3-3
Dn - Dial
This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If no dial string is
supplied, the modem will go on-line and attempt the handshake in originate mode. If +FCLASS=0 is selected, the modem will behave as a
data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7
to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go on-
hook with the NO CARRIER response. This command will be aborted in progress upon receipt of any DTE character before completion of the
handshake.If +FCLASS=1 or 2 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine (or
modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be aborted upon receipt of
any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook and return to command mode after
displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as if the +FRH=3 command has been issued. (Refer to
the +FRH command to determine how the modem behaves following this stage).
Dial Modifiers. The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses,
hyphen, and spaces being ignored.
0-9
DTMF digits 0 to 9.
•
The
‘
star
’
digit (tone dialing only).
#
The
‘
gate
’
digit (tone dialing only).
A-D
DTMF digits A, B, C, and D.
L
Re-dial last number: the modem will re-dial the last valid telephone number. The L must be immediately after the
D with all the following characters ignored.
P
Select pulse dialing: pulse dial the numbers that follow until a
“
T
”
is encountered. Affects current and subsequent
dialing.
T
Select tone dialing: tone dial the numbers that follow until a
“
P
”
is encountered. Affects current and subsequent
dialing
S=n
Dial the number stored in the directory (n = 0 to 3). (See &Z.)
!
Flash: the modem will go on-hook for a time defined by the value of S29.
W
Wait for dial tone: the modem will wait for dial tone before dialing the digits following
“
W
”
. If dial tone is not
detected within the time specified by S7, the modem will abort the rest of the sequence, return on-hook, and
generate an error message.
@
Wait for silence: the modem will wait for at least 5 seconds of silence in the call progress frequency band before
continuing with the next dial string parameter. If the modem does not detect these 5 seconds of silence before the
expiration of the call abort timer (S7), the modem will terminate the call attempt with a NO ANSWER message. If
busy detection is enabled, the modem may terminate the call with the BUSY result code. If answer tone arrives
during execution of this parameter, the modem handshakes.
&
Wait for credit card dialing tone before continuing with the dial string. If bong is not detected within the time
specified by S7, the modem will abort the rest of the sequence, return on-hook, and generate an error message.
,
Dial pause: the modem will pause for a time specified by S8 before dialing the digits following
“
,
”
.
;
Return to command state. Added to the end of a dial string, this causes the modem to return to the command
state after it processes the portion of the dial string preceding the
“
;
”
. This allows the user to issue additional AT
commands while remaining off-hook. The additional AT commands may be placed in the original command line
following the
“
;
”
and/or may be entered on subsequent command lines. The modem will enter call progress only
after an additional dial command is issued without the
“
;
”
terminator. Use
“
H
”
to abort the dial in progress, and go
back on-hook.
^
Toggles calling tone enable/disable: applicable to current dial attempt only.
( )
Ignored: may be used to format the dial string.
•
Ignored: may be used to format the dial string.
<space>
Ignored: may be used to format the dial string.
<i>
Invalid character: will be ignored.
