ETSI TS 184 011 V3.1.1 (2011-02)

Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Requirements and usage of E.164 numbers in NGN and NGCN

DTS/TISPAN-04018-NGN-R3

General Information

• Status: Published
• Publication Date: 01-Feb-2011
• Technical Committee: TISPAN 4 - TISPAN Numbering Addressing and routing
• Current Stage: 12 - Completion
• Due Date: 07-Feb-2011
• Completion Date: 02-Feb-2011

Standards Content (Sample)

Technical Specification
Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Requirements and usage of E.164 numbers in NGN and NGCN

2 ETSI TS 184 011 V3.1.1 (2011-02)

Reference
DTS/TISPAN-04018-NGN-R3
Keywords
addressing, ENUM
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ETSI
3 ETSI TS 184 011 V3.1.1 (2011-02)

Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 6
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Structure of Numbers . 7
5 E.164 numbers formats and coding used in NGNs . 8
5.1 General . 8
5.2 International E.164 number format . 9
5.2.1 Use of International E.164 number . 9
5.2.2 Use of dialled digits for International E.164 number . 10
5.3 Use of National E.164 number format. 10
5.4 Use of dialled digits for the determination of valid coding formats for E.164 number . 11
5.4.1 Format of the Request URI at UNI . 11
5.4.2 Processing of the Request URI received over the UNI . 13
5.5 Numbering and Addressing Resolution function for E.164 numbers . 13
6 E.164 numbers in NGCN . 14
6.1 General . 14
6.2 Use of E.164 numbers in the NGCN . 14
7 Numbering normative statements . 15
Annex A (informative): Use of private numbers in the NGCN . 16
Annex B (informative): Bibliography . 17
History . 18

ETSI
4 ETSI TS 184 011 V3.1.1 (2011-02)

Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
Introduction
NGN is intended to provide an efficient, secure and trustworthy numbering, naming and addressing environment for
users, network operators and service providers. Evolution to NGN will ensure that the sovereignty of ITU Member
States with regard to numbering plan is fully maintained, as described in ITU-T Recommendation E.164 [2].
The present document is aligned with the definitions, based on recent ITU-T Recommendation E.101 [1], and provides
requirements and related solutions (i.e. formats and coding) for E.164 number used as NGN's and NGCN's Identifier for
both IMS and not-IMS based on ETSI/3GPP standards.
The present document looks at the description of the different E.164 numbers and requirements for numbering, naming
and addressing in NGN and NGCN contexts considering that the existing dialling procedures (using TE) will be kept.
ETSI
5 ETSI TS 184 011 V3.1.1 (2011-02)

1 Scope
The present document provides an alignment of definitions on E.164 numbers, based on ITU-T Recommendation
E.101 [1]. It provides requirements and describes the manner the numbers will be used within NGN and NGCN
environments. Naming issues related to NGCN are out of the scope for the moment. The support of national-only
numbers is a national matter and is not addressed in the present document. The document deals with "geographic
country codes" (i.e. geographic areas or groups of countries) and their associated dialling plans, not with the
international E.164 numbering plan as a whole. Non geographic country codes (such as country codes for networks) are
not addressed in the present document.
Clause 7 defines the normative statements for numbering use in NGN.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ITU-T Recommendation E.101 (2009): "Definitions of terms used for identifiers (names, numbers,
addresses and other identifiers) for public telecommunication services and networks in the
E-Series Recommendation".
[2] ITU-T Recommendation E.164 (2010): "The international public telecommunication numbering
plan".
[3] ITU-T Recommendation E.123 (2001): "Notation for national and international telephone
numbers, e-mail addresses and Web addresses".
[4] ITU-T Recommendation Q.3401 (2007): "NGN NNI signalling profile (protocol set 1)".
[5] ITU-T Recommendation Q.3402 (2008): "NGN UNI signalling profile (protocol set 1)".
[6] ETSI TS 184 006: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Interconnection and Routeing requirements related to
Numbering and Naming for NGNs; NAR Interconnect".
[7] ETSI TS 124 229(V8.7.0): "Digital cellular telecommunications system (Phase 2+); Universal
Mobile Telecommunications System (UMTS); LTE; Internet Protocol (IP) multimedia call control
protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP);
Stage 3 (3GPP TS 24.229 version 8.7.0).
[8] ETSI TS 123 228: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Stage 2
(3GPP TS 23.228)".
[9] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture".
ETSI
6 ETSI TS 184 011 V3.1.1 (2011-02)

[10] ETSI TS 182 024: "Telecommunications and Internet Converged Services and Protocols for
Advanced Networking (TISPAN); Hosted Enterprise Services; Architecture, functional description
and signalling".
[11] IETF RFC 3966: "The tel URI for Telephone Numbers".
[12] IETF RFC 3261: "SIP: Session Initiation Protocol".
[13] IETF RFC 4967: "Dial String Parameter for the Session Initiation Protocol Uniform Resource
Identifier".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 184 007: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Naming/Numbering Address Resolution (NAR)".
[i.2] IETF RFC 1034: "Domain Names - Concepts and Facilities".
[i.3] IETF RFC 1035: "Domain Names - Implementation and Specification".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ITU-T Recommendation E.101 [1] and the
following apply:
national-only number: As defined in ITU-T Recommendation E.101 [1].
global number: International E.164 number as defined in ITU-T Recommendation E.101 [1] and described in
RFC 3966 [11].
local number: National E.164 number or a national-only number as defined in ITU-T Recommendation E.101 [1] and
described in RFC 3966 [11].
tel URI: As defined in RFC 3966 [11].
SIP URI: As defined in RFC 3261 [12] and reflected also in clause 4.2 TS 124 229 [7].
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CC Country Code
CSCF Call Session Control Function
DDI Direct-Dial-In
ENUM Telephone Number Mapping
GSM Global System for Mobile Communications
I-ENUM Infrastructure ENUM
IMS IP Multimedia Subsystem
IP Internet Protocol
ISDN Integrated Services Digital Networks
N(S)N National (Significant) Number
NAR Naming and Addressing Resolution
NDC National Destination Code
NGCN Next Generation Corporate Network
ETSI
7 ETSI TS 184 011 V3.1.1 (2011-02)

NGN Next Generation Network
NNI Network-Network-Interface
NPA Numbering Plan Administrator
PLMN Public Land Mobile Network
PSTN Public Switched Telephone Network
SIP Session Initiation Protocol
SIPS SIP Secure
SN Subscriber Number
UE User Equipment
UMTS Universal Mobile Telecommunications System
UNI User-Network-Interface
URI Uniform Resource Identifier
4 Structure of Numbers
Each country defines its own national numbering and the national dialling plan, based on ITU-T Recommendation
E.164 [2], as well as the prefixes and how the national formats (i.e. the local and national level) are used.
Subscribers in other countries are always reached by dialling the international prefix and the international E.164
number.
International E.164 numbers are numbers based on ITU-T Recommendation E.164 [2] and are used in different network
environments like PSTN, ISDN, and PLMNs based on GSM and UMTS, and are also used in NGNs as public
identifiers.
The international E.164 number uniquely identifies a subscriber or a point where a service is provided and satisfies the
three characteristics of structure, number length and uniqueness as specified in E.164 [2]. The maximum number of
digits for the E.164 number is 15 excluding the international prefix. International E.164 numbers are presently used in
five different structures and these are described in detail in E.164 [2]:
• International E.164-number for geographic areas.
• International E.164-number for global services.
• International E.164-number for Networks.
• International E.164-number for Groups of Countries.
• International E.164-number for Trials.
The structure of the international E.164 number for geographic areas, as an example, is shown below taken from ITU-T
Recommendation E.164 [2]:
Figure 1: International E.164 number structure for geographic areas
ETSI
8 ETSI TS 184 011 V3.1.1 (2011-02)

An E.164 number of the own country can be used in different formats by the users and operators, the ones
corresponding to: international level, national level and local level. Which of these formats are usable is dependant on
the national E.164 numbering plan and the dialling plan.
The following three notes describe the different formats which are national specifics:
NOTE 1: International level:
Some networks allow to dial the national E.164 numbers of the own country in the international format by
using the international prefix.
NOTE 2 National level:
On the national level the number is used in the national (significant) number [N(S)N] format, i.e. the
National Destination Code (NDC) and the Subscriber Number (SN), possibly together with the national
(trunk) prefix.
NOTE 3 Local level (Subscriber number):
In some national dialling plans, using an open dialling plan, a user may also dial an E.164 number in the
local format. This means dialling just the subscriber number (SN) without any national destination code.
This dialling procedure might not be applicable in some countries and networks, using closed dialling
plans. In this case, there is always an NDC required to access other national E.164 numbers in the same
area.
Countries with a closed dialling plan do not have a local format. This may also be the case for certain
networks (mostly mobile networks). In some countries with a closed dialling plan there is no NDC
required to be dialled.
5 E.164 numbers formats and coding used in NGNs
5.1 General
From the technical point of view, an ETSI's NGN is an IP-based network with control/service and transport layers and
SIP signalling. E.164 numbers can be used to identify the users and service entities.
From the signalling protocol point of view, E.164 numbers are conveyed using tel URI and/or SIP URI formats and
coding (see [4], [5] and [7]). As a consequence, for routeing purpose, tel URI and SIP URI have to be mapped to
appropriate IP addresses, associated to control/service functional entities, for communication establishing. In the ETSI's
NGN context, both tel URI and SIP URI are to be considered the "naming" schemes and SIP coding for E.164 numbers.
The basic coding for E.164 numbers in SIP are the following:
• tel:
for the purpose of the present document the is addressed by a "global number" or
"local number".
• sip: @;user=phone
For the purpose of the present document the is an E.164 number. The shall be a
string that identifies the operator serving the end user identified by the E.164 number on a contractual
basis, following the rules on Internet domain names for the domain administration (see [i.2] and [i.3]).
Figure 2 describes the basic scenario that shows the exchange of E.164 format information at UNI and NNI in ETSI
NGN functional architecture [9].
ETSI
9 ETSI TS 184 011 V3.1.1 (2011-02)

E.164 Formats and SIP Coding E.164 Formats and SIP Coding
between UE and NGN between NGNs

NGN A NGN B
UE
UNI
NNI
Figure 2: E.164 formats and SIP coding in NGN
The basic formats which can be used at the UNI are the following:
• International E.164 number: when the E.164 number is used in the international format, defined in Figure 1
(CC+NDC+SN), tel URI and SIP URI shall use the "global" coding defined in [11].
• National E.164 number: tel URI and SIP URI shall use the "local" coding defined in [11].
• Subscriber Number: tel URI and SIP URI shall use the "local" coding defined in [11].
For interconnection between NGNs (NNI) there exist two distinct cases:
• National interconnection – interconnection between operator networks belonging to the same country;
• International interconnection – interconnection between operator networks belonging to different countries.
"The "global" number coding for E.164 numbers shall be used at the national and international NNI. The number format
coding of the national interconnection NNI has also to take in account national requirements that are partially covered
in the document. Based on a national common agreement by Numbering Plan Administrator (NPA) for national NNI
other number coding formats (in particular local number coding) for E.164 numbers can be used."
5.2 International E.164 number format
5.2.1 Use of International E.164 number
An international E.164 number is a globally unique public identity of a subscriber or a service entity independent of
technologies and service context, for instance NGNs, PSTNs or PLMNs, etc. The use of international E.164 numbers is
mandatory at international interfaces between networks.
In case a number is delivered at NGN UNI, the NAR [i.1] translation function, realized inside the operator's domain,
shall resolve such a number into a SIP URI or a tel URI coding, which enables the use of other steps of routeing
process, also for interconnection scenarios.
In case a number is delivered at the PSTN/ISDN or PLMN UNI, no new requirements are provided on PSTN/ISDN
and, in the case of interworking with NGN, the numbering translation function at appropriate border gateways and
interworking functional entities will provide tel URI or SIP URI coding on SIP. See the following clauses for normative
requirements.
The basic numbering format for interconnection of international NGN networks shall be compliant to the Q.3401
Recommendation [4] and compliant to the following coding:
• tel: +
• sip: +@;user=phone
NOTE 1: The "user=phone" parameter is a SIP URI parameter used coherently with [7].
ETSI
10 ETSI TS 184 011 V3.1.1 (2011-02)

Both tel URI and SIP URI shall be adopted for the coding of international E.164 numbers for the international
interconnection [6].
The operator-domain naming component identifies the operator serving the end user identified by the E.164 number on
a contractual basis.
In principle, both Originating and Terminating party identifiers shall be provided at interconnection NNI. They shall be
coded in the SIP-header "P-Asserted-Identity" and in the "Request-URI", respectively.
NOTE 2: The "P-Asserted-Identity" SIP header can be omitted in case of a not trusted relationship between
networks.
E.164 number identifiers based on tel URI and SIP URI codings are handled to address NAR [i.1] for routeing process
and routable SIP URI determination [7], based on I-ENUM, as described in clause 4.3.5 of TS 123 228 [8], or on
another translation mechanism or existing solutions.
5.2.2 Use of dialled digits for International E.164 number
In order to use international E.164 numbers, a user may be required to first enter the international prefi
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