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APPENDIX A: Troubleshooting
internal dial tone that sounds different from the normal dial tone.
In that case, the modem may not recognize the dial tone and may
treat it as an error. Check your PBX manual to see if you can
change the internal dial tone; if you can’t, change your modem’s
initialization string to replace X4 with X3, which will cause the
modem to ignore dial tones.
• If the modem reports BUSY, the other number may be busy, in
which case you should try again later, or it may indicate that you
have failed to add a 9, prefix to the phone number if you must dial
9 for an outside line.
If you must dial 9 to get an outside line, the easiest way to dial it au-
tomatically is to include it in the modem’s dial prefix, e.g., ATDT9,.
Note the comma, which inserts a pause before the number is
dialed. By inserting 9, into the dial prefix, you do not have to in-
clude it in each directory entry in the terminal.
To change the dial prefix in Windows Terminal, select Settings,
Modem Commands. To change it in Windows 95 HyperTerminal,
select Call, Connect from the menu bar, click Dialing Properties,
and type 9 in the local and long distance boxes in How I Dial from
This Location.
• If the modem reports NO ANSWER, the other system has failed to
go off-hook, or you might have dialed a wrong number. Check the
number.
• If the modem reports NO CARRIER, the phone was answered at the
other end, but no connection was made. You might have dialed a
wrong number, and a person answered instead of a computer, or
you might have dialed the correct number but the other computer
or software was turned off or faulty. Check the number and try
again, or try calling another system to make sure your modem is
working. Also, try calling the number on your telephone. If you
hear harsh sounds, then another modem is answering the call, and
the modems may be having problems negotiating because of
modem incompatibilities or line noise. Try connecting at a lower
speed.