Quote Originally Posted by fisamo View Post
Oops--I meant G711u, not G722u. The problem I'm having is that at least one of the media gateways my calls connect to does not accept G.711u but seems to require G.729 instead. I configured my trunk (briefly) to use ONLY G.729, and calls to my mobile phone worked, but then calls to several other numbers failed (which was expected behavior). Allowing both CODECs seemed to cause a 'battle of the codecs' based on my Asterisk log, and although the call stayed connected, no audio was transmitted. (I included a snippet of my logs in my ticket.)

Is it possible that there are some 'rogue gateways' that are causing this intermittent problem for other users?
The only thing I could think of would be peering. All the primary trunks are def 711 enabled. Can you send me some numbers you've seen this message on so I can see how they are routing out? If already in ticket, a ticket number is fine.