Rec. ITU-T F.600 (03/1993) � SERVICE AND OPERATIONAL PRINCIPLES FOR PUBLIC DATA TRANSMISSION SERVICES
FOREWORD
1 Introduction
    1.1 Scope
    1.2 Purpose
2 Terms
3 Access to the service
    3.1 Categories of access
4 International data circuits/routes
5 Duration of service
    5.1 Availability
    5.2 Outages
    5.3 Time
6 Types of calls
    6.1 Data calls on switched data transmission services
    6.2 Service calls
7 Modes of operation
    7.1 General provisions between Administrations
    7.2 Automatic operation
    7.3 Semi-automatic and manual operation
8 Directories � Compilation and supply
    8.1 Electronic directories
    8.2 .Manual. directories
9 Call progress signals on public data networks
10 Quality of Service
    10.1 General principles
    10.2 Specific service aspects
    10.3 Management of Quality of Service
11 General aspects of provision of service
    11.1 General terms and conditions
    11.2 Information relating to service problems
12 Provisions of customer support