ITU-T Rec. E.164 (1991) – NUMBERING PLAN FOR THE ISDN ERA
FOREWORD
1 Introduction
2 Definitions
3 National numbering plan
4 Limitation of the number of digits to be dialled by subscribers
4.1 International number
4.2 National (significant) number - pre-time T definition
4.3 Digit capacity of international registers - pre-time T
4.4 Structure of the international ISDN number
4.5 Number length - post-time T
5 Prefixes and codes
5.1 Applications
5.2 Country code 8), 9)
5.3 Assignment of country codes
5.4 Codes for new international services
5.5 Trunk prefix 8)
6 ISDN numbering plan principles
6.1 General
7 Numbering allocation principles
8 Network identification
9 Service identification
10 Calling/connected line identity
11 Dialling procedures
12 Addressing within a subscriber's installation
12.1 Addressing by an ISDN number
12.2 Sub-addressing (network address extension)
12.3 Combination of addressing and sub-addressing
12.4 Address delimiters
13 Recommendation history
ANNEX A – List of country codes incorporating amendments proposed by the World Plan Committee, 1988
ANNEX B – Rules for the assignment of spare country codes
ANNEX C – List of spare country codes for the international semiautomatic and automatic service
ANNEX D – Guidelines for NDC application
ANNEX E – Alphabetical list of abbreviations used in this Recommendation