CONTENTS

�1���� Introduction
�2���� Scope and field of application
�3���� References
�4���� Abbreviations
�5���� General model of international PDTS
�6���� Addressing aspects
�7���� Performance aspects
�8� ���Call progress signals
�9���� Multicast operation
10���� User classes of service, categories of access
11���� Optional user facilities
12���� Closed user groups
13���� Permanent virtual circuit
14���� Duration of service
15���� Outages
16���� Service calls
17���� General provisions between Administrations
18���� General provisions between Administration and customer