[cisco-voip] Intermittent call failure on QSIG trunk

[Wes Sisk]

If you can capture the q931 debugs that show the requested 
circuit/channel you can have a much more focused discussion with the pbx 
tech.

/Wes

On Thursday, October 15, 2009 3:25:51 AM, Sechaba Mokoena 
<sechabam at gmail.com> wrote:
> 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 
> <mailto: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> <mailto: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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>>       
>
>

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