, eventName, eventArgs;
                 for(var i = 0, length = args.messages.length; i < length; i++) {
-                    // Store message
-                    newMessages.push(
-                        new Mibew.Models.Message(args.messages[i])
-                    );
+                    messageData = args.messages[i];
+                    if (messageData.kind != kindPlugin) {
+                        // Message have one of the core kinds. Just store it.
+                        newMessages.push(
+                            new Mibew.Models.Message(messageData)
+                        );
+                        continue;
+                    }
+
+                    // Message have KIND_PLUGIN kind and need to be processed
+                    // by plugins to know how to display it.
+                    //
+                    // Message treat as data object with following fields:
+                    //  - 'plugin': string, name of the plugin which sent the
+                    //    message;
+                    //  - 'data': object, some data sent by the plugin.
+
+                    // Check if message is an real Object
+                    if ((typeof messageData.message != 'object')
+                        || (messageData.message === null)) {
+                        continue;
+                    }
+
+                    // Prepare event name.
+                    //
+                    // If plugin name was specified it will be
+                    // 'process:<plugin_name>:plugin:message' and
+                    // 'process:plugin:message' otherwise.
+                    pluginName = messageData.message.plugin || false;
+                    eventName = 'process:'
+                        + ((pluginName !== false) ? pluginName + ':' : '')
+                        + 'plugin:message';
+
+                    // Prepare event arguments.
+                    //
+                    // It is an object with following fields:
+                    //  - 'messageData': object which contains message data
+                    //    passed from server.
+                    //  - 'model': message model initialized by the plugin or
+                    //    boolean false if message should not be displayed. By
+                    //    default it field equals to boolean false.
+                    eventArgs = {
+                        'messageData': messageData,
+                        'model': false
+                    }
+
+                    // Trigger event. See description of eventName and eventArgs
+                    // above.
+                    this.trigger(eventName, eventArgs);
+
+                    if (eventArgs.model) {
+                        // Store custom plugin message in the collection
+                        newMessages.push(
+                            eventArgs.model
+                        );
+                    }
                 }
 
                 // Add new messages to the message collection if there are any
diff --git a/src/messenger/webim/js/source/default/model_views/message.js b/src/messenger/webim/js/source/default/model_views/message.js
index efd03978..c3764c65 100644
--- a/src/messenger/webim/js/source/default/model_views/message.js
+++ b/src/messenger/webim/js/source/default/model_views/message.js
@@ -97,6 +97,9 @@
                 if (kind == this.model.KIND_EVENTS) {
                     return "event";
                 }
+                if (kind == this.model.KIND_PLUGIN) {
+                    return "plugin";
+                }
                 return "";
             },
 
diff --git a/src/messenger/webim/js/source/default/models/message.js b/src/messenger/webim/js/source/default/models/message.js
index d50bdaae..aa102f48 100644
--- a/src/messenger/webim/js/source/default/models/message.js
+++ b/src/messenger/webim/js/source/default/models/message.js
@@ -61,7 +61,10 @@
             KIND_CONN: 5,
 
             /** System message about some events (like rename). */
-            KIND_EVENTS: 6
+            KIND_EVENTS: 6,
+
+            /** Message sent by a plugin */
+            KIND_PLUGIN: 7
 
             /** End of message kind constants */
         }
diff --git a/src/messenger/webim/libs/classes/thread.php b/src/messenger/webim/libs/classes/thread.php
index 5c036f10..e0d88eba 100644
--- a/src/messenger/webim/libs/classes/thread.php
+++ b/src/messenger/webim/libs/classes/thread.php
@@ -86,6 +86,10 @@ Class Thread {
 	 * System message about some events (like rename).
 	 */
 	const KIND_EVENTS = 6;
+	/**
+	 * Message sent by a plugin.
+	 */
+	const KIND_PLUGIN = 7;
 
 	/**
 	 * Messaging window connection timeout.
@@ -658,7 +662,8 @@ Class Thread {
 	 *  - 'kind': int, message kind, see Thread::KIND_* for details;
 	 *  - 'created': int, unix timestamp when message was created;
 	 *  - 'name': string, name of sender;
-	 *  - 'message': string, message text.
+	 *  - 'message': associative array with message data if kind equals to
+	 *    Thread::KIND_PLUGIN and message text string otherwise.
 	 * @see Thread::postMessage()
 	 */
 	public function getMessages($is_user, &$last_id) {
@@ -668,7 +673,8 @@ Class Thread {
 
 		// Load messages
 		$messages = $db->query(
-			"select messageid as id, ikind as kind, dtmcreated as created, tname as name, tmessage as message " .
+			"select messageid as id, ikind as kind, dtmcreated as created, " .
+			" tname as name, tmessage as message " .
 			"from {chatmessage} " .
 			"where threadid = :threadid and messageid > :lastid " .
 			($is_user ? "and ikind <> " . self::KIND_FOR_AGENT : "") .
@@ -681,9 +687,28 @@ Class Thread {
 		);
 
 		foreach ($messages as $key => $msg) {
-			// Change message fields encoding
-			$messages[$key]['name'] = myiconv($webim_encoding, "utf-8", $msg['name']);
-			$messages[$key]['message'] = myiconv($webim_encoding, "utf-8", $msg['message']);
+			// Change sender name encoding
+			$messages[$key]['name'] = myiconv(
+				$webim_encoding,
+				"utf-8",
+				$msg['name']
+			);
+
+			// Process message body
+			if ($messages[$key]['kind'] == self::KIND_PLUGIN) {
+				// Treat plugin message body as an associative array
+				$messages[$key]['message'] = unserialize(
+					$messages[$key]['message']
+				);
+			} else {
+				// Change message body encoding for core messages kinds
+				$messages[$key]['message'] = myiconv(
+					$webim_encoding,
+					"utf-8",
+					$msg['message']
+				);
+			}
+
 			// Get last message ID
 			if ($msg['id'] > $last_id) {
 				$last_id = $msg['id'];
@@ -696,11 +721,24 @@ Class Thread {
 	/**
 	 * Send the messsage
 	 *
+	 * Message body, passed as $message argument can be either string or
+	 * associative array. It depends on $kind argument value.
+	 * If $kind equals to Thread:KIND_PLUGIN $message must be an associative
+	 * array with following keys:
+	 *  - 'plugin': string, name of the plugin which send the message;
+	 *  - 'data': associative array, arbitrary message data.
+	 * Message body in this case will automatically serialized and unserialized
+	 * then it needed.
+	 *
+	 * On the other hand, if $kind argument NOT equals to Thread::KIND_PLUGIN
+	 * $message must be a string, representing message text.
+	 *
 	 * @param int $kind Message kind. One of the Thread::KIND_*
-	 * @param string $message Message body
+	 * @param string|array $message Message body
 	 * @param string|null $from Sender name
 	 * @param int|null $opid operator id. Use NULL for system messages
-	 * @param int|null $time unix timestamp of the send time. Use NULL for current time.
+	 * @param int|null $time unix timestamp of the send time. Use NULL for
+	 * current time.
 	 * @return int Message ID
 	 *
 	 * @see Thread::KIND_USER
@@ -709,6 +747,7 @@ Class Thread {
 	 * @see Thread::KIND_INFO
 	 * @see Thread::KIND_CONN
 	 * @see Thread::KIND_EVENTS
+	 * @see Thread::KIND_PLUGIN
 	 * @see Thread::getMessages()
 	 */
 	public function postMessage($kind, $message, $from = null, $opid = null, $time = null) {
@@ -718,6 +757,12 @@ Class Thread {
 			"(threadid,ikind,tmessage,tname,agentId,dtmcreated) " .
 			"VALUES (:threadid,:kind,:message,:name,:agentid,:created)";
 
+		// Serialize message body for messages with kind equals to
+		// Thread::KIND_PLUGIN
+		if ($kind == self::KIND_PLUGIN) {
+			$message = serialize($message);
+		}
+
 		$values = array(
 			':threadid' => $this->id,
 			':kind' => $kind,