Glossary: B

A   B   C   D   E   F   G   H    I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z Background Music (BGM) You can listen to background music through the built-in speaker of the telephone. An external music source, such as a radio, must be connected. The music stops when a call come in or when you go off-hook.