there is an appnote on uchip's website on producing DTMF from a pic, but I
use a tel-tone device (m-8880) to do DTMF send and receive and it works
quite well

 -dan

-----Original Message-----
From: Duilio Foschi [mailto:foschid@SHUTTLE.ETRURIA.NET]
Sent: Sunday, October 24, 1999 2:56 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: send DTMF tones


Using an external modem, I need to do the following things:

1. dial a number
2. detect if the call is answered
3. send DTMF tones to the remote phone

I can do 1. with the command ATDT...
I can do 2. detecting when the ringback signal stops

I don't know how to do 3.

Any hint ?

Thank you

Duilio Foschi