Re: [LUG] asterisk dahdi issues

[Gordon Henderson <gordon+dcglug@xxxxxxxxxx>]

On Wed, 12 Oct 2011, stinga@xxxxxxxxxxxxx wrote:

> On 12/10/11 16:24:00, Gordon Henderson wrote:
> > On Wed, 12 Oct 2011, stinga@xxxxxxxxxxxxx wrote:
> >
> > > After working for about 12 months one of my incoming BT lines no longer 
> > > works.
> > >
> > > Connected to Asterisk 1.6.2.7 currently running on pbx (pid = 17274)
> > > digium tdm400
> > >
> > > Incoming call
> > > [Oct 12 15:54:07] NOTICE[17983]: chan_dahdi.c:8436 ss_thread: Got event 17 
> > > (Polarity Reversal)...
> > > [Oct 12 15:54:09] WARNING[17983]: chan_dahdi.c:8497 ss_thread: CID timed 
> > > out waiting for ring. Exiting simple switch
> > >
> > > I get the above and nothing happens
> > Have you tried plugging a normal phone into it?
> Yes, works fine
>
> > Dial the BT test code - 17070.
> Done and works fine, ring back works, phone rings, well one does another I 
> have does not.
>
> > > The hookstate is different, onhook vs offhook
> > >
> > > swapping the lines over on the tdm400 gives the same results but different 
> > > channel numbers.
>
> > It's really rubbish. You probably don't have enough line voltage for it to 
> > register. Zaptel was better (IME)
> I agree!
>
> > Do the regular phone test - try option 1 too - ringback. Make sure a normal 
> > phone rings at full oomph.
> Well it all sounds ok, bit difficult to tell with new phones.
>
> Also found...
> [root@pbx asterisk]# cat /proc/dahdi/1
> Span 1: WCTDM/4 "Wildcard TDM400P REV I Board 5" (MASTER)
>
>            1 WCTDM/4/0 FXOKS (In use) (SWEC: MG2)
>            2 WCTDM/4/1 FXOKS (In use) (SWEC: MG2)
>            3 WCTDM/4/2 FXSKS (In use) (SWEC: MG2)
>            4 WCTDM/4/3 FXSLS (In use) RED(SWEC: MG2)
>
> I tried loopstart here as I saw website with this, I am now back to ks.

KS is what you want in the UK... While the line is technically a 
loop-start line (ie. you loop or virtually short circuit it to make it go 
"live"), KS generally seems to work better.

I see:

           4 WCTDM/4/3 FXSKS (In use) RED(SWEC: OSLEC)

with an analogue line unplugged and,

           4 WCTDM/4/3 FXSKS (In use) (SWEC: OSLEC)

with one plugged in, so somethings working... (ie. not RED), but I've 
absolutely no idea what it uses to detect red alarm on the analogue line.

I have seen TDM400 cards (or rather the modules) get screwed over with 
lightening though - had any down there recently?

Or maybe it's just the DACS. Horrible stuff analogue. Just port to VoIP 
and be done with it.

Gordon

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