[Asterisk-Users] Voice Modem + Soundcard Driver

[Anthony Wood]

On Tue, Jun 03, 2003 at 11:09:28AM +0300, Dan wrote:
> Hi,
> 
> I have an USB voice modem which does not need to be connected to the
> soundcard in order to build an answering machine.
> It appear in the system as another sound card.
> I have tested a free Answering machine application and it works great.
> The modem is very cheap (paid around 25 USD for it) and has linux drivers,
> including the source files:
> http://www.smlink.com/products/SmartUSB56.htm for description
> and
> http://www.smlink.com/download/Linux/slmdm-2.7.14.tar.gz
> for the linux driver, including source files.
> 
> Can this be used as a FXO interface for Asterisk?

The key is can the modem do full-duplex voice (sound in both directions
at the same time).  An answering machine is half-duplex:
first, the sound is sent from the machine to the caller,
then, the sound is sent from the caller to the machine.

Also, I don't think Asterisk has drivers for this sort of thing,
as most of the hardware is half-duplex.

But I am only a newbie.

cheers,
Woody

> 
> Best regards,
> Dan
> 
> ----- Original Message ----- 
> From: "Mathew Frank" <mathewfrank at qushi.com>
> To: <asterisk-users at lists.digium.com>
> Sent: Tuesday, June 03, 2003 10:47 AM
> Subject: Re: [Asterisk-Users] Voice Modem + Soundcard Driver
> 
> 
> > > The problem with using Voice Modems is that they fall into two
> categories:
> > >
> > > 1) Hardware Modems which only have half-duplex transmission of voice
> > > 2) Soft/Win/Lin modems which are proprietry and don't have asterisk
> > drivers
> >
> > or 3 - full duplex "real" voice modems such as produced by Banksia in
> Sydney
> > which have been available for years for IVR systems for which only a
> > single-duplex channel is available in Asterisk.
> >
> > > 2 Phone lines
> > > 2 Banksia Wave SP 336 Modems - these have 3.5mm female jacks for
> > speaker/microphone
> > > 1 Full Duplex Soundcard
> > > 4 3.5mm mono male-male audio cables
> > > 2 3.5mm stereo male -> 3.5mm female left + 3.5mm female right adapters
> > > 1 Linux Box with 2 serial ports and spare PCI slot for Full Duplex sound
> > card.
> > > Asterisk
> > > Programmer
> >
> > I had concidered such an approach, till I remembered the iNTRA modems
> > mentioned above.   There is actually a question re legality of wiring the
> > sound card to the modem - or even audio-coupling to do the same according
> to
> > the wording of the rules AFAIK.   Anyway I did concider your suggestion
> and
> > when I posted it a year ago got in an argument with a fellow poster who
> > missed my point entirely till the point was lost.
> >
> > Mathew
> >
> > _______________________________________________
> > Asterisk-Users mailing list
> > Asterisk-Users at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-users
> >
> >
> 
> 
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-- 
Woody