�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