add rtp endpoint contributed by sangoma

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -5705,6 +5705,8 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_sofia_load)
 	SWITCH_ADD_API(api_interface, "sofia_dig", "SIP DIG", sip_dig_function, "<url>");
 	SWITCH_ADD_CHAT(chat_interface, SOFIA_CHAT_PROTO, sofia_presence_chat_send);
 
+	crtp_init(*module_interface);
+
 	/* indicate that the module should continue to be loaded */
 	return SWITCH_STATUS_SUCCESS;
 }