Requests that the channel indicate the busy condition and then waits for the user to hang up or for the optional timeout (in seconds) to expire.

This application signals a busy condition only to the bridged channel. Each particular channel type has its own way of communicating the busy condition to the caller. You can use Playtones(busy) to play a busy tone to the caller.

exten => 123,1,Playback(im-sorry)
exten => 123,2,Playtones(busy)
exten => 123,3,Busy()

See Also

Congestion(), Progress(), Playtones(), Hangup()