vi I have no idea, I was talking with them on the phone and they sad this. Everything with my SIP was okay until 5 day ago and they sad that they have changed something and I have to use some android application Bria that uses g711 codec or I have to use this codec. So do you mean that if the other party needs g711 n900 automatically will use this codec to accomplish this task and I don't have to change something or force it to do so? explain me please