diff --git a/coreapi/bellesip_sal/sal_op_impl.c b/coreapi/bellesip_sal/sal_op_impl.c
index 41572caa9..625cc6ef4 100644
--- a/coreapi/bellesip_sal/sal_op_impl.c
+++ b/coreapi/bellesip_sal/sal_op_impl.c
@@ -250,7 +250,8 @@ int sal_op_send_request(SalOp* op, belle_sip_request_t* request)  {
 	if (strcmp(belle_sip_request_get_method(request),"INVITE")==0
 			||strcmp(belle_sip_request_get_method(request),"REGISTER")==0
 			||strcmp(belle_sip_request_get_method(request),"SUBSCRIBE")==0
-			||strcmp(belle_sip_request_get_method(request),"OPTIONS")==0)
+			||strcmp(belle_sip_request_get_method(request),"OPTIONS")==0
+			||strcmp(belle_sip_request_get_method(request),"REFER")==0) /* Despite contact seems not mandatory, call flow example show a Contact in REFER requests*/
 		need_contact=TRUE;
 
 	return _sal_op_send_request_with_contact(op, request,need_contact);
diff --git a/mediastreamer2 b/mediastreamer2
index ff9b20e9f..ff71abf33 160000
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit ff9b20e9fbccb0c3ca401544d2cdc39dd8ee629e
+Subproject commit ff71abf33ae17a2f1221514f3fa7a7fec54c2168