Zip tone
Type of call-progress tone / From Wikipedia, the free encyclopedia
In telephony, a zip tone (also known as a whisper tone or call waiting tone) is a call-progress tone which indicates a new incoming call is either connecting or waiting depending on the application. Unlike a ringtone, which alerts those near a telephone to answer it, a zip tone alerts someone already on the line—for example a telephone operator, call center agent, or telephone subscriber with call waiting service—that action is needed for an incoming call such as pressing a button or reciting a phrase (e.g. "May I help you?"). This way of offering an incoming call to an available call center agent is also referred to as 'call forcing' or 'forced calling'. [1][2]
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