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ITU-T I.510 Definitions and general principles for ISDN interworking
ITU-T Q.921bis Abstract test suite for LAPD conformance testing
ITU-T Q.1211 Introduction to intelligent network capability set 1
ITU-T Q.1205 Intelligent network physical plane architecture
ITU-T X.30 Support of X.21, X.21 bis and X.20 bis based data terminal equipments (DTEs) by an Integrated Services Digital Network (ISDN)
ITU-T E.134 Human factors aspects of public terminals, generic operating procedures
ITU-T F.581 Guidelines for programming communication interfaces (PCIs) definition, service recommendation
ITU-T G.180 Characteristics of N + M type direct transmission restoration systems for use on digital and analogue sections, links or equipment
ITU-T G.181 Characteristics of 1 + 1 type restoration systems for use on digital transmission links
ITU-T G.772 Protected monitoring points provided on digital transmission systems
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