AT&T MERLIN Plus Training Manual page 63

To use the do not disturb button:
Action
Touch the Do Not Disturb button.
To cancel do not disturb:
Touch the Do Not Disturb button.
Result
The green light next to Do Not
Disturb comes on.
An internal caller will hear a
busy signal if they try to call your
intercom number.
A transferred call will return to
the previous intercom number.
An outside call will not ring at
the Do Not Disturb phone (Any
other phone that has this line,
however, will still ring.)
The green light next to Do Not
Disturb goes off.
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