A zero added chip solution!:
A Scenix can be used for 1200baud FSK, and DTMF.
  http://www.scenix.com/virtual/modem/modem.html
Ring detect is pretty easy too with an optocoupler.
Then, maybe it is possible to put all your code into the Scenix, and remove the PIC! :)

"It takes just a little programming"

Regards
/Morgan


>Duilio Foschi escribis:
>
> > in the current project I would need a modem-on-a-chip that has the following
> > features:
> >
> > 1. DTMF detection
> > 2. DTMF generation
> > 3. ring detect
> > 4. CallerID
> >
> > trasmission speed is not that important.
> >
> > 1200 baud is ok.
> >
> > Somebody heard of such a beast ?
> >
> > Thank you
> >
> > Duilio Foschi

Morgans Reglerteknik, HŠllekŒs, 277 35 KIVIK
  tel 0414-446620, fax 70331, mrt@iname.com