Hello! I installed the IPhone client. When the IPhone is in the local WLAN everything worked great! When the IPhone is in the Provider net, the Push Notifikation worked (I opened the "APPLE ports") on the Firewall. But the phone is not registeres, that means I can not accept the call, only Push work. What ports must be opened that "only" the IPhone Client worked. I choosed split-DNS on Installation?