Busy signal

（重定向自Engaged tone）

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.

单词	Engaged tone
释义	Engaged tone 英语百科 Busy signal （重定向自Engaged tone） 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.
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