[asterisk-users] Disappearing B-Channels

[Kevin Kiely]

Mark,
 
I thought I would also mention that I am still having similar issues even
after updating to the latest Asterisk, Zaptel and Libpri.  Although I am
using a Sangoma, we have similar symptoms with a restart fixing it. I am
starting to wonder if I must go back to a Digium card.  We originally
switched away from the Digium TE110 because of interrupt issues, I think
that the interrupt issue has been remedied now.  
 
  _____  

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Mark Greene
Sent: Sunday, February 10, 2008 11:15 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Disappearing B-Channels
 
I don't think it's my telco, I think it's my TDMoE setup. Does that sound
possible?

I've never had problems with the circuit until I moved it from a standard
digium PRI card to a TDMoE device. 

Also, if I restart asterisk, all the b-channels come back. 

Thoughts?
On Feb 10, 2008 9:40 AM, Tilghman Lesher <tilghman at mail.jeffandtilghman.com>
wrote:
On Sunday 10 February 2008 01:44:38 Mark Greene wrote:
> In my efforts to solve a mystery of asterisk slowly loosing it's ability
to
> take incoming and outgoing calls I set asterisk to restart b-channels
every
> 60 seconds hoping I would find something odd after some time.
>
> So now I am looking at the CLI a few hours later and look what happens
when
> asterisk restarts the 23 b-channels I have.
>
> pbx1*CLI>
>     -- B-channel 0/19 successfully restarted on span 1
>     -- B-channel 0/21 successfully restarted on span 1
>   == Primary D-Channel on span 1 down
> [Feb 10 01:41:23] WARNING[4102]: chan_zap.c:2401 pri_find_dchan: No
> D-channels available!  Using Primary channel 24 as D-channel anyway!
> [Feb 10 01:41:24] ERROR[4102]: chan_zap.c:8200 zt_pri_error: !! Got
S-frame
> while link down
>   == Primary D-Channel on span 1 up
>     -- B-channel 0/19 successfully restarted on span 1
>     -- B-channel 0/21 successfully restarted on span 1
>     -- B-channel 0/23 successfully restarted on span 1
> pbx1*CLI>
>
>
> That's the output while I've been writing this email. Those are TWO
> restarts of the b-channels. Notice I am missing a seizable amount of my 23
> b-channels.
>
> Where are they going?! How do I find out?
>
> I've recompiled my asterisk, zaptel, and libpri to the most recent
versions
> but that's made no difference.
You probably have noise on your T1 circuit, which is causing the PRI
signalling to become corrupt.  If this continues, expect that the T1 circuit
will go down from time to time, for a few seconds each time.  Your solution
is
to call your telco and ask for a loopback test.

--
Tilghman

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