[Asterisk-Users] Connection TDM400P to UK PSTN (Gains and Impedance)

[Chris Earle (CBL)]

re: setting zaptel to UK mode
Yes, I've set the tonezone, and also when loading the module have set it to
OPERMODE=UK
Looks like that is working

A few ideas:  *Maybe* the opermode code in the zaptel drivers isn't actually
working ? Meaning, maybe it's saying it's in UK mode but actually isn't?  Is
there any way to know really?

Another question:
Is it possible to run the CVS-HEAD/Stable version of Zaptel (1.2 whatever)
with an older version of Asterisk? I'm running 1.09, but I was wondering if
I could get at the newer echo cancellers like KB1 and MG2 without upgrading
to Asterisk 1.2?

Thanks for your suggestions everyone

Chris


----- Original Message ----- 
From: "Tzafrir Cohen" <tzafrir at cohens.org.il>
To: "Chris Earle (CBL)" <cearle at cbltech.ca>
Sent: Thursday, January 19, 2006 1:02 PM
Subject: Re: [Asterisk-Users] Re: Connection TDM400P to UK PSTN


> On Thu, Jan 19, 2006 at 11:30:25AM -0500, Chris Earle (CBL) wrote:
> > Okay, sorry to hash out this discussion again, but it's starting to
drive me
> > crazy
> >
> > Successfully got the adapters to allow the BT phones to ring on lines
coming
> > out of a TDM.......... but now my latest problem is echo.
> >
> > I have done tweaking of the gains in North and South America, and after
a
> > bit of work have gotten echo to go away, but this seems to just not want
to
> > go away.
> >
> > On an incoming call from the POTS, everything on my end sounds perfect,
> > but on the internal extension phone, there is an echo when you speak.
An
> > almost perfect copy of what you say.  If I turn down the gains on that
> > channel, it doesn't seem to do much, or causes other volume issues.
> >
> > Help!
> >
> > In my research and hunting, I am starting to worry that the US-bought
digium
> > cards have IMPEDENCE issues in the UK with the BT Lines etc?  That would
> > seem to explain why the echo is so incessant.  I have even tried
changing
> > Echo Cancellers to MARK3.
> >
> > Right, this is Asterisk 1.0.9, Zaptel 1.0.9.2 on Debian
> >
> > Suggestions / Experiences in UK appreciated
>
> Not sure, but if the card is recent, then its impedence values and such
> should be configurable.
>
> For starters, set the tonoezone (both of them) to "uk" in zaptel.conf
> and re-run ztcfg .
>
> Try to see what exactly is the model of your card and your firmware. I'm
> not sure how to check this. Maybe ask Digium support.
>
> -- 
> Tzafrir Cohen         | tzafrir at jbr.cohens.org.il | VIM is


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