[asterisk-users] Disappearing B-Channels

[Mark Greene]

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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