Just in media gateway i did invoice service voip sip bind all source-interface Loopback0where the loopback0 had the ip source of trunk.with debug ccsip messageyou can watch the ip local of sip trunk, and the dial-peer you put the ip remote

can you put the ephone and ephone-dn configure, because you can configure the codec on phone.I think that is problem of codec, and i didnt see the transcoding

Hi,you need to check the codeci didnt see your codeci think that you can make call, and the phone ring, but when you hang up, the call end, maybe this is the problem, or you have to check the rtp packets.