We have a problem with the 3CX server changing the SIP headers for a call setup. In the INVITE from the calling device, we have support for session timers "Supported: timer" and "Session-expires: 1800". When the server sends the invite to the receiving client, the session timer support is removed.
Is there a way to avoid changes to the invite message by the server?
Is there a way to avoid changes to the invite message by the server?
Phone System 