AT Command Set

Dn Dial

This command instructs the modem to begin the dialing sequence. The dial string (n, including modifiers and the telephone number) is entered after the ATD command.

A dial string can be up to 40 characters long. Any digit or symbol (0–9, *, #, A, B, C, D) may be dialed as touch-tone digits. Characters such as spaces, hyphens, and parentheses do not count; they are ignored by the modem and may be included in the dial string to enhance readability.

The following may be used as dial string modifiers.

LRedials last number. Should be the first character following ATD, ignored otherwise.

PPulse dialing.

TTouch-tone dialing (default).

,Pause during dialing. Pause for time specified in Register S8 before processing the next character in the dial string.

WWait for dial tone. Modem waits for a second dial tone before processing the dial string.

@Wait for quiet answer. Wait for five seconds of silence after dialing the number. If silence is not detected, the modem sends a NO ANSWER result code back to the user.

!Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.

;Return to command mode. Causes the modem to return to command mode after dialing the number without disconnecting the call.

^Disable data calling tone transmission.

S=n

Dial a telephone number previously stored using the &Zn=x

 

command (see the &Zn=x command for further information).

 

The range of n is 0–3.

 

 

$

Bong tone detection.

Lucent/Agere Command Set (Advanced Users Only)

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