Situation: user answers phone, puts the caller on hold for 1 to 5 minutes, after resuming the call it disconnects, usually right after the caller hears the user say "thanks for waiting".
The CDR log registers a cause "12" which means the caller hangs up (which they obviously don't).
Cisco 2911 in border element mode connected to a SIP trunk.
The problem happens enough times a day that users complain, but not on every call they put on hold.
is sounds like a timer that expires. i mean do these calls get dropped after a certain amount of time or is it all over the shop? supply sip traces plese
I thought about a timing issue too, but so far I haven't been able to pin-point a source.
The disconnect always takes place after resuming from hold, not while on hold.
And there's always 1 to 3 seconds of audio, which means the call is successfully resumed.
I have tried gathering debug logs, with about 20-30 concurrent calls the router just dies from debug overload.