The DigiPhone is my first hardware product.  It is the result of my
senior project at Cal Poly.  I am building a batch of them this
summer and will be marketing them in August (1989).  Included below
is the abstract from the senior project report.  Please let me know
if you would be interested in something like this.  Currently, I
have it installed on my BBS number and interfaced with Perspective
BBS.  Just call my BBS voice and press "0" (touch-tone) within the
first 5 seconds to get a demonstration of the DigiPhone.

                                     ABSTRACT  

                                  The DigiPhone

                            An IBM PC Voice Mail Card

                 The  DigiPhone  functions as  an  enhanced  telephone 
            answering  machine and is designed as a plug in  card  for 
            the  IBM  PC  and compatibles.  In  addition  to  standard 
            answering   machine  functions,  the  DigiPhone   features 
            programmable outgoing message selection, message  routing, 
            response  to  caller's  touch  tone  signals,  and  remote 
            programming ability. 

                 The  DigiPhone will answer incoming telephone  calls, 
            deliver   outgoing   messages   which   are   programmably 
            selectable  from  as many as 16 digitized  audio  messages 
            stored on the PC's hard disk, record incoming messages  to 
            the hard disk or optionally to an external  tape recorder, 
            route  messages  to  a specified receiver,  respond  to  a 
            caller's   touch   tone  signals,  and  enter   a   remote 
            programming mode as a result of a special code sent by the 
            caller. 

                 Audio  messages are processed digitally via  A/D  and 
            D/A  converters which receive and send 8 bit data  to  and 
            from  the IBM PC through a selectable port  address.   A/D 
            conversion  is  implemented  with  the  ADC0802  which  is 
            operated  at a clock rate of 512 Khz (corresponding  to  a 
            conversion rate of 8 Khz).  D/A conversion is  implemented 
            with  the DAC0830.  Interface with the telephone  line  is 
            accomplished  with  the  speech  circuit  TP5700   coupled 
            through  opto-couplers.   Messages are recorded  using  an 
            external  600  ohm  dynamic  microphone  and  played  back 
            through an external 8 ohm speaker.

                 A  full featured pull-down menu program  is  provided 
            with   the  DigiPhone  and  implements  all   programmable 
            functions.  Data I/O with the card is interrupt driven  to 
            allow apparent simultaneous disk I/O.

                 Production of the DigiPhone is planned for July, 1989 
            with distribution planned for August, 1989.  Retail  price 
            will be less than $200.
                                            
        Daniel Durbin___________________________________________________
        SysOp: Cygnus X-1 BBS                | CIS: 73447,1744
        (619) 457-2665 (data)                | GEnie: D.DURBIN