I have two servers running Asterisk 126.96.36.199. All of my handsets receive DHCP, their configurations, and register with SERVER_1. My PRI lines are connected to SERVER_2 via a 2-port PRI card. SERVER_2 communicates to SERVER_1 via IAX. SERVER_2 is just a gateway. No SIP devices register with it and it does not handle any services outside of facilitating connections to and from the PRIs.
When Asterisk tries to play a recorded sound for an external caller (voicemail greeting or any other sound, to a caller from outside of the local server), the external caller only hears silence and Asterisk hangs on that step of the call process. Meaning that it doesn’t just keep playing silently through the menu prompts (in the case of voicemail). There are no errors logged to the Asterisk “messages” or “full” log files.
Local callers (originating from the local server) will hear the sound just fine and voicemail will progress through the prompts as it should.
Both incoming and outgoing voice calls function correctly. Only the playback of recordings (and other sounds) seems to be affected. I have a feeling that this is somehow a codec issue with either the IAX connection between my two servers or a codec issue with my connection to the PRIs, but I have not been able to track that down.
I have configured the iax.conf on both servers to “bandwidth=high” and “allow=all” (probably redundant).
To eliminate voicemail from being the problem, I have configured an extension to simply answer and play a sound (Playback(tt-weasels)) before hanging up. Calls to that extension from another local extension have the sound played back to them and then have the call hung up. Calls to that extension from outside (originating from the PRIs) get only silence, and the call never gets to the “hangup” step.
If anyone has any ideas for me to try next, I would love to hear them!