A service feature that allows the user to dial, by depressing a single key or a few keys, the most recent telephone number dialed at that instrument.
Note: Automatic redial is often associated with the telephone instrument, but may be provided by a PBX, or by the central office. Synonym last number redial.

See bootstrap.

[In INFOSEC, a] procedure to rekey a distant crypto-equipment electronically without specific actions by the receiving terminal operator. [INFOSEC-99]
Note: Automatic remote rekeying may also apply to non-crypto devices.

The procedure by which distant equipment is reprogrammed or rekeyed electronically without specific actions by the receiving terminal.

See ARQ.

A circuit providing priority telephone service, typically for key personnel; the circuit is activated when the telephone handset is removed from the cradle causing a ringing signal to be sent to the distant unit(s). See verified off-hook.

Electronic or mechanical selection and routing of outgoing calls without human intervention.

Automatic Scheduled Testing (AST) of Switched Access Services (Feature Groups B, C and D), where the customer provides remote office test lines and 105 test lines with associated responders or their functional equivalent, will consist of monthly loss and C-message noise tests and annual balance test.

A worldwide, switched, secure voice network developed to fulfill DOD long-haul, secure voice requirements. [JP1]

A service feature in which the terminals at each of a set of specified addresses are automatically connected, in a predetermined sequence, to a single terminal at a specified address.