Stale SIP Sessions

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Stale SIP Sessions

Hello all,

 

We seem to have an issue with sip sessions being stuck in the session monitor for weeks and sometimes months.  There have been instances, albeit extremely rare, where it prevented new sessions from being formed on a sip trunk we were testing (it's being moved off of the firewall for production).  Once I cleared the stuck session we were able to make calls again.  The phones themselves are Polycom.  I have ALG turned off on all firewalls and the sip application timeout has been adjusted from 3600 seconds to 20 seconds.  The timeout adjustment seemed to help but I still see stuck sessions every so often.  Anything else that can be checked or adjusted?  I'm not much of a phone system expert so this is a little out of my realm.

 

stalesessions.pngstalesessionssip.png

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