Compaq Armada 1700 Reference Manual page 85

+FTM=n
+FRM=n
+FTH=n
+FRH=n
These commands may be used with the ATD command to dial
telephone numbers.
L
P
S=n
T
W
; (semicolon)
@ (at character) Wait for Quiet Answer Command.
! (exclamation)
, (comma)
$ (bong detect)
^ (carat)
> (greater than)
0 through 9
A, B, C, D, #, *
The S register default values are set to function appropriately
under most circumstances. However, their values may be modified
if necessary. For example, it may take an especially long time to
get a dial tone in your office, so you may choose to reset S6 for a
longer wait time.
Continued
Transmit Data.
Receive Data.
Transmit Data with HDLC Framing.
Receive Data with HDLC Framing.
Redial Last Number.
Pulse Dialing.
Dial Stored Number.
Tone Dialing.
Wait for Dial Tone.
Return to Command Mode.
Flash Hook Command.
Pause During Dialing.
Wait for calling card tone.
Disable Data Calling Tone Transmission.
Ground Start Dialing.
Dial Digits. Valid digits for pulse or tone dialing.
Dial Characters.