AT&T Merlin II Feature Module 2 User Manual page 9

Privacy
[TT]
The Privacy feature prevents people who share your
lines from joining your conversation. Be sure to
deactivate the feature when you don't need it any
longer.
Account Code
Privacy
To make a private call:
1 Lift the handset
You hear a dial tone.
2 Dial #31 to turn Privacy on.
3 Hang up your handset when you've finished.
4 Lift the handset
You hear a dial tone.
5 Dial #30 to turn Privacy off.
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