Common
Ringback tone
The tone heard by a calling party to indicate that the called phone is ringing.
Ringback tone
In telephony, a ringback tone (also ringback, ringing tone, or audible ringing) is a call progress tone heard by the calling party during a telephone call which indicates the called telephone is ringing. It typically consists of a repeating tone with a cadence resembling the ringing signal. In some systems, a ringback tone may be replaced with customized audio, such as music, sound effects, announcements, or advertising.
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