Editing Busy signal (section)

==Reasons for a busy signal==
An otherwise unspecified busy signal indicates that the called number is occupied:
* The called number is talking with another caller on the phone
* The number is calling out
* Someone else has called the number or is calling the number at the same time
* The other line was left off-hook
* It is otherwise unavailable

The standard busy signal sometimes occurs (sometimes with an [[intercept message]] played over the busy) at the end of a call to [[disconnect supervision|indicate]] the other party has hung up (see [[Disconnect tone]]), but mostly the [[off-hook tone]] is used. In some phone companies in the United Kingdom, the busy signal is played after the [[dial tone]] to indicate the caller has used up their allocated time to dial a number and must hang up, before the off-hook tone is played.