Panasonic KX-T336 System Reference Manual page 544

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