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ITU-T Abbreviations (00/88) List of abbreviations and acronyms
ITU-T Q.455 Multifrequency signalling equipment; the receiving part of the multifrequency equipment
ITU-T Q.131 Abnormal release conditions of the outgoing register causing release of the international circuit
ITU-T Q.317 Further specification clauses relative to line signalling
ITU-T Q.463 Signalling between the outgoing international R2 register and an incoming R2 register in a national exchange in the destination country
ITU-T Q.274 Transmission methods; Modem and interface requirements
ITU-T Q.471 Termination of interregister signalling; At the last incoming R2 register situated in the exchange to which the called subscriber is connected