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ITU-T Q.291 Security arrangements; General; Basic security arrangements; Types of failure, recognition of failure and abnormal error rates
ITU-T Q.253 Functional description of the signalling system; Association between signalling and speech networks
ITU-T Q.430 Conversion between analogue and digital versions of System R2 line signalling
ITU-T G Supplement 35 III.5 Guidelines concerning the mesasurement of wander
ITU-T E.276 Transmission in encoded form of telephone reversed charge billing and accounting information