Line some times disconnects 1-3sec after resuming from hold

[Frank Hoeben]

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).

CUCM 10.5.2.15900-8

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.

[HARIS_HUSSAIN]

Please collect SIP Logs with debug ccsip messages command from VG.

[Dennis Mink]

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

[Frank Hoeben]

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.