[cisco-voip] Stuck conferences on 2911

Mon Feb 3 15:08:17 EST 2014

Eric,

The call should stay up if signaling is lost as long as RTP remains active.  There's a "timer receive-rtp" and "timer receive-rtcp" that controls those type of call clearings.  In a case like this though, it's most likely something about the SCCP communication with CUCM that is resulting in the connections on the gateway not being torn down 100%.

Brian

From: Eric Pedersen [mailto:PedersenE at bennettjones.com]
Sent: Monday, February 03, 2014 3:02 PM
To: Brian Meade (brmeade); cisco-voip at puck.nether.net
Subject: RE: Stuck conferences on 2911

Thanks Brian. I'll keep an eye on it. I enabled debugs for sccp events and errors so if it happens again hopefully I'll get some information from the router. I have no idea how long these calls have been there.

Do you know what normal behavior is if communication breaks between a bridge and its CUCM while calls are active? Does the call stay up like a phone to phone call or is it immediately dropped?

Thanks,
Eric

From: Brian Meade (brmeade) [mailto:brmeade at cisco.com]
Sent: 03 February 2014 12:29 PM
To: Eric Pedersen; cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: RE: Stuck conferences on 2911

Eric,

The way I've usually resolved these issues is running the show sccp conn hourly until I can identify a recent inactive resource and then pull the realted CUCM traces and search for those conn_id's until you can find the call that triggered the condition.  Last time I saw this issue, I was able to narrow it down to CSCtx65886 but you should have the fix for that in 9.1.2 so you're probably looking at a different issue.

Brian

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Eric Pedersen
Sent: Monday, February 03, 2014 2:16 PM
To: cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>
Subject: [cisco-voip] Stuck conferences on 2911

We're using 2911s for conferences bridges, and we've been having reports of conferences failing. I looked at one of the routers and it shows inactive connections that never clear:

BH-VOICE-GW1#show sccp conn
sess_id    conn_id      stype mode     codec   sport rport ripaddr conn_id_tx

145723183  134217789    conf  inactive UNKNOWN 23566 0     UNKNOWN
145913733  134269533    conf  inactive UNKNOWN 27940 0     UNKNOWN

Total number of active session(s) 2, and connection(s) 2

The CUCM performance counters show that this gateway has full conference resources available so it doesn't know about these connections. I don't know how long these have been on the router. I saw this on another router. no sccp/sccp cleared them but I'd like to know what the cause is.

Has anyone seen this?

CUCM 9.1(2)SU1 and IOS 15.1(4)M6

Eric

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