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

[Matthew Fredrickson]

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?
>>
>> Thanks in advance,
>> ------------------------------------------------------------------------
>> Steve Edwards      sedwards at sedwards.com      Voice: +1-760-468-3867 PST
>> Newline                                             Fax: +1-760-731-3000
>>
>>
>>   
> 
> 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.

Yes, if you are running NFAS, getting dead air on a call is a symptom of 
not having the logical span identifier correctly corresponding to the 
physical span you have plugged in (spanmap option in zapata.conf, IIRC).

-- 
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc.