[cisco-voip] H323 gateway question/problem

[Patrick Diener]

try to find out which end is dropping (releasing) the call (Gateway or
CallManager) and for what reason (h225 q931 cause code)

use "debug h225 q931" on the gateway to get this info...

Regards
Patrick

On 8/16/07, Ed Leatherman <ealeatherman at gmail.com> wrote:
> Hi Folks,
>
> I'm pretty rusty on my H.323 gateways and dial peers etc, running into a
> problem with a configuration in my lab that i'm hoping to use this Fall for
> a project - was hoping someone might have an idea.
>
> Goal here is to have a router with CME setup for "SRST Mode" and a number of
> POTS lines in from pstn. Phones normally registered to callmanager (version
> 4.2 in my lab). During normal operation, if any of those lines ring, it
> should just connect to call manager and ring a shared line appearance on X
> number of phones at the location (probably about 8). During SRST operation,
> essentially I want to do the same thing - using overlays etc.
>
> I have the CME up and seems to work OK. The problem I have is during normal
> operation. Any 1 line can ring in and it gets sent to call manager and the
> correct line rings on all phones. Any other line that rings in after that
> appears to get sent to call manager, the line rings once, and then the call
> drops. It seems to me that perhaps something in the feature negotiation
> phase is failing, since the call rings out once before failing. I dont have
> any CAC setup, and its all using G.711ulaw. I don't know enough about H323
> to know where to look next though - nothing in the debugs I looked at jumped
> out at me as an error.
>
> I did watch the debug for dial-peer matching and it looks to be matching my
> dial-peer out to CCM before it matches the ephone-dn dial peers
>
> router is basically setup like this:
>
> voice-port 0/0/0
>  connection plar 37111
> voice-port 0/0/1
>  connection plar 37111
> voice-port 0/0/2
>  connection plar 37111
> !
> dial-peer voice 100 voip
>  destination-pattern 37111$
>  session target ipv4:10.182.140.10  ! Call Manager 4.2
>  no vad
>  codec g711ulaw
> !
>
> I found that if I dont put the end of string marker in my destination
> pattern, it likes to match the ephone-dn's before it matches the callmanager
> dial-peer.
>
> Thanks!
> --
> Ed Leatherman
> Senior Voice Engineer
> West Virginia University
> Telecommunications and Network Operations
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