Louis:
I would not worry about DTMF decoder because it is very simple to implement.
I use motorola part to decode the analog signal. on output  I get 4 bit data
and data available pin. I simply interface it to pic and all done.  I use
MC145436ap
If you want to use an other chip for decoding and dialing I would recommend to
use
MITEL products. This company make only telephone communication IC's.

Hope this helps.

Andre Abelian


>
>
> Actually I have no solution to the problems above. I would apreciate any
> good ideas from experienced
> PIC developers. I haven't design anything since the 68705 and 8748
> microcontrolers were very popular!
>
> Louis Grau.
> France



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