[asterisk-users] No audio on Zap (T1/PRI) channels

[Steve Totaro]

Steve Edwards wrote:
> On Wed, 3 Oct 2007, Steve Totaro wrote:
>
>   
>> Steve Edwards wrote:
>>     
>>> I have 12 T1's going into 3 servers, 4 in each into "Digium, Inc. Wildcard
>>> TE410P Quad-Span togglable E1/T1/J1 card 3.3v (rev 02)" cards.
>>>
>>> Each "group" of T1's have the primary D on 24 and the secondary D on 96.
>>>
>>> The first server (ts20) and the last server (ts22) can playback
>>> "demo-congrats" fine. The "middle" server (ts21) cannot -- just dead air.
>>>
>>> If I call via ZAP, dead air. If I call via IAX, I hear the file.
>>>
>>> I copied /etc/zaptel.conf, /etc/asterisk/*,
>>> /var/lib/asterisk/sounds/demo-congrats.gsm from ts20 to ts21 -- no joy.
>>>
>>> I have seen this in my system log file:
>>>
>>> Oct 2 18:41:49 WARNING[7477]: chan_zap.c:8087 zt_pri_error: [Span 0
>>> D-Channel 0] PRI: !! Got reject for frame 95, but we have nothing --
>>> resetting!
>>>
>>> I'm running asterisk-1.2.24, asterisk-addons-1.2.7, libpri-1.2.5,
>>> zaptel-1.2.20.1.
>>>
>>> "show channel zap/?," "zap show channel ?" appear identical between
>>> working and non-working systems both "on-hook" and "off-hook."
>>>
>>> Any clues or clues where to start looking?
>>>       
>
>   
>> Double check both zaptel.conf and zapata.conf and also call the telco to
>> make sure they have they have the same NFAS scheme on all T1s setup
>> correctly.  Sometimes (let's face it, alot of times, the provider messes
>> something up).
>>
>> Also check that all of your T1 cables are plugged into the correct T1
>> port.  I have made that mistake myself when doing 28 T1s off a T3.  I
>> got dead air just as you described.
>>     
>
> I think this is the problem, or at least "a" problem.
>
> When Qwest pointed a number to the group, I noticed that calls arrived on 
> ascending channel numbers. I observed...
>
>  	Accepting call from '202239xxxx' to '866205xxxx' on channel 0/1, span 1
>  	Executing Answer("Zap/1-1", "") in new stack
>
> So it looks to me like the T1 that is plugged into the second jack on the 
> card really belongs in the 4th jack. Can I fix this by munging my 
> configuration? (I'm in San Diego and the servers are in Phoenix.)
>   
I guess you could work around it by messing with your configuration and 
changing channel numbers and putting your backup D on the correct 
channels. 

I would highly advise against it though.  You should call someone in 
Phoenix (just left there) and have them correct the cabling so it is 
done the proper way.  Even if you do get it working with the channels 
all mangled out of order, it will bite you sometime down the road (or 
someone else) when some sort of problem arises and you are trying to 
troubleshoot it.

Thanks,
Steve Totaro