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