FS-4484 I missed the part about gateways, that is a different story. Try this patch

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -4571,6 +4571,7 @@ static switch_call_cause_t sofia_outgoing_channel(switch_core_session_t *session
 		
 		if (params) {
 			tech_pvt->invite_contact = switch_core_session_sprintf(nsession, "%s;%s", gateway_ptr->register_contact, params);
+			tech_pvt->dest = switch_core_session_sprintf(nsession, "%s;%s", tech_pvt->dest, params);
 		} else {
 			tech_pvt->invite_contact = switch_core_session_strdup(nsession, gateway_ptr->register_contact);
 		}