INTERNATIONAL TELECOMMUNICATION UNION
`
`)45(cid:13)4
`
`TELECOMMUNICATION
`STANDARDIZATION SECTOR
`OF ITU
`
`%(cid:14)(cid:17)(cid:22)(cid:20)
`
`(05/97)
`
`SERIES E: OVERALL NETWORK OPERATION,
`TELEPHONE SERVICE, SERVICE OPERATION AND
`HUMAN FACTORS
`Operation, numbering, routing and mobile services –
`International operation – Numbering plan of the
`international telephone service
`
`4HE(cid:0)INTERNATIONAL(cid:0)PUBLIC(cid:0)TELECOMMUNICATION
`NUMBERING(cid:0)PLAN
`
`ITU-T Recommendation E.164
`
`(Previously CCITT Recommendation)
`
`AT&T Exhibit 1014
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`

`

`ITU-T E-SERIES RECOMMENDATIONS
`
`OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN
`FACTORS
`
`OPERATION, NUMBERING, ROUTING AND MOBILE SERVICES
`INTERNATIONAL OPERATION
`Definitions
`General provisions concerning Administrations
`General provisions concerning users
`Operation of international telephone services
`Numbering plan of the international telephone service
`International routing plan
`Tones in national signalling systems
`Maritime mobile service and public land mobile service
`OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN
`THE INTERNATIONAL TELEPHONE SERVICE
`Charging in the international telephone service
`Procedures for remuneration of Administrations for facilities made available
`Measuring and recording call durations for accounting purposes
`Establishment and exchange of international accounts
`UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-
`TELEPHONY APPLICATIONS
`General
`Phototelegraphy
`ISDN PROVISIONS CONCERNING USERS
`QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING
`NETWORK MANAGEMENT
`TRAFFIC ENGINEERING
`QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS,
`OBJECTIVES AND DEPENDABILITY PLANNING
`
`E.100–E.229
`E.100–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.199
`E.200–E.229
`E.230–E.299
`
`E.230–E.249
`E.250–E.259
`E.260–E.269
`E.270–E.299
`E.300–E.329
`
`E.300–E.319
`E.320–E.329
`E.330–E.399
`
`E.400–E.489
`E.490–E.799
`E.800–E.899
`
`For further details, please refer to ITU-T List of Recommendations.
`
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`ITU-T RECOMMENDATION E.164
`
`THE INTERNATIONAL PUBLIC
`TELECOMMUNICATION NUMBERING PLAN
`
`Summary
`
`This Recommendation provides the number structure and functionality for the three categories of numbers used for
`international public telecommunication – they are geographic areas, global services and Networks. For each of the
`categories, it details the components of the numbering structure and the digit analysis required to successfully route the
`calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides
`information on network identification, service parameters, calling/connected line identity, dialling procedures and
`addressing for geographic-based ISDN calls. Specific E.164-based applications which differ in usage are defined in
`separate Recommendations.
`
`Source
`
`ITU-T Recommendation E.164 was revised by ITU-T Study Group 2 (1997-2000) and was approved under the WTSC
`Resolution No. 1 procedure on the 26th of May 1997.
`
`Recommendation E.164 (05/97)
`
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`FOREWORD
`
`ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni-
`cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is
`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 Conference (WTSC), which meets every four years, establishes the
`topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics.
`
`The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC
`Resolution No. 1.
`
`In some areas of information technology which fall within ITU-T’s purview, the necessary standards are prepared on a
`collaborative basis with ISO 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
`
`The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the
`use of a claimed Intellectual Property Right. The 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.
`
`As of the date of approval of this Recommendation, the ITU had/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 urged to consult the TSB patent database.
`
`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 the ITU.
`
` ITU 1997
`
`ii
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`ª
`

`

`8
`
`9
`
`1
`2
`3
`4
`5
`6
`
`7
`
`Introduction ....................................................................................................................................................
`Scope..............................................................................................................................................................
`References ......................................................................................................................................................
`Definitions......................................................................................................................................................
`Abbreviations .................................................................................................................................................
`International public telecommunication number structure.............................................................................
`6.1
`International public telecommunication number length ...................................................................
`6.2
`Structure of the international public telecommunication number.....................................................
`6.3
`Assignment of Country Codes (CCs) ...............................................................................................
`6.4
`Assignment of Identification Codes .................................................................................................
`International public telecommunication number for geographic areas ..........................................................
`7.1
`Country Code for geographic areas ..................................................................................................
`7.2
`National (significant) number...........................................................................................................
`7.3
`Prefixes .............................................................................................................................................
`7.4
`National numbering plan ..................................................................................................................
`7.5
`Digit analysis ....................................................................................................................................
`International public telecommunication number for global services .............................................................
`8.1
`Country Code for global services .....................................................................................................
`8.2
`Global Subscriber Number ...............................................................................................................
`8.3
`Digit analysis ....................................................................................................................................
`8.4
`Evolution path to an international public telecommunication number for global services...............
`International public telecommunication number for Networks......................................................................
`9.1
`Country Code for Networks..............................................................................................................
`9.2
`Identification Code ...........................................................................................................................
`9.3
`Subscriber Numbers..........................................................................................................................
`9.4
`Digit analysis ....................................................................................................................................
`Escape codes ..................................................................................................................................................
`10
`International prefix.........................................................................................................................................
`11
`Recommendation history................................................................................................................................
`12
`Annex A – Clarification and explanation of the structure and function of E.164 numbers ......................................
`A.1
`Scope ................................................................................................................................................
`A.2
`Structure............................................................................................................................................
`A.3
`Number length ..................................................................................................................................
`A.4
`Unique identification of international number for geographic areas ................................................
`A.5
`Unique identification of international number for global services ...................................................
`A.6
`Unique identification of international number for Networks ...........................................................
`A.7
`Non-E.164 numbers..........................................................................................................................
`Annex B – Application of international public telecommunication numbers for ISDN ...........................................
`B.1
`Scope ................................................................................................................................................
`B.2
`ISDN numbers ..................................................................................................................................
`B.3
`Addressing ........................................................................................................................................
`B.4
`Dialling procedures...........................................................................................................................
`B.5
`Network identification ......................................................................................................................
`B.6
`Service parameters............................................................................................................................
`B.7
`Calling/connected line identity .........................................................................................................
`
`CONTENTS
`
`Page
`1
`1
`1
`2
`5
`6
`6
`6
`7
`8
`8
`8
`8
`9
`10
`10
`11
`11
`11
`11
`11
`12
`12
`12
`12
`12
`12
`12
`13
`13
`13
`13
`13
`15
`15
`15
`15
`17
`17
`17
`17
`18
`18
`19
`19
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`AT&T Exhibit 1014
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`AT&T Exhibit 1014
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`
`

`

`Recommendation E.164
`
`Recommendation E.164 (05/97)
`
`1
`
`Introduction
`
`THE INTERNATIONAL PUBLIC
`TELECOMMUNICATION NUMBERING PLAN
`
` (revised in 1997)
`
`The rapid advances in telecommunication technology coupled with increased diversification of customer demands
`served by a number of different types of dedicated public switched networks (telephone, telex, data, etc.) have created a
`need to provide a uniform customer access to the multitude of network structures (i.e. ISDN, IN, etc.). Implementation
`of these network architectures has begun in a number of countries and eventually these will be able to carry the full
`range of existing and new services.
`
`To provide a broad base for these new arrangements, numbering has been kept compatible with that originally
`established for international telephone service. As covered in this Recommendation, numbering for ISDN and the
`international telephone service are an integral part of this international telecommunication numbering plan.
`
`2
`
`Scope
`
`This Recommendation provides the number structure and functionality for the three categories of numbers used for
`international public telecommunication – they are geographic areas, global services, and Networks. For each of the
`categories, it details the components of the numbering structure and the digit analysis required to successfully route the
`calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides
`information on network identification, service parameters, calling/connected line identity, dialling procedures and
`addressing for geographic-based ISDN calls. Specific E.164-based applications which differ in usage are defined in
`separate Recommendations, e.g. Recommendation E.168 – Application of E.164 numbering plan for UPT.
`
`References
`3
`The following ITU-T Recommendations and other references contain provisions which, through reference in this text,
`constitute provisions of this Recommendation. At the time of the publication, the editions indicated were valid. All
`Recommendations and other references are subject to revision. All users of this Recommendation are therefore
`encouraged to investigate the possibility of applying the most recent edition of the Recommendation and other
`references listed below. A list of the current valid ITU-T Recommendations is regularly published.
`
`–
`
`–
`
`–
`
`–
`
`–
`
`CCITT Recommendation E.123 (1988), Notation for national and international telephone numbers.
`
`CCITT Recommendation E.131 (1988), Subscriber control procedures for supplementary telephone services.
`ITU-T Recommendation E.164.11, Criteria and procedures for the assignment of E.164 country codes and
`associated identification codes.
`
`CCITT Recommendation E.165 (1988), Timetable for coordinated implementation of the full capability of the
`numbering plan for the ISDN era (Recommendation E.164).
`
`ITU-T Recommendation E.165.1 (1996), Use of escape code "0" within the E.164 numbering plan during the
`transition period to implementation of NPI mechanism.
`
`_______________
`
`1 Presently at the stage of draft.
`
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`–
`
`–
`
`–
`
`–
`
`–
`
`–
`
`–
`
`–
`
`–
`
`4
`
`ITU-T Recommendation E.166/X.122 (1996), Numbering plan interworking for the E.164 and X.121
`numbering plans.
`
`ITU-T Recommendation E.168 (1993), Application of E.164 numbering plan for UPT.
`
`ITU-T Recommendation E.169 (1996), Application of Recommendation E.164 numbering plan for universal
`international freephone numbers for international freephone service.
`
`ITU-T Recommendation E.190 (1997), Principles and responsibilities for the management, assignment and
`reclamation of E-Series international numbering resources.
`
`ITU-T Recommendation E.191 (1996), B-ISDN numbering and addressing.
`
`CCITT Recommendation E.213 (1988), Telephone and ISDN numbering plan for land mobile stations in
`Public Land Mobile Networks (PLMN).
`
`CCITT Recommendation E.214 (1988), Structure for the land mobile global title for the Signalling
`Connection Control Part (SCCP).
`
`CCITT Recommendation E.331 (1991), Minimum user-terminal interface for a human user entering address
`information into an ISDN terminal.
`
`CCITT Recommendation I.330 (1988), ISDN numbering and addressing principles.
`
`Definitions
`
`Within the integrated service environment, the terms used for all networks and services must be compatible and
`consistent. This Recommendation defines the following terms.
`
`4.1
`
`number
`
`F: numéro
`S: número
`
`A string of decimal digits that uniquely indicates the public network termination point. The number contains the
`information necessary to route the call to this termination point.
`
`A number can be in a format determined nationally or in an international format. The international format is known as
`the International Public Telecommunication Number which includes the country code and subsequent digits, but not the
`international prefix.
`
`4.2
`
`numbering plan
`
`F: plan de numérotage
`S: plan de numeración
`
`A numbering plan specifies the format and structure of the numbers used within that plan. It typically consists of decimal
`digits segmented into groups in order to identify specific elements used for identification, routing and charging capa-
`bilities, e.g. within E.164 to identify countries, national destinations, and subscribers.
`
`A numbering plan does not include prefixes, suffixes, and additional information required to complete a call.
`The national2 numbering plan is the national implementation of the E.164 numbering plan.
`
`_______________
`
`2 For the purposes of this Recommendation, national is defined as a country, group of countries, global service or Network.
`
`2
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`4.3
`
`dialling plan
`
`F: plan de numérotation
`S: plan de marcación
`
`A string or combination of decimal digits, symbols, and additional information that defines the method by which the
`numbering plan is used. A dialling plan includes the use of prefixes, suffixes, and additional information, supplemental
`to the numbering plan, required to complete the call.
`
`4.4
`
`address
`
`F: adresse
`S: dirección
`
`A string or combination of decimal digits, symbols, and additional information which identifies the specific termination
`point(s) of a connection in a public network(s) or, where applicable, in interconnected private network(s).
`
`4.5
`
`prefix
`
`F: préfixe
`S: prefijo
`
`A prefix is an indicator consisting of one or more digits, that allows the selection of different types of number formats,
`networks and/or service.
`
`4.6
`
`international prefix
`
`F: préfixe international
`S: prefijo internacional
`
`A digit or combination of digits used to indicate that the number following is an International Public Telecommunication
`Number.
`
`4.7
`
`country code (CC) for geographic areas
`
`F: indicatif de pays pour zones géographiques
`S: indicativo de país para áreas geográficas
`
`The combination of one, two or three digits identifying a specific country, countries in an integrated numbering plan, or
`a specific geographic area.
`
`4.8
`
`national (significant) number [N(S)N]
`
`F: numéro national (significatif) [N(S)N]
`S: número nacional (significativo) [N(S)N]
`
`That portion of the number that follows the country code for geographic areas. The national (significant) number
`consists of the National Destination Code (NDC) followed by the Subscriber Number (SN). The function and format of
`the N(S)N is nationally determined.
`
`4.9
`
`national destination code (NDC)
`
`F: indicatif national de destination (NDC)
`S: indicativo nacional de destino (NDC)
`
`A nationally optional code field, within the E.164 number plan, which combined with the Subscriber’s Number (SN) will
`constitute the national (significant) number of the international public telecommunication number for geographic areas.
`The NDC will have a network and/or trunk code selection function.
`
`The NDC can be a decimal digit or a combination of decimal digits (not including any prefix) identifying a numbering
`area within a country (or group of countries included in one integrated numbering plan or a specific geographic area)
`and/or network/services.
`
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`4.10
`
`national (trunk) prefix
`
`F: préfixe (interurbain) national
`S: prefijo (interurbano) nacional
`
`A digit or combination of digits used by a calling subscriber, making a call to a subscriber in his own country but outside
`his own numbering area. It provides access to the automatic outgoing trunk equipment.
`
`4.11
`
`trunk code (TC)
`
`F: indicatif interurbain (TC)
`S: indicativo interurbano (TC)
`
`A digit or combination of digits, not including the national (trunk) prefix, identifying the numbering area within a
`country (or group of countries included in one integrated numbering plan or a specific geographic area).
`
`The trunk code has to be used before the called subscriber’s number when the calling and called subscribers are in
`different numbering areas. The trunk code is a particular application of NDC.
`
`4.12
`
`destination network (DN) code
`
`F: indicatif de réseau de destination (DN)
`S: indicativo de red de destino (DN)
`
`An optional code field within the E.164 numbering plan which identifies the destination network serving the destination
`subscriber. It performs the destination network selection function of the NDC. In some instances it can be combined with
`a trunk code to form the NDC. The DN code can be a decimal digit or a combination of decimal digits (not including any
`prefix).
`
`4.13
`
`country code (CC) for global services
`
`F: indicatif de pays pour les services mondiaux
`S: indicativo de país para servicios mundiales
`
`A 3-digit Country Code used to identify the global service.
`
`4.14
`
`global service
`
`F: service mondial
`S: servicio mundial
`
`A service defined by the ITU-T, provisioned on the public switched network, to which the 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.
`
`4.15
`
`global subscriber number (GSN)
`
`F: numéro d'abonné mondial (GSN)
`S: número de abonado mundial (GSN)
`
`The number identifying a subscriber for a particular global service.
`
`4.16
`
`country code (CC) for Networks
`
`F: indicatif de pays pour les Réseaux
`S: indicativo de país para Redes
`
`A shared 3-digit Country Code used in combination with an identification code to identify an international Network.
`
`4.17
`
`Network
`
`F: Réseau
`S: Red
`
`Internationally interconnected physical nodes and operational systems operated and maintained by one or more ROAs to
`provide public telecommunications services. Private networks are not included in this definition. Note that the use of
`capital "N" in Networks indicates that this definition applies.
`
`4
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`4.18
`
`identification code (IC)
`
`F: code d’identification (IC)
`S: código de identificación (SC)
`
`The code subsequent to a shared E.164 country code that uniquely identifies an international Network.
`
`4.19
`
`subscriber number (SN)
`
`F: numéro d'abonné (SN)
`S: número de abonado (SN)
`
`The number identifying a subscriber in a network or numbering area.
`
`4.20
`
`escape code
`
`F: code d'échappement
`S: código de escape
`
`One or more digits which indicate that the digits that follow are from a specific numbering plan which is different from
`the originating numbering plan.
`
`An escape code can be carried forward through the originating network and can be carried across internetwork and
`international boundaries. Therefore the digits used for escape codes should be standardized.
`
`5
`
`Abbreviations
`
`This Recommendation uses the following abbreviations.
`
`CC
`
`Country Code
`
`CCITT
`
`International Telegraph and Telephone Consultative Committee
`
`CDLI
`
`CLI
`
`COLI
`
`DN
`
`GSN
`
`IC
`
`IN
`
`ISDN
`
`ITU
`
`Called Line Identity
`
`Calling Line Identity
`
`Connected Line Identity
`
`Destination Network
`
`Global Subscriber Number
`
`Identification Code
`
`Intelligent Network
`
`Integrated Services Digital Network
`
`International Telecommunication Union
`
`ITU-T
`
`International Telecommunication Union – Telecommunication Standardization Sector
`
`NDC
`
`NPI
`
`National Destination Code
`
`Numbering Plan Identifier
`
`N(S)N
`
`National (Significant) Number
`
`NT2
`
`PSTN
`
`ROA
`
`SA
`
`SN
`
`TC
`
`Network Termination 2
`
`Public Switched Telephone Network
`
`Recognized Operating Agency
`
`Sub-Address
`
`Subscriber Number
`
`Trunk Code
`
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`TON
`
`TSB
`
`Type of Number
`
`Telecommunication Standardization Bureau
`
`UIFN
`
`Universal International Freephone Number
`
`6
`
`International public telecommunication number structure
`
`This clause identifies three different structures for the international public telecommunication number:
`•
`•
`•
`
`International public telecommunication number for geographic areas.
`
`International public telecommunication number for global services.
`
`International public telecommunication number for Networks.
`
`6.1
`
`International public telecommunication number length
`
`The ITU-T recommends that the maximum number of digits for the international geographic, global services, and
`network applications should be 15 (excluding the international prefix). Administrations are invited to do their utmost to
`limit the digits to be dialled to the degree possible consistent with the service needs.
`
`6.2
`
`Structure of the international public telecommunication number
`
`6.2.1
`The international public telecommunication number for geographic areas (Figure 1) is composed of a variable
`number of decimal digits arranged in specific code fields. The international public telecommunication number code
`fields are the Country Code (CC) and the National (Significant) Number N(S)N .
`
`Figure 1 shows the international public telecommunication number structure for geographic areas.
`
`CC
`
`NDC
`
`SN
`
`1 to 3 digits
`
`Max (15-n) digits
`
`National (significant) number
`Max 15 digits
`
`International public telecommunication
`number for geographic areas
`
`T0206150-96/d01
`
`CC Country Code for geographic areas
`NDC National Destination Code (optional)
`SN
`Subscriber Number
`n
`Number of digits in the country code
`
`NOTE – National and international prefixes are not part of the international public telecommunication number for
`geographic areas.
`
`Figure 1/E.164 – International public telecommunication number structure for geographic areas
`
`FIGURE 1/M.3020...[D01] = 3 CM
`
`6.2.2
`The international public telecommunication number for global services (Figure 2) is composed of decimal
`digits that vary depending on the specific service. The international service number code fields are the 3-digit country
`code and the Global Subscriber Number (GSN).
`
`Figure 2 shows the international public telecommunication number structure for global services. The use of this format is
`service specific and is dependent on the numbering requirements as detailed in the appropriate Recommendation,
`e.g. Recommendation E.169 – Application of Recommendation E.164 numbering plan for universal international
`freephone numbers for international freephone service.
`
`6
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`CC
`
`3 digits
`
`GSN
`
`Max 12 digits
`
`Max 15 digits
`
`International public telecommunication
`number for global services
`
`T0206160-96/d02
`
`CC Country Code for Global Services
`GSN Global Subscriber Number
`
`NOTE – National and international prefixes are not considered to be part of the international public telecommuni-
`cation number for global services.
`
`Figure 2/E.164 – International public telecommunication number structure for global services
`
`FIGURE 1/M.3020...[D01] = 3 CM
`
`6.2.3
`The international public telecommunication number for Networks (Figure 3) is composed of decimal digits
`arranged in three code fields. The code fields are the 3-digit shared Country Code (CC) field, the IC field, which varies
`in length between 1 to 4 digits, and the Subscriber Number (SN) which can be up to 15 minus the number of digits in the
`CC and IC fields.
`
`Figure 3 shows the international public telecommunication number for Networks.
`
`CC
`
`3 digits
`
`IC
`
`SN
`
`1 to 4 digits
`
`Max (12-x) digits
`
`Max 12 digits
`
`Max 15 digits
`International public telecommunication
`number for networks
`
`T0206170-96/d03
`
`CC Country Code for Networks
`IC
`Identification Code
`SN
`Subscriber Number
`x
`Number of digits in Identification Code (IC)
`
`NOTE – National and international prefixes are not part of the international public telecommunication number for
`Networks.
`
`Figure 3/E.164 – International public telecommunication number structure for Networks
`
`FIGURE 1/M.3020...[D01] = 3 CM
`
`6.3
`
`Assignment of Country Codes (CCs)
`
`6.3.1
`
`Country codes may be assigned to either geographic areas, global services or shared among Networks.
`
`Recommendation E.164 (05/97)
`
`7
`
`AT&T Exhibit 1014
`AT&T v. VoIP, IPR 2017-01382, Page 13
`
`

`

`6.3.2
`the TSB.
`
`The status of country codes for geographic areas, global services, and Networks is published periodically by
`
`6.3.3
`
`All spare country codes will be assigned on a three-digit basis.
`
`6.3.4
`The assignment and reservation of country codes shall follow the criteria and procedures as defined in
`Recommendation E.164.1.
`
`6.4
`
`Assignment of Identification Codes
`
`6.4.1
`The list of assigned and reserved identification codes with their associated country codes is published
`periodically by the TSB.
`
`6.4.2
`The assignment and reservation of identification codes shall follow the criteria and procedures as defined in
`Recommendation E.164.1.
`
`7
`
`International public telecommunication number for geographic areas
`
`Principles, criteria and procedures for the assignment of international public telecommunication numbers for geographic
`areas may be found in Recommendations E.190 and E.164.1.
`
`Country Code for geographic areas
`7.1
`The Country Code is used to select the destination country3 and varies in length from 1 to 3 digits.
`
`7.2
`
`National (significant) number
`
`7.2.1
`The ITU-T recommends that the maximum number of digits of the National (Significant) Number, N(S)N,
`should be equal to 15-n, where n is the number of digits of the country code.
`
`7.2.2
`The N(S)N is used to select the destination subscriber. In selecting the destination subscriber, however, it may
`be necessary to select a destination network. To accomplish this selection, the N(S)N code field comprises a National
`Destination Code (NDC) followed by the Subscriber’s Number (SN). The NDC and SN may be inseparably connected in
`some national applications to form a single composite dialling sequence.
`
`7.2.3
`The NDC field, if used, will be variable in length depending upon the requirements of the destination country.
`Each NDC may have one of the following structures:
`a)
`a Destination Network (DN) code, which can be used to select a destination network serving the destination
`subscribers;
`a Trunk Code (TC);
`any combination of Destination Network (DN) code and Trunk Code (TC).
`
`b)
`c)
`
`The NDCs of an Administration may consist of one of the above structures or others as defined by national
`Administrations.
`NOTE – The sequences DN-TC and TC-DN are a national matter. The various NDC options (TC/DN) are reflected in Figure 4.
`
`7.2.4
`
`The SN varies in length depending on the requirements of the destination country.
`
`7.2.5
`Where appropriate, identification of a specific network within the destination country shall be through the use
`of a NDC incorporated in the public telecommunication number.
`
`_______________
`
`3 Whenever the term country, destination country or originating country is used in this subclause, it identifies a specific country, a
`group of countries in an integrated numbering plan or a specific geographical area.
`
`8
`
`Recommendation E.164 (05/97)
`
`AT&T Exhibit 1014
`AT&T v. VoIP, IPR 2017-01382, Page 14
`
`

`

`NDC Structure
`
`Type 1
`
`NDC Structure
`
`Type 2
`
`NDC Structure
`
`Type 3
`
`NDC Structure
`
`Type 4
`
`DN
`
`TC
`
`DN
`
`TC
`
`TC
`
`DN
`
`T0206180-96/d04
`
`Figure 4/E.164 – Options for NDC structure
`
`FIGURE 1/M.3020...[D01] = 3 CM
`
`7.3
`
`Prefixes
`
`7.3.1
`
`Applications
`
`A prefix is an indicator consisting of one or more digits that allows the selection of different types of number formats,
`networks and/or service. Prefixes are not part of the number and are not signalled over international boundaries. It is a
`national matter to decide whether prefixes can be signalled between domestic networks.
`
`Prefixes can also be used for c