Hi, I have provisioned a YL T46 successfully. The account is however not registered. I have set a unique SIP Port 5062 both on 3CX and in the phone. This port (TCP / UDP) is forwarded in the router to the IP of the phone. Als the RTP Ports (UDP 9000-9014) are forwarded. Username, Auth-ID are "110", Password is correct. Transport protocoll is UDP. What can be the reason of being not able to register? I would generally use TLS. Which port hast to be used for it. Do I understand correctly the each phones have to have unique SIP and RTP Ports, correct? Thank you very much for your feedback. Best regards I.