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ITU-T E.164/I.331- /Q.11bis Supplement 5 ...
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ITU-T P.862.3 Application guide for objective quality measurement based on Recommendations P.862, P.862.1 and P.862.2
ITU-T P.564 Conformance testing for narrowband voice over IP transmission quality assessment models
ITU-T G.113 Transmission impairments due to speech processing
ITU-T Y.1531 SIP-based call processing performance
ITU-T X.1123 Differentiated security service for secure mobile end-to-end data communication
ITU-T X.1124 Authentication architecture for mobile end-to-end data communication
ITU-T P.64 Determination of sensitivity/frequency characteristics of local telephone systems
ITU-T P.79 Calculation of loudness ratings for telephone sets
ITU-T X.1143 Security architecture for message security in mobile web services
ITU-T Y.1530 Call processing performance for voice service in hybrid IP networks
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