Session Timer Issue

[Robert Birch]

Hey Guys,

I'm getting a weird error from a soft phone device that is having an issue with a session timer. A call will work, but about 3 minutes into the call, it will ring again. And then disconnect the first call if it isn't answered.

This is the errors I get from the call:

2021-02-16 22:12:31 (UTC), new state => First Invite Sent, accepted => Y
2021-02-16 22:12:31 (UTC), new state => Connecting, accepted => Y
2021-02-16 22:12:31 (UTC)
SIP processing error Invalid argument 422
2021-02-16 22:12:31 (UTC)
Reason header: Q.850 ;cause=127 ;text="e0769e13-fe30-4e34-b9c5-d03232edbd0d;Session Interval Too Small"
2021-02-16 22:12:31 (UTC), new state => Closing Error, accepted => Y
422 Session Interval Too Small

From what the developer says, I need to increase the timer to 300 secs. Here is his response:

Softphone is rejecting the initial timeout and re-negotiating a 300 second timeout. This normally is OK - (We use 90 seconds for some Broadsoft applications that has to negotiate up to 300) - But it appears as though thats also causing your PBX to send a second, completely independent call when that session timeout 50% mark is hit (Where we would normally just see REINVITE or UPDATE type packet to refresh the timer.)

My understanding is this would be in the Internal SIP Profile (??) but I see the minimum-session-expires not set (ie. set to false).

Is that what I would change? Is there any other issues that could happen if I change this value? Everything else works fine. Just this softphone.

Thanks,
Shredder