CONTENTS

 0     Introduction
 1     Scope and field of application
 2     References
 3     Definitions
 4     Abbreviations
 5     General aspects
        5.1     CSPDN
        5.2     ISDN (CS)
        5.3     Call control between the CSPDN and ISDN
 6     Specification of interworking functions
        6.1     Interworking functions for identical data transmission services
                  6.1.1      Physical link characteristics and interworking functions assigned to layer 1
                  6.1.2      Support of the OSI-NLS
                  6.1.3      Signalling conversion (protocol mapping)
                  6.1.4      Protocol mapping for supplementary services
                  6.1.5      Mapping of service signals and causes
        6.2     Interworking functions for non-identical data transmission services
                  6.2.1      Physical link characteristics and interworking functions assigned to layer 1
                  6.2.2      Support of the OSI-NLS
                  6.2.3      Signalling conversion (protocol mapping)
                  6.2.4      Protocol mapping for supplementary services
                  6.2.5      Mapping of service signals and causes
 7     Operation and maintenance