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A busy signal (or busy tone or engaged tone) in telephony is an audible or visual signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. The busy signal has become less common in the past decade due to the prevalence of call waiting and voice mail. ==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 indicate the other party has hung up, but mostly the Off-hook tone is used. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Busy signal」の詳細全文を読む スポンサード リンク
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