[cisco-voip] Intermittent call failure on QSIG trunk

[Wes Sisk]

So either an invalid channel was selected or one was selected that was 
already in use.
invalid channel - only reason this typically happens is that B-channels 
are taken out of service. Are the b-channels out of service for some 
reason? is this a fractional PRI where only some b-ch are used?
already in use - this is called "collision" and is usually mitigated by 
using opposing channel selection order on the CO and provider 
equipment.  One does top down, the other bottom up.

observing 'debug isdn q931' for a while prior to the error would allow 
you to track the state of things and clarify why the error is happening.

/wes

On Wednesday, October 14, 2009 10:27:29 AM, Sechaba Mokoena 
<sechabam at gmail.com> wrote:
> Hi,
>
> I have a 3825 router connected to a Siemens HiPath PABX with a QSIG. 
> My Cisco IP Phones place calls to the PSTN though the QSIG trunk. I've 
> been having intermittent errors with placing calls through the trunk, 
> and I've picked up the following error through debugs:
>
> **ERROR**: CCPMSG_OutCall: fails with cause 0x22
> Cause i = 0x80A2 - No circuit/channel available
>
> I don't think its over utilization, I checked the channels in use and 
> only a third were active. Does anyone know what could be causing this.
>
> Kind regards,
>
> Sechaba Mokoena
>
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