we have an issue with SNR where there is no ringback when the Remote Destination (cell phone) is ringing. Once the call connects, the audio is fine. The cell phone rings, but the caller does not hear ringback.
Here is the call flow:
PSTN --> CMM (H323) --> UCM 6.1 --> IP Phone/Remote Destination --> 2811 (H323) --> PSTN.
We have several users with the same config, but not all of them have the ringback issues.
We just fixed an issue on the CMM with one-way or no audio, but disabling CEF. The 2811 still have CEF enabled, could that cause the issue?