Panasonic KX-T336 System Reference Manual page 656

Operation
Turning BGM on when BGM is off
1. Lift the handset.
2. Dial the feature number for "BGM
Through External Paging."
• After you hear confirmation
tone 2, BGM sounds from the
external pager(s).
3. Replace the handset.
Turning BGM off when BGM is on
1. Lift the handset.
2. Dial the feature number for "BGM
Through External Paging."
• After you hear confirmation
3. Replace the handset.
5-F-9
tone 2, BGM from the external
pager(s) stops.