On Sun, 1 Feb 1998 23:22:38 +0100 Flavio Rizzardi
<riz@GHOST.BIO.UNIPD.IT> writes:
>Hello all.
>
>My boss told me to build a circuit to be connected to the telephone
>line;
>I'm doing some preliminary research and I'd like some tips or
>suggestions.
>The circuit should be able to dial a phone number (DTMF or pulses),
>wait
>for an answer from a human operator (i.e. distinguish a voice from a
>busy
>line or other tones) and then recognize DTMF tones and reply with
>short
>pre-recorded messages (something like: "Press 1 on your telephone to
>do
>this, or 2 to do that").
>



        How about just putting a socket in for an ISA card and use a
CHEAP internal data/fax/voice modem card?  These include an FCC
registered DAA and all the hardware you need.  It seems like it'll take a
fair amount of ROM to hold the digitized speech, but you can hang some
external ROM on the PIC and just have the PIC read a byte, then send it
to the modem card.

Harold

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