> The application will generate DTMF codes, and send a voice message. The
> modem needs basic hayes commands, enough to go off hook and dial out,
> send a message and hang up or hold the line open. ARM9 processor
> running a uLinux distro.
This is possible with the ZyXEL U1496E(+) series of modems. However,
you will need quite a bit of time to get it to work, and even then it
wont be very reliable. I would recommend you to not use a modem at all,
but rather a line-interface module (MITEL does some, IIRC MH44288 or so
is a product code to look for). These convert the phone line into
audio-in and audio-out, plus control lines to pickup/hangup. This line
interface, an ADC/DAC and off you go. No Hayes, no char-pacing, no
CELP, no stuck sessions, no nothing.
Reply by CBFalconer●November 29, 20042004-11-29
Joe wrote:
>
> I need to find a basic rs232 voice modem for a proof of concept
> device. The final product will have the functionality built in but
> for now I need an external solution.
>
> The application will generate DTMF codes, and send a voice message.
> The modem needs basic hayes commands, enough to go off hook and
> dial out, send a message and hang up or hold the line open. ARM9
> processor running a uLinux distro.
You don't need a modem, just normal POTS service and at most a
relay to connect/disconnect. Then it is your choice between DTMF
and pulse dialling.
--
"The most amazing achievement of the computer software industry
is its continuing cancellation of the steady and staggering
gains made by the computer hardware industry..." - Petroski
Reply by Joe●November 28, 20042004-11-28
I need to find a basic rs232 voice modem for a proof of concept device.
The final product will have the functionality built in but for now I
need an external solution.
The application will generate DTMF codes, and send a voice message. The
modem needs basic hayes commands, enough to go off hook and dial out,
send a message and hang up or hold the line open. ARM9 processor
running a uLinux distro.
Any help would be appreciated.
Joe