[cisco-voip] Intermittent call failure on QSIG trunk

[Sechaba Mokoena]

Hi Wes,

The B-Channels on my router are all in service, the only problem is that I
don't have visibility on the Alcatel PABX, we are making arrangements with
the vendor to investigate. We have access to all 30 channels on the PRI from
what I understand. We'll have a look at the channel selection order on the
Alcatel PABX. Thanks for the assistance.

Kind regards,

Sechaba Mokoena

On Wed, Oct 14, 2009 at 4:39 PM, Wes Sisk <wsisk at cisco.com> wrote:

>  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> <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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