[OpenSIPS-Users] Session expires, calls disconnect

joel.oliveira joel.oliveira at interacesso.pt
Tue Nov 15 19:28:23 CET 2011

On a side note it's important to know the difference between Min-SE, Expires
and Session-Expires headers.

A quick, and maybe naive point of view, is:
. Min-SE : minimum Session-Expires value that should be use while
negotiating with this UAC, a UAC recieving this should change it's
Session-Expires so it can be bigger or equal to the requested Min-SE
. Session-Expires : value of Session-Expire requested by this UAC, how much
time will the Session be up
. Expires : time of expiration that the current SIP message has

On the "who sends what to whom" question it's better if you just do a sip
trace and understand how it goes. I may be wrong but as I recall it's the
"refresher" attribute of the Session-Expires header that controls who's
supposed to do the Re-Invite. 

I started some threads regarding Session-timers, some read on that can help
your ( or maybe not :D ), either way it'll not hurt:

Best Regards,

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