Vertical Communications DSU and DSU II - Manual (Page 32)

2.5 Setting The Music On Hold Feature
Music that is provided to outside lines while those lines are on hold can
be enabled and disabled through the attendant’s station:
•
To set the music on hold feature,
1. Press INTERCOM.
2. Dial ✳ # 0 4.
3. Press L1 (top, left-hand programmable button) to alternate the
feature on and off.
—OR—
— dial 1 to enable,
— dial 2 to disable,
NOTE: Associated light will turn on when music on hold is provided
and turn off when the feature is disabled,
4. Press SPEAKER to end.
Programming The Attendant Features GCA70–245
2–12 LCD Speakerphone Reference Manual