I've been trying to troubleshoot a setup that was working at one point and since stopped. Client has a SV8100 with a remote phone that connects over VPN and is working. They also have a few remote users that have u-Mobility (firewall is a Cisco ASA with the following ports forwarded to phone system: udp/5070,udp/5080-1,udp/10020-10051,udp/10052-10083,udp/15061.

Android phones seem to work fine when offsite, but iPhones seem to register without and issue and can make calls, but there isn't any audio on the call. Doing a capture at the firewall I see the inbound audio from the iPhone being forwarded to the phone system but users in the office never hear anything. I don't believe there is any ringback either on the calls to the iPhone. I'm trying to setup a side by side test of an Android device and an iPhone but looking for ideas that i might have missed.

This was working properly initially but it was reported that it stopped after the internal addresses on the LAN changed.