[asterisk-users] modem through Zaptel/Digium?

[Steve Totaro]

On Jan 17, 2008 1:28 PM, Jeremy Mann <jmann at txhmg.com> wrote:

> Is it bridging the Zap channels?  We have asterisk doing FXO-FXS modem
> calls working fine, the key is making sure the channels are bridging and EC
> is NOT turning on.  If you have anything preventing that the modem calls
> won't work.
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] On Behalf Of Dave Fullerton
> Sent: Thursday, January 17, 2008 12:05 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] modem through Zaptel/Digium?
>
> Greg Woods wrote:
> > This is just a low priority curiosity question because I have a usable
> > workaround.
> >
> > I have  Digium card that uses the Zaptel driver (can't get to my home
> > machine right now to get the exact model, but it probably doesn't
> > matter). It's a card with one POTS line and three extension hookups. I'm
> > using Asterisk 1.4 and Zaptel 1.4.7 .
> >
> > One of the extension ports is connected to a modem on another computer.
> > This is a FAX modem that works well; I have * programmed to detect
> > incoming faxes and route them to this modem, and it works seamlessly. I
> > can also send outbound faxes with no problem.
> >
> > The curiosity is that this modem does not work for dialup unless I
> > bypass the * server and connect it directly to the wallplate, then it
> > works fine. I don't see why it would be able to detect carrier and
> > negotiate with a fax machine through * and Zaptel, but not with a dialup
> > server.
> >
> > --Greg
>
> I think asterisk has the ability to detect fax tones and disable echo
> cancellation for those calls. I don't know if that is the case with a
> regular modem call. I'd check to make sure that echo cancellation is
> disabled on the extension the modem is plugged into. The only other idea
> is to try connecting at a lower speed (I would think this would happen
> automatically though).
>
> -Dave
>

Try setting the modem to 9600 baud.  It will probably work.

Thanks,
Steve Totaro
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