Panasonic KX-TDA15

1.7.8 Turning on the Background Music (BGM)
You can listen to the background music through your telephone speaker while on-hook.
An external music source, such as a radio, must be connected.
If
your extension becomes busy (off-hook, making or receiving a call etc.), the music stops
temporarily. When you go back on-hook, the music starts again.
To select and set/cancel
Off-hook. On-hook.
PT
Enter 751.
5 17
C.Tone
Enter 1 to set
or 0 to cancel.
Set
Cancel
1
0
OR
124 User Manual
1.7.8 Turning on the Background Music (BGM)