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ITU-T Q.252 Functional description of...
ITU-T Q.296 Monitoring and...
ITU-T Q.452 Multifrequency signalling equipment; Requirements relating to transmission conditions
ITU-T Q.265 Speed of switching and signal transfer in international exchanges
ITU-T Q.460 Normal call set-up procedures for international working
ITU-T Q.135 Principles of rapid transmission testing equipment