diff --git a/apps/conference/Conference.cpp b/apps/conference/Conference.cpp
index 4cabfdf7..303495d6 100644
--- a/apps/conference/Conference.cpp
+++ b/apps/conference/Conference.cpp
@@ -71,6 +71,8 @@ string ConferenceFactory::DialoutSuffix;
 PlayoutType ConferenceFactory::m_PlayoutType = ADAPTIVE_PLAYOUT;
 unsigned int ConferenceFactory::MaxParticipants;
 
+bool ConferenceFactory::UseRFC4240Rooms;
+
 #ifdef USE_MYSQL
 mysqlpp::Connection ConferenceFactory::Connection(mysqlpp::use_exceptions);
 
@@ -291,6 +293,9 @@ int ConferenceFactory::onLoad()
     ERROR("while parsing max_participants parameter\n"); 
   }
 
+  UseRFC4240Rooms = cfg.getParameter("use_rfc4240_rooms")=="yes";
+  DBG("%ssing RFC4240 room naming.\n", UseRFC4240Rooms?"U":"Not u");
+
   return 0;
 }
 
@@ -302,7 +307,21 @@ AmSession* ConferenceFactory::onInvite(const AmSipRequest& req)
     DBG("Conference is full.\n");
     throw AmSession::Exception(486, "Busy Here");
   }
-  return new ConferenceDialog(req.user);
+
+  string conf_id=req.user;
+
+  if (UseRFC4240Rooms) {
+    // see RFC4240 5.  Conference Service
+    if (req.user.length()<5)
+      throw AmSession::Exception(404, "Not Found");
+    
+    if (req.user.substr(0,5)!="conf=")
+      throw AmSession::Exception(404, "Not Found");
+
+    conf_id = req.user.substr(5);
+  }
+
+  return new ConferenceDialog(conf_id);
 }
 
 AmSession* ConferenceFactory::onRefer(const AmSipRequest& req)
@@ -351,8 +370,7 @@ ConferenceDialog::~ConferenceDialog()
 #endif
 }
 
-void ConferenceDialog::onStart() 
-{
+void ConferenceDialog::onStart() {
 }
 
 void ConferenceDialog::onSessionStart(const AmSipRequest& req)
diff --git a/apps/conference/Conference.h b/apps/conference/Conference.h
index 01bf731c..ea88018b 100644
--- a/apps/conference/Conference.h
+++ b/apps/conference/Conference.h
@@ -83,6 +83,8 @@ public:
   static string DialoutSuffix;
   static PlayoutType m_PlayoutType;
   static unsigned int MaxParticipants;
+  static bool UseRFC4240Rooms;
+
 
 #ifdef USE_MYSQL
   static mysqlpp::Connection Connection;
diff --git a/apps/conference/etc/conference.conf b/apps/conference/etc/conference.conf
index 02cbea38..51d21f97 100644
--- a/apps/conference/etc/conference.conf
+++ b/apps/conference/etc/conference.conf
@@ -22,3 +22,14 @@ playout_type=adaptive_playout
 # Maximum number of participants in a conference
 # default = 0 (unlimited)
 #max_participants=10
+
+# use_rfc4240_rooms=[yes|no]
+#
+# RFC4240 specifies for Conference service that the conference 
+# room is specified in the user part of the Request URI as:
+#  sip:conf=uniqueIdentifier@mediaserver.example.net
+# If the conference-id is empty, a 404 is returned.
+#
+#default:
+# use_rfc4240_rooms=no
+#
\ No newline at end of file