telecommunication Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...

, an automatic redial is a

service feature A vertical service code (VSC) is a sequence of digits and the signals star (*) and number sign (#) dialed on a telephone keypad or rotary dial to enable or disable certain telephone service features. Some vertical service codes require dialing of ...

that allows the user to dial, by depressing a single key or a few keys, the most recent

telephone number A telephone number is a sequence of digits assigned to a landline telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices f ...

dialed at that instrument. ''Note:'' Automatic redial is often associated with the

telephone A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...

instrument, but may be provided by a PBX, or by the central office. ''Synonym'' ''last number redial.'' ''Contrast with'' automatic calling unit. Often one must subscribe to a caller ID for use of this function on a landline.

References

{{telephony-stub Calling features Telecommunications