MT3334HD8 User Guide
16 CommPlete Communications Server
Dialing Commands
Dialing commands are used to dial and to hang up.

Ds Dial

s
= phone number
Default: none
The letter
D
in a command causes the modem to dial the telephone number immediately following it. For
example, if you type ATD5551212<CR>, the modem dials the number 555-1212.
The MT3334HD8 supports several dialing methods. With the D command, you can specify either pulse
(ATDP) or tone (ATDT) dialing. You can also modify the dialing command with several characters that
are explained in “Dial Modifier Commands” in this chapter.
The MT3334HD8 lets you select either smart (wait-for-dial-tone) dial ing or blind dialing. With smart
dialing, the modem waits for and detects dial tones and busy signals. With blind dialing, the modem works
with timed pauses (determined by the value of register S6), not dial tone and busy signal detection. See the
X command for more information on blind and smart dialing.

A: Continuous Redial

If you select smart dialing through the X3 or X4 command, the A: command lets you continuously redial a
busy number until your call is answered. (North American units have a maxim um of 10 redials; this
command is not available on UK or International models.)
Use this command only if you have reached a busy number after executing a nor mal dial command. Type
A: (you need not type
AT
, nor do you need to press ENTER), and the modem redials the number. If you
again reach a busy signal, the modem continues to redial until it gets thro ugh. You can stop the modem
from redialing by pressing any key.
To save a step when redialing a phone number, enter a colon (:) at the end of the phone number. The result
is the same as if you had entered A:

Hn On-Hook/Off-Hook

n
= 0 or 1
Default: none
You can make the modem go on-hook (hang up) or go off-hook with the H command.
H0 (or H) hangs up the modem
H1 brings the line off-hook, just as if you had picked up the telephone handset.
It is not necessary to use the H1 command to bring the line off-hook when using the D command. The
modem automatically goes off-hook when you press ENTER at the end of the dial command.
Dial Modifier Commands
The dial string can include the digits
0
through
9
, the pound sign (
#
), the asterisk (
*
), and the letters
A
,
B
,
C
, or
D
. The latter are used by some PBXs; the exact function will depend on the PBX manufacturer’s
feature set and implementation. There are also several command characters, called “dial modifiers,” that
can be included within a dialing command after the letter
D
. Their functions include pulse or tone dialing,