I am making a project in that I use 8880 (or 8888) of California Microdevices,
detector and
generator of dtmf.
http://www.calmicro.com/

Motorola has the MC14LC5447P, identifier of call and ring detect in nondigital
lines

Saludos
                    Jose Antonio Gracia

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