--- a/src/plugins/plugin_xep_0045.py	Fri Jan 05 12:58:54 2018 +0100
+++ b/src/plugins/plugin_xep_0045.py	Fri Jan 05 12:59:52 2018 +0100
@@ -88,6 +88,7 @@
         host.bridge.addMethod("mucGetUniqueRoomName", ".plugin", in_sign='ss', out_sign='s', method=self._getUniqueName)
         host.bridge.addMethod("mucConfigureRoom", ".plugin", in_sign='ss', out_sign='s', method=self._configureRoom, async=True)
         host.bridge.addMethod("mucGetDefaultService", ".plugin", in_sign='', out_sign='s', method=self.getDefaultMUC)
+        host.bridge.addMethod("mucGetService", ".plugin", in_sign='ss', out_sign='s', method=self._getMUCService, async=True)
         host.bridge.addSignal("mucRoomJoined", ".plugin", signature='sa{sa{ss}}sss')  # args: room_jid, occupants, user_nick, subject, profile
         host.bridge.addSignal("mucRoomLeft", ".plugin", signature='ss')  # args: room_jid, profile
         host.bridge.addSignal("mucRoomUserChangedNick", ".plugin", signature='ssss')  # args: room_jid, old_nick, new_nick, profile
@@ -109,7 +110,7 @@
     def profileConnected(self, client):
         def assign_service(service):
             client.muc_service = service
-        return self.getMUCService(profile=client.profile).addCallback(assign_service)
+        return self.getMUCService(client).addCallback(assign_service)
 
     def MessageReceivedTrigger(self, client, message_elt, post_treat):
         if message_elt.getAttribute("type") == C.MESS_TYPE_GROUPCHAT:
@@ -359,15 +360,27 @@
         self.checkRoomJoined(client, room_jid)
         return client._muc_client.joined_rooms[room_jid].inRoster(muc.User(nick))
 
+    def _getMUCService(self, jid_=None, profile=C.PROF_KEY_NONE):
+        client = self.host.getClient(profile)
+        d = self.getMUCService(client, jid_ or None)
+        d.addCallback(lambda service_jid: service_jid.full() if service_jid is not None else u'')
+        return d
+
     @defer.inlineCallbacks
-    def getMUCService(self, jid_=None, profile=C.PROF_KEY_NONE):
+    def getMUCService(self, client, jid_=None):
         """Return first found MUC service of an entity
 
         @param jid_: entity which may have a MUC service, or None for our own server
-        @param profile: %(doc_profile)s
+        @return (jid.JID, None): found service jid or None
         """
-        client = self.host.getClient(profile)
-        muc_service = None
+        if jid_ is None:
+            try:
+                muc_service = client.muc_service
+            except AttributeError:
+                pass
+            else:
+                # we have a cached value, we return it
+                defer.returnValue(muc_service)
         services = yield self.host.findServiceEntities(client, "conference", "text", jid_)
         for service in services:
             if ".irc." not in service.userhost():