Compaq AlphaServer 1200 User Manual page 212

Table 6-3 Elements of the Dial-Out String
ATXDT AT = Attention
X = Forces the modem to dial "blindly" (not look for a
dial tone). Enter X if the dial-out line modifies its dial
tone when used for services such as voice mail.
D = Dial
T = Tone (for touch-tone)
, = Pause for 2 seconds
9, In the example, "9" gets an outside line. Enter the
number for an outside line if your system requires it.
Dial the paging service.
15085553333
Pause for 12 seconds for paging service to answer
,,,,,,
"Message," usually a call-back number for the paging
5085553332#
service.
; Return to command mode. Must be entered at end of
string.
6-18 User's Guide