[Freeswitch-users] how to use codec g729 on freeswitch ?

[Paul Cupis]

First call:

FreeSWITCH 192.168.10.70 send invite to 140112971507247227 at 85.15.0.154
  offers: m=audio 26616 RTP/AVP 9 0 8 18 3 101 13
Cisco 85.15.0.154 replies with 18/SDP: m=audio 18218 RTP/AVP 0 13 101
Cisco 85.15.0.154 replies with 500 Internal Server Error

Second call:

FreeSWITCH 192.168.10.70 send invite to 140112971507247227 at 85.15.0.154
  offers: m=audio 25814 RTP/AVP 18 101 13
Cisco 85.15.0.154 replied with 488 Not Acceptable Media

Your Cisco is either misconfigured or is rejecting the INVITE/SDP from 
FreeSWITCH - you'll need to check the logs on the Cisco to see why.

You should try Stevens suggestion of verbose_sdp=true and do the same 
two tests, but it looks like your Cisco should be happy to set the call 
up as G711 (PCMU) or G729 if you can get it to accept the INVITE/SDP.

Regards,