audio.sip.SessionExpires

Specifies the time, in seconds, at which the side set by audio.sip.SessionTimerMode pings the other side to see if it is active or not. This is also the time the other side expects to receive a ping. The default is 1800. The minimum is 90. Both values are recommended by RFC 4028. Set to 0 to disable the timer.

• If the sending side does not get a response to a ping, it sends a BYE to the other side to hang up the call.
• If the receiving side does not get a ping in the time specified, it sends a BYE to hang up the call.

See RFC 4028 for more information about session timers.