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 ...