[Asterisk-Users] Modem => Serial ?

[Steven Critchfield]

On Wed, 2003-06-04 at 01:49, Anthony Wood wrote:
> On Wed, Jun 04, 2003 at 09:05:54AM +0300, Dan wrote:
> > Hi,
> > 
> > Serial voice modems use separate jacks for audio in and audio out.
> > The audio stream cannot be passed through the serial line.
> 
> Actually Dan, you are mistaken here, many serial fax/data/voice modems
> come with answering machine programs which tell the modem to
> send the voice data through the serial line.  Also the vgetty
> program in linux does the same.

The problem is using the AT command set, not whether or not serial
communications can carry voice. Remember that T1 is just a really fast
serial line.

The AT command set is a remnant of low power computing. You issue a
command to get started with voice mode. Then you set it in record mode,
and look to see if there is incoming audio. Then you issue a command to
send audio when you have some in your queue.

> > 
> > ----- Original Message ----- 
> > From: "Gary" <gary at ausmail.com>
> > To: <asterisk-users at lists.digium.com>
> > Sent: Wednesday, June 04, 2003 7:17 AM
> > Subject: [Asterisk-Users] Modem => Serial ?
> > 
> > 
> > > Now with the usual discussion which arises with compatible internal
> > > modems for FULL DUPLEX voice etc...
> > > 
> > > It really makes me think (again) about serial communications....
> > > 
> > > Most external modems will now talk at 115k2 so maybe some will explain
> > > when/what/how/etc of why a serial interface could NOT be developed ??
> > > 
> > > Gary
> > > .
> > > 
> > > 
> > > 
> > > _______________________________________________
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> > > Asterisk-Users at lists.digium.com
> > > http://lists.digium.com/mailman/listinfo/asterisk-users
> > > 
> > > 
> > 
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-- 
Steven Critchfield <critch at basesys.com>