10-27-94                 Dialtone / BUSY  Problems

     Some  places (more often in Europe or Australia than in the US) or  on
some in-house phone systems, the modem may not recognise Dialtone or  BUSY,
in  rare  cases  both. In this  case use X1, X2 or X3 in  the  dial  prefix
(ATX1DT) or the init string. X1 will see neither Dialtone nor BUSY, X2 will
see  Dialtone  only,  and 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).

Also,  sometimes  the dialtone on one of those lines may  be  marginal.  If
there  is  a slight change in the line you may suddenly  start  getting  NO
DIALTONE.  I would avoid thinking the modem has gone bad. Use X1/X3 etc  as
long as the modem is still working OK otherwise. A change in the line later
may 'fix' it so you don't need the X1 any more.

     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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