Status tones
Encyclopedia
Status Tones are short tones that are generated and placed on the Telephone Line
Telephone line
A telephone line or telephone circuit is a single-user circuit on a telephone communication system...

  while a call is being initiated, while it is being conducted, and while it is being monitored by a third party to inform all on the line of an actve or defined event.

Examples

A user with call waiting
Call waiting
Call waiting , in telephony, is a feature on some telephone networks. If a calling party places a call to a called party which is otherwise engaged, and the called party has the call waiting feature enabled, the called party is able to suspend the current telephone call and switch to the new...

 service will hear double beeps on the line when another party is calling to their phone, but the recipient is actively engaged on the line. The call waiting tone is known as a "Feature" in some Telephone communities, and is billed by the Telephone Company as an Enhanced Service.

Other examples include:
  • Ringback tone
    Ringback tone
    A ringback tone is an audible indication that is heard on the telephone line by the caller while the phone they are calling is being rung. It is normally a repeated tone, designed to assure the calling party that the called party's line is ringing, although the ring-back tone may be out of sync...

    or Ringing
  • Telephone Being Monitored
  • Beep on hold
  • Intercept Long Distance Charge Cancel
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