Forum Discussion
AudioCodes, Avaya, Media Bypass, and BackToBackBypass offer was declined by Peer
jangliss I don't have a solution, but I'm here to report the similar problem. I don't know if there is Avaya at the other end of this, because that particular call is connected to PSTN network, but the extra INVITE coming the other direction and BackToBackBypass error message are the same symptoms in my case, too. So if anybody else experienced that or found a solution to that, it would be nice to know. Thanks.
I should add, when I had this issue with a customer that was using PSTN, we ended up adding another IP Group and Proxy Set on the AudioCodes SBC that was used as an intermediary between the SIP connection to MS Teams and the Gateway functionality on the AudioCodes. The call route essentially ended up looking like:
Teams -> SBC -> SBC IP Group -> SBC Gateway -> PSTN
This resolved the issue because the extra SIP handoff allowed the AudioCodes to correctly handle the headers.