Difference between voice modem and telephony modem

From: Salmo Bytes (devnull_at_montana-riverboats.com)
Date: 11/25/03 

Date: 25 Nov 2003 06:12:48 -0800

I'm trying to put a system together for a quadripledgic friend, where my
friend can use the same headset and microphone to do two things:
a) run voice recognition software on the cpu (to run programs, surf the web,etc)
b) make phone calls.

After looking around in the disabled news groups, it seems as if many
wheelchair people (who can't move their hands) have chosen "voice activated
modems" for making phone calls. But these voice activated modems cannot
easily be controlled by a separate, external voice recognition system
(like ViaVoice, from IBM). So they have to change headsets to make a phone
call (one microphone plugged into the voice modem, another microphone
plugged into the sound card). But people who can't move their hands can't
change headsets. So they need help for each task.

Are these voice modems the source of the problem? Do voice modems respond
to an analog voice signal, when what's needed is digital control?

What is a voice modem?
What is a telephony modem?

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