Call-waiting definitions

A telephone service that alerts someone using the phone to an incoming call and allows switching between calls.
noun
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A telephone service that allows a person already talking on the telephone to be alerted to an incoming call by a faint beep or click and to take that call by putting the first call on hold.
noun
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A CLASS service of the public switched telephone network (PSTN). Call waiting allows an incoming call to wait in queue if the target telephone line is engaged. A call waiting signal alerts the user of the target telephone line to the fact that a call is waiting. See also CLASS and PSTN.
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A voice telephone system (e.g., PBX or Centrex) feature that allows an incoming call to wait in queue if the target station is engaged. A call waiting signal alerts the user to the fact that a call is waiting. See also camp-on.
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