[cisco-voip] Dropped calls over ICT and H323 gateway

[Wes Sisk]

CallManager traces.  There is checkbox in RTMT to collect them.

When you setup traces make sure you check the box on the callmanager 
trace configuration page for enable h225 and enable h245 debugs.

Just a few pointers that may come in handy:

1. finding 'dropped' calls in traces is very tedious.  there is 
monumental investment in knowledge to make sense of traces.  If you can 
identify dropped calls in CDR it provides much more rapid problem isolation:
http://supportwiki.cisco.com/ViewWiki/index.php/Dropped_Call_Troubleshooting_in_CUCM

2. we see many dropped calls caused by TCP session aborts.  As h.323 
does not support call preservation by default a TCP session abort of 
either the H.225 session, H.245 session, or an unregistering phone 
device will cause the call to drop.  there were a few traces added to 
help identify some of these cases:

CSCsm26337    need clear messages for h225 tcp session failure
CSCsm26355    need clear messages for h245 tcp session failure

I just updated these so updated information will appear in Cisco Bug 
Toolkit in 24-48 hours.

Regards,
Wes


On Thursday, July 30, 2009 12:06:21 AM , Mike O <mikeeo at msn.com> wrote:
> Hey all Im getting dropped calls across an ICT and H323 gateway, which 
> log do I need to look at in RTMT? I have it all enabled on CM just 
> don;t know which log to download.
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