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UIC 648 (E) 4th Edition, September...
UIC 641 (E) 4th Edition, February...
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
ITU-T Q.476 Abnormal release of outgoing and incoming R2 registers
ITU-T Q.292 Security arrangements; Reserve facilities provided
ITU-T Q.440 Interregister signalling; General
ITU-T G Supplement 36 III.5 Jitter and wander accumulation in digital networks