[Asterisk-biz] background music

[Satchid]

To everybody on this wonderful group.
I am considering to use an asterisk PBX in my company with 70 telephones and
I would like to play background music trough the speakers of the telephones.
When the hook is lifted or when the phone rings, the background music stops
till the phone is on hook again (or 'til the phone stops ringing). Is this
possible? Or can it easily be programmed. Is it not similar with the ring
tone?


Thank you all,

Willy