8-18-93
                           Digital Phone Systems

  If a normal 'house' phone can dial on your Digital Phone system, then the
modem  will also dial through it. However the modem may not recognise  dial
tone.  In this  case use X1 or X3 in the dial prefix (ATX1DT) or  the  init
string. X1 will see neither dial tone nor BUSY. X3 will see the BUSY  only.
If the software/fax doesn't have a place for init, change call-progress  to
NONE.

     There  is  also  X2  if you have trouble  with  false  BUSY,  but  can
recognise dialtone (can happen w/voice answer fax machines).

     Sometimes putting a '@' at the end of the dial string helps (after the
phone  number, as that waits for 5 seconds of silence after the  other  end
picks up the phone. (will wait for silence after a voice answer).

     The  modem uses only 2 wires on the phone line, the center 2 wires.  A
phone  which uses other wires can still get it's signals through the  other
wires, even though the modem cannot see them.

     If  you  have trouble dialing PULSE there is a command to  change  the
pulse  make/break  ratio needed in some areas (usually overseas).  &P  (see
your manual).
                                   Don Hinds - Zoom Tech
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