[cisco-voip] Trying to track down a dropped call...

[Ahmed Elnagar]

Hello;
I had a similar Problem but not realted to IPCC at all. I have a PSTN gateway softswich system (PGW). I can give u some clues. try to know which party is closing the call by looking at the dest_cause and orig_cause of the CDR of the call @ CM and see what that cause means. my problem was that I had a server (involved in call processing) that have 2 network interfaces and they was not configured correctly to run with each other, so the call drop disappers when I remove one of the cables. I know maybe my case is a differenet one but just wanted to help.
 
Thanks and Best Regards

Ahmed A. Elnagar
Network Field Engineer
 
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt 
Postal Code:12411 Cairo Egypt

Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar at act-eg.com

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of Ed Leatherman
Sent: Thu 29-Mar-07 11:24 PM
To: ciscovoip
Subject: [cisco-voip] Trying to track down a dropped call...


Had a call center agent call in a report on a dropped call.. trying to determine what happened to cause it to drop.

Since this has IPCC involved, I have less of a clue as to whats going on than normal. The first messages that I see in the trace file when the call dropped are: 
03/28/2007 15:45:14.823 CCM|StationD(226): StationCtiD - CtiLineCallDisconnectReq LH=5
03/28/2007 15:45:14.823 CCM|StationD(226): StationCtiD - CtiLineCallDisconnectReq LH=5
03/28/2007 15:45:14.823 CCM|StationD(226): StationCtiD - StationOnHook 
03/28/2007 15:45:14.823 CCM|StationD(226): StationCtiD - StationOnHook
This seems to tell me that either callmanager or ipcc is tearing down the call rather than the agent bumping a button or something... or perhaps the user is doing it via CAD somehow and doesnt know it. I don't see any reset messages in callmanager for that phone to have lost connectivity. 

Then some lines down, 
03/28/2007 15:45:14.823 CCM|StationD:    (0000226) StopTone.
03/28/2007 15:45:14.823 CCM|StationD:    (0000226) SetLamp mode=1, stim=9 stimInst=1.
the the other normal stuff i've seen before when a call shuts down, closes channel, stops transmission,etc. 
Further down it closes out the gateway connection, the PRI message indicates normal call clearing, and it looks like callmanager is closing the MGCP connection.

Does anyone know if there is some place to look for the cause in an IPCC express log? I looked through the MIVR log but nothing jumped out at me.. but i'm not sure what to look for either. 

-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations 
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