AT&T MERLIN LEGEND Release 2.0 Data User's Manual page 66

Making and Answering Data Calls
2. Second Stage Dialing:
To call an inside analog data station:
3-34 Making Data Calls Through a Modem Pool
a. Enter the appropriate modem command
for dialing:
b. Enter #31 for privacy.
c. Dial the analog data station extension.
For example, when using a Hayes-type modem to
make an inside call to another analog data station
at extension 22 with privacy activated, you would
enter:
To call an outside analog data station:
a. Enter the appropriate modem command
for dialing:
a t d t
a t d t