I did a quick google search on "dtmf decoder pic microcontroller" and found these...
http://www.instructables.com/id/DTMF...ip-PIC-Microp/
http://dtmf.voipintouch.net/content/dtmf.htm
http://www.romanblack.com/DTMF/DTMF_alg.htm
http://www.microchip.com/stellent/id...cName=en536955
http://www.microchip.com/stellent/id...pnote=en024294
I did not read them, but hopefully they will help
The first couple of links look real promising





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