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Chapter 3 Solving Common Problems 21
Dial Troubleshooting
Problem: The modem does not automatically dial a
call when you send a Dial command.
Solution: Make sure the modem speaker is turned on in
your software so that you can hear dialing
sounds. Also make sure that the telephone line
is plugged in.
Make sure that your are dialing a valid tele-
phone number, including any required dial
prefixes.
If you are using tone dialing on a line that re-
quires pulse dialing, the line may not be able to
accept tone-dialed calls. Select Pulse dialing in
your software or include the P command in
place of T in your Dial command line to specify
pulse dialing.
Make sure software dialing prefix is either
ATDT (for tone dialing) or ATDP (for pulse di-
aling).
Make sure your communications software and
modem are configured for the same serial port.
Make sure your modem has hung up from the
previous call. Select Hang Up in your software.
Or you can change to terminal mode, wait one
second, type ATH, and press Enter to hang up
the modem.
Connection Troubleshooting
Problem: The modem can connect to some modems,
but not to others.
Solution: If a remote modem does not respond because of
the extended negotiation process, you may have
to disable part or all of the negotiation process.
In the following table, “protocol” means error
correction and data compression.