A

AAL: ATM Adaptation Layer.

AAN: All Area Networking.

AAR: Automatic Alternative Routeing.

abandoned call: A call which is terminated after a connection has been made but before the receiver goes off-hook, i.e. conversation occurs.

abbreviated address call: A call which requires a subset of the full address to initiate the call, the complete address being available from the network switch, such as a packet assembler/disassembler.

abbreviated answer: The reply to a call, made after communications has been established, in which the call sign of the calling station is not included.

abbreviated dialling: Feature of switches, such as a PABX, which allows users to use shortened numbers to place a call, the switch making the translation to the full ...

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