[Asterisk-Users] Voice Modem + Soundcard Driver

[Anthony Wood]

On Wed, Jun 04, 2003 at 09:15:25AM +0300, Dan wrote:
> Hi Woody,
> 
> As it is a software modem, it can do full duplex.
> .

If it can do full duplex, then no-one has pointed out to me why a
driver can't be written for it.

> > Also, I don't think Asterisk has drivers for this sort of thing,
> > as most of the hardware is half-duplex.
> 
> When asterisk is started, I see something like this in the log:
> 
> [chan_modem_bestdata.so] => (BestData (Conexant V.90 Chipset) VoiceModem
> Driver)

I guess it's a specific chipset for certain hardware modems.

> and
> [chan_phone.so] => (Linux Telephony API Support)
>   == Parsing '/etc/asterisk/phone.conf':   == Parsing
> '/etc/asterisk/phone.conf'

I guess we'll have to have a look into the Linux Telephony API,
perhaps it is only half-duplex.

> Can those two be used for a voice modem?

Probably if you have a Conexant V.90 Chipset.
chan_phone I don't know.

> There is a modem_bestdata.conf file somewhere?

Don't know.

> 
> Thanks,
> Dan
> 
> 
> ----- Original Message ----- 
> From: "Anthony Wood" <woody+asterisk at switchonline.com.au>
> To: <asterisk-users at lists.digium.com>
> Sent: Wednesday, June 04, 2003 2:09 AM
> Subject: Re: [Asterisk-Users] Voice Modem + Soundcard Driver
> 
> 
> > 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

-- 
Woody