Telebit T3000 Reference Manual page 152

Placing a Call (continued)
If you did not hear a dial tone before the modem started
dialing, connect a telephone to the telephone line and
listen for a dial tone. If you do not hear the dial tone, the
telephone line is dead. Contact your telephone company
service representative for assistance.
Did the telephone ring at the remote site? You should hear a
ringing signal over the speaker.
Depending on how quickly the remote site answers the
call, you may not hear a ringing signal. If you hear the
answering modem's answer tones, you can assume that the
remote site answered the call.
Make certain that you entered the correct dialing
sequence. If you are going through a Private Branch
Exchange (PBX), you may need to enter 9W to access an
outside line and wait for a second dial tone. The S7 register
determines how long the modem waits for a dial tone when
a W is entered in a dialing sequence.
If your call is routed through key systems, security
devices, or similar equipment, additional access digits
might be required, and it may take longer to set up the call.
You can use one or more commas in the dialing sequence
to cause the modem to pause when necessary. The length
of the pause is determined by the S8 register.
You may need to extend the time that the modem waits for
a carrier by increasing the value of the S7 register.
It is possible that the touch tone speed is too fast for the
telephone switching equipment, which occasionally
happens with older telephone equipment. Try lengthening
the touch tone timing specified by the S 11 register.
Troubleshooting 7-9