Automatic ring back

Automatic ring back is a service offered by phone companies.

On making a telephone call to a number that is engaged, automatic ring back is a service provided by the telephone company whereby, when the called number becomes available, the caller is rung back, usually with a distinctive "ring back" ring. When the phone is picked up, it calls the previously engaged number. The service is typically invoked by keying a number on hearing the engaged tone.

In the UK the service is also known as Ringback.^[1]

In the United States the service is often called Auto Redial.

In the United States Army on post wide communications networks, this is referred to as Callback or Automatic Callback.

• Callback
• Camp-on busy signal
• Vertical service code

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Automatic ring back" – news · newspapers · books · scholar · JSTOR (February 2008) (Learn how and when to remove this message)

This article related to telephony is a stub. You can help Wikipedia by expanding it.

• v
• t
• e