1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.353 (02/2001) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS International routing plan Routing of calls when using international network routing addresses ITU-T
2、 Recommendation E.353 (Formerly CCIlT Recommendation) ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERNATIONAL OPERATION Definitions General provisions concerning Administrations General provisions concerning users Operation of in
3、ternational telephone services Numbering plan of the international telephone service International routing plan Tones in national signalling systems Numbering plan of the international telephone service Maritime mobile service and public land mobile service OPERATIONAL PROVISIONS RELATING TO CHARGIN
4、G AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international telephone service Measuring and recording call durations for accounting purposes UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON- TELEPHONY APPLICATIONS General Phototelegraphy -I ISDN PROVISIONS CONCERN
5、ING USERS INTERNATLNAL ROUTING PLAN NETWORK MANAGEMENT International service statistics International network management Checking the quality of the international telephone service Measurement and recording of traffic Forecasting of traffic Determination of the number of circuits in manual operation
6、 Determination of the number of circuits in automatic and semi-automatic operation Grade of service Definitions Traffic engineering for I-networks ISDN traffic engineering Mobile network traffic engineering TRAFFIC ENGINEERING QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND D
7、EPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services Models for telecommunication services Objectives for quality of service and related concepts of telecommunication services Use of quality of service objectives for planning of telecommunication networks
8、Field data collection and evaluation on the performance of equipment, networks and services E.lOO-E. 103 E.104-E.119 E. 120-E. 139 E.140-E.159 E.160-E.169 E.170-E.179 E.180-E.189 E. 190-E. 199 E.200-E.229 E.230-E.249 E.260-E.269 E.300-E.319 E.320-E.329 E.330-E.349 E.350-E.399 - E.400-E.409 E.410-E.4
9、19 E.420-E.489 E.490-ES05 E. 5 10-E. 5 19 E.520-E. 539 E.540-ES99 E.6WE.649 E.650-E.699 E.700-E.749 E.750-E.799 E.506-E.509 E. 800-E. 809 E.8 10-E.844 E.860-E.879 E. 880-E. 899 E.845-E.859 For further details, please refer to the list of ITU-T Recommendations. ITU-T Recommendation E.353 Routing of c
10、alls when using international network routing addresses Summary To be able to meet the increasing demand of efficient utilization of numbering resources and to satisfy operational needs which will arise according to deregulation of the telecommunication market, there is a need to create an Internati
11、onal Network Routing Addressing system. Without such an addressing system operators may need to allocate dedicated routing numbers (series) from the E.164 numbering plan for certain types of calls, e.g. calls to global services, due to national regulation and bilateral agreements. This Recommendatio
12、n proposes formats for the International Network Routing Addresses, the Serving Service Provider Identification and provides guidance on how to route calls when using International Network Routing Addresses. Source ITU-T Recommendation E.353 was prepared by ITU-T Study Group 2 (2001-2004) and approv
13、ed under the WTSA Resolution 1 procedure on 2 February 2001. Keywords Destination Country Code for INRA (DCCI), Destination Service Provider Address (DSPA), International Network Routing Address (INRA), Originating Country Code for INRA (OCCI), Routing Translation Function, Serving Service Provider
14、(SSP), Serving Service Provider Identity (SSPI), ITU-T E.353 (02/2001) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T i
15、s responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study b
16、y the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a coll
17、aborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or imple
18、mentation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process
19、. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly u
20、rged to consult the TSB patent database. o rru 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU. 11 ITU-T E.353 (02/2001) CONTENTS Ke
21、ywords 1 2 3 4 5 5.1 5.2 6 7 7.1 7.2 7.3 8 Scope . References Terms and definitions . Abbreviations . Formats and structure . International network routing address (INRA) Serving service provider identity (SSPI) . Principles for how the international network routing address information works . Appli
22、cations of the international network routing addresses Routing of E . 164 global services when using international network routing address . Routing of E . 164 geographical area numbers when using international network Routing of E . 164 network numbers when using international network routing addre
23、ss . Assignment of international network routing addresses and serving service routing address . provider identities . Page i 1 1 1 2 3 3 3 4 5 6 8 8 8 . ITU-T E.353 (02/2001) 111 ITU-T Recommendation E.353 Routing of calls when using international network routing addresses 1 Scope This Recommendati
24、on identifies the international call routing principles and guidance, which are applicable to routing of calls when using International Network Routing Addresses. This Recommendation will enable early implementations without providing exhaustive or restrictive lists of use. These routing principles
25、are not precluded for national use. Examples of specific applications are provided in this Recommendation. The exact mechanism for obtaining the routing information and its implications on security, charging, accounting, etc. are outside the scope of this Recommendation. In general, the routing of c
26、alls when using International Network Routing Addresses follows the routing principles in ITU-T E. 170 through E. 174. The service interactions that may take place when routing of calls using International Network Routing Addresses are outside of the scope of this Recommendation. 2 References The fo
27、llowing ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Re
28、commendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. - - - - - ITU-T E. 164 (1997), The international public telec
29、ommunication numbering plan. ITU-T E. 170 (1992), Trafsic routing. ITU-T E. 171 (1988), International telephone routing plan. ITU-T E. 172 (1992), ZSDN routing plan. ITU-T E. 173 (1991), Routing plan for interconnection between public land mobile networks and fixed terrninal networks. ITU-T E. 174 (
30、1995), Routing principles and guidance for Universal Personal Telecom- munications (UPT). ITU-T E. 195 (2000), ZTU-T intemational numbering resource administration. - - 3 Terms and definitions This Recommendation defines the following terms: 3.1 point within a service providers network. The use of A
31、A is optional. 3.2 which the final translation of the International Network Routing Address will take place. 3.3 within the Serving Service Providers network, which generates the INRA. The use of AI is optional. additional address (AA): An address item, which is used to identify a specific terminati
32、on destination country code for INRA (DCCI): Country Code identifying the country in additional identity (AI): An identity element that may be used to identify a specific point ITU-T E.353 (02/2001) 1 3.4 called party number (CPN): A combination of digits used by the network to reach a subscriber or
33、 service (called party). The Called Party Number is normally the Dialled Digits (DD) without a prefix. The Called Party Number may be an E. 164 number. 3.5 country code for global service: A three-digit Country Code to identify a global service. 3.6 dialled digits: A combination of digits dialled by
34、 the calling party (caller) to reach a subscriber or service. The dialled digit is normally not an E.164 number because it may include a prefix. 3.7 global subscriber number (GSN): A number identifying a subscriber for a particular global service. 3.8 global service: A service defined by ITU-T, prov
35、isioned on the public switched network, to which ITU-T has assigned a specific country code to enable the provision of that international service between two or more countries and/or integrated numbering plans. 3.9 international network routing address (INRA): An address that is derived and used by
36、the network to route the call towards the service provider for the dialled (called) E.164 number. The INRA is not an E. 164 number, and is not diallable. 3.10 national (significant) number (N(S)N): The national (significant) number consists of the National Destination Code (NDC) followed by the Subs
37、criber Number (SN). The function and format of N(S)N is nationally determined. For further details refer to ITU-T E. 164. 3.11 national destination code: A national optional code field, within the E.164 number plan, which combined with the Subscribers number (SN) will constitute the national (signif
38、icant) number of the international public telecommunication service for geographic areas. For further details refer 3.12 originating country code for INRA (OCCI): Originating Country Code for INRA identifies the country where the International Network Routing Address (INRA) is generated. 3.13 destin
39、ation service provider address (DSPA): An address which identifies a service provider within a country for the dialled digits. 3.14 serving service provider (SSP): A service provider that generates the INRA routing information from the dialled digits. The functionality to provide these capabilities
40、may reside in either the originating or transit networks. 3.15 serving service provider identity (SSPI): An identity which identifies the Serving Service Provider (SSP). The SSPI is not an E.164 number. to ITU-T E. 164. 4 Abbreviations This Recommendation uses the following abbreviations: AA Additio
41、nal Address AI Additional Identity CPN Called Party Number DCCI Destination Country Code for INRA DD Dialled Digits DSPA Destination Service Provider Address GSN Global Subscriber Number INRA International Network Routing Address ISDN Integrated Services Digital Network ISUP ISDN User Part 2 ITU-T E
42、.353 (02/2001) ITU-T NSN OCCI ON SN SSP SSPI TP TSB 5 5.1 International Telecommunication Union - Telecommunication Standardization Sector National Significant Number Originating Country Code for INRA Originating Network Subscriber Number Serving Service Provider Serving Service Provider Identity Te
43、rmination Point Telecommunication Standardization Bureau Formats and structure International network routing address (INRA) The International Network Routing Address (INRA) is composed of a number of digits arranged in specific code fields. The INRA code fields are Destination Country Code for INRA
44、(DCCI), Destination Service Provider Address (DSPA) and an Additional Address field (AA). Figure 1 shows the International Network Routing Address (INRA) structure. 3 digits u 5 digits 5 digits I International Network Routing Address (INRA) I 7, T0.208430-M) AA Additional Address DCCI DSPA Destinati
45、on Service Provider Address Destination Country Code for INRA Figure 1E.353 - International network routing address (INRA) The Additional Address (AA) field is optional. 5.2 The Serving Service Provider Identity (SSPI) is composed of a number of digits arranged in specific code fields. The SSPI code
46、 fields are Originating Country Code for INRA (OCCI), the Serving Service Provider (SSP), which generates the INRA, and an Additional Identity (AI) field. See Figure 2. Serving service provider identity (SSPI) ITU-T E.353 (02/2001) 3 pq l I 3 digits P 5 digits 5 digits I SSP I IAII I I l I l I l l I
47、4 Serving Service Provider Identity (SSPI) TO.208440-W AI Additional Identity OCCI Originating Country Code for INRA SSP Serving Service Provider Figure 2E.353 -Serving service provider identity (SSPI) The Additional Identity (AI) field is optional. 6 Principles for how the international network rou
48、ting address information works This Recommendation addresses information required to be able to route calls when using International Network Routing Addresses. Two different information items are necessary: a) b) The INRA and SSPI do not conform to the E.164 number structure. The International Netwo
49、rk Routing Address INRA is created and used by the Serving Service Provider, which is generating the INRA routing information, to route a call towards the Service Provider for the dialled digits. The Serving Service Provider Identity (SSPI) identifies the Serving Service Provider (SSP), which is responsible for generating the INRA routing information. It is recommended that the two information items, INRA and SSPI, use the same format. To enable efficient routing and address interworking between international service providers, it is desirable that the international network use a common
