Continuous redial

Continuous redial, busy number redial, or repeat dial[1] is a vertical service code (calling feature) that allows callers to automatically redial a busy telephone number until a connection is made.

It was introduced in 1992 as Repeat Dialing,[1] and is activated by dialing a combination of special characters and numbers after hanging up following a call to a busy line.

The North American Numbering Plan assigned *66 to activate continuous redial and *86 to deactivate it.

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This article incorporates public domain material from Federal Standard 1037C.