ETSI ETS 300 927 ed.2 (1998-10)

SLOVENSKI STANDARD
SIST ETS 300 927 E2:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Numbering, addressing
and identification (GSM 03.03 version 5.1.1)
Ta slovenski standard je istoveten z: ETS 300 927 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 927 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 927 E2:2003

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SIST ETS 300 927 E2:2003
EUROPEAN ETS 300 927
TELECOMMUNICATION October 1998
STANDARD Second Edition
Source: SMG Reference: RE/SMG-010303QR1
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Numbering, addressing and identification
(GSM 03.03 version 5.1.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1998. All rights reserved.

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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Standards Making Support Dept." at the address shown on the title page.

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Contents
Foreword . 5
1 Scope. 7
1.1 Normative references. 7
1.2 Abbreviations. 8
1.3 General comments to references. 8
1.4 Conventions on bitordering. 8
2 Identification of mobile subscribers. 8
2.1 General. 8
2.2 Composition of IMSI . 8
2.3 Allocation principles. 9
2.4 Structure of TMSI . 9
2.5 Structure of LMSI. 10
3 Numbering plan for mobile stations . 10
3.1 General. 10
3.2 Numbering plan requirements. 10
3.3 Structure of MS international PSTN/ISDN number (MSISDN). 10
3.4 Mobile Station Roaming Number (MSRN) for PSTN/ISDN routeing. 11
3.5 Structure of Mobile Station International Data Number. 11
3.6 Handover Number . 11
4 Identification of location areas and base stations .11
4.1 Composition of the Location Area Identification (LAI) . 11
4.2 Base station identification.12
4.2.1 Cell Identity (CI) and Cell Global Identification (CGI). 12
4.2.2 Base Station Identify Code (BSIC). 12
4.3 Regional Subscription Zone Identity (RSZI) . 13
4.4 Location Number . 13
5 Identification of MSCs and location registers. 14
5.1 Identification for routing purpose . 14
5.2 Identification of HLR for HLR restoration application . 14
6 International Mobile Station Equipment Identity and Software Version Number . 14
6.1 General. 14
6.2 Composition of IMEI and IMEISV. 14
6.2.1 Composition of IMEI. 14
6.2.2 Composition of IMEISV. 15
6.3 Allocation principles. 15
7 Identification of Voice Group Call and Voice Broadcast Call Entities . 15
7.1 Group Identities . 15
7.2 Group Call Area Identification. 16
7.3 Voice Group Call and Voice Broadcast Call References . 16
8 SCCP subsystem numbers. 17
8.1 Globally standardised subsystem numbers used for GSM . 17
8.2 National network subsystem numbers used for GSM . 17
Annex A (informative): Colour Codes . 18
A.1 Utilization of the BSIC . 18
A.2 Guidance for planning. 18

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A.3 Example of PLMN Colour Codes (NCCs) for the European region .19
Annex B (informative): Change history .20
History.21

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS defines the plans and principles of numbering, addressing and identification within the digital
cellular telecommunications system (Phase 2+).
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
y the third digit is incremented when editorial only changes have been incorporated in the
specification;
x the second digit is incremented for all other types of changes, i.e. technical enhancements,
corrections, updates, etc.
Transposition dates
Date of adoption of this ETS: 23 October 1998
Date of latest announcement of this ETS (doa): 31 January 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1999
Date of withdrawal of any conflicting National Standard (dow): 31 July 1999

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1 Scope
This European Telecommunications Standard (ETS) defines:
a) an identification plan for mobile subscribers in the GSM system;
b) principles of assigning telephone and ISDN numbers to MSs in the country of registration of the MS;
c) principles of assigning Mobile Station (MS) roaming numbers to visiting MSs;
d) an identification plan for location areas and base stations in the GSM system;
e) an identification plan for MSCs and location registers in the GSM system;
f) principles of assigning international mobile equipment identities;
g) principles of assigning zones for regional subscription;
h) an identification plan for groups of subscribers to the Voice Group Call Service (VGCS) and to the
Voice Broadcast Service (VBS); and identification plan for voice group calls and voice broadcast
calls; an identification plan for group call areas.
1.1 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 03.08: "Digital cellular telecommunications system (Phase 2+);
Organization of subscriber data".
[3] GSM 03.20 (ETS 300 929): "Digital cellular telecommunications system;
Security related network functions".
[4] GSM 03.70: "Digital cellular telecommunications system; Routeing of calls
to/from Public Data Networks (PDN)".
[5] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[6] GSM 09.03: "Digital cellular telecommunications system; Signalling
requirements on interworking between the Integrated Services Digital Network
(ISDN) or Public Switched Telephone Network (PSTN) and the Public Land
Mobile Network (PLMN)".
[7] GSM 11.11 (ETS 300 977): "Digital cellular telecommunications system
(Phase 2+); Specification of the Subscriber Identity Module - Mobile Equipment
(SIM - ME) interface".
[8] CCITT Recommendation E.164: "Numbering plan for the ISDN era".
[9] CCITT Recommendation E.212: "Identification plan for land MSs".
[10] CCITT Recommendation E.213: "Telephone and ISDN numbering plan for land
MSs in public land mobile networks (PLMN)".

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[11] CCITT Recommendation X.121: "International numbering plan for public data
networks".
1.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.
1.3 General comments to references
The identification plan for mobile subscribers defined below is that defined in CCITT
Recommendation E.212.
The ISDN numbering plan for MSs and the allocation of mobile station roaming numbers is that defined in
CCITT Recommendation E.213. Only one of the principles for allocating ISDN numbers is proposed for
GSM PLMNs. Only the method for allocating MS roaming numbers contained in the main text of CCITT
Recommendation E.213 is recommended for use in GSM PLMNs. If there is any difference between this
Technical Specification and the CCITT Recommendations, the former shall prevail.
For terminology, see also CCITT Recommendations E.164 and X.121.
1.4 Conventions on bitordering
The following conventions hold for the coding of the different identities appearing in this Technical
Specification and in other GSM Technical Specifications if not indicated otherwise:
- the different parts of an identity are shown in the figures in order of significance;
- the most significant part of an identity is on the left part of the figure and the least significant on the
right.
When an identity appears in other Technical Specifications, the following conventions hold if not indicated
otherwise:
- digits are numbered by order of significance, with digit 1 being the most significant;
- bits are numbered by order of significance, with the lowest bit number corresponding to the least
significant bit.
2 Identification of mobile subscribers
2.1 General
A unique International Mobile Subscriber Identity (IMSI) shall be allocated to each mobile subscriber in the
GSM system.
NOTE: This IMSI is the concept referred to by CCITT as "International Mobile Station Identity".
In order to support the subscriber identity confidentiality service the VLRs may allocate a unique
Temporary Mobile Subscriber Identity (TMSI) to visiting mobile subscribers. The VLR must be capable of
correlating the IMSI of an MS and the current TMSI for that MS.
In order to speed up the search for subscriber data in the VLR a supplementary Local Mobile Station
Identity (LMSI) is defined.
The LMSI may be allocated by the VLR at location updating and is sent to the HLR together with the IMSI.
The HLR makes no use of it but includes it together with the IMSI in all messages sent to the VLR
concerning that MS.
2.2 Composition of IMSI
IMSI is composed as shown in figure 1.

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Not m ore than 15 digits
3 digits
2 digits
MCC
MNC MSIN
NM SI
IM S I
Figure 1: Structure of IMSI
IMSI is composed of three parts:
i) Mobile Country Code (MCC) consisting of three digits. The MCC identifies uniquely the country of
domicile of the mobile subscriber;
ii) Mobile Network Code (MNC) consisting of two digits for GSM applications. The MNC identifies the
home GSM PLMN of the mobile subscriber;
iii) Mobile Subscriber Identification Number (MSIN) identifying the mobile subscriber within a GSM
PLMN.
The National Mobile Subscriber Identity (NMSI) consists of the Mobile Network Code and the Mobile
Subscriber Identification Number.
2.3 Allocation principles
IMSI shall consist of numerical characters (O through 9) only.
The overall number of digits in IMSI shall not exceed 15 digits.
The allocation of Mobile Country Codes (MCCs) is administered by the CCITT and is given in annex A to
CCITT Blue Book Recommendation E.212.
The allocation of National Mobile Subscriber Identity (NMSI) is the responsibility of each administration.
If more than one GSM PLMN exist in a country, a unique Mobile Network Code should be assigned to
each of them.
The allocation of IMSIs should be such that not more than the digits MCC + MNC of the IMSI have to be
analysed in a foreign GSM PLMN for information transfer.
2.4 Structure of TMSI
Since the TMSI has only local significance (i.e. within the VLR and the area controlled by the VLR), the
structure and coding of it can be chosen by agreement between operator and manufacturer in order to
meet local needs.
The TMSI consists of 4 octets. It can be coded using a full hexadecimal representation.
In order to avoid double allocation of TMSIs after a restart of a VLR, some part of the TMSI may be
related to the time when it was allocated or contain a bit field which is changed when the VLR has
recovered from the restart.
The TMSI shall only be allocated in ciphered form. See also GSM 03.20.
The network shall not allocate a TMSI with all 32 bits equal to 1 (this is because the TMSI must be stored
in the SIM, and the SIM uses 4 octets with all bits equal to 1 for indicating that no valid TMSI is available.

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2.5 Structure of LMSI
The LMSI consists of 4 octets and may be allocated by the VLR.
3 Numbering plan for mobile stations
3.1 General
Below the structure of the numbers used by a subscriber of a fixed (or mobile) network for calling a MS of
a GSM PLMN is defined.
Also the structure of MS roaming numbers is defined.
One or more numbers of the ISDN numbering plan shall be assigned to a MS to be used for all calls to
that station.
There may be a need for Mobile Stations (MS) to have a X.121 number. Because the MS has to have in
any case a number from the ISDN numbering plan, the X.121 number will be in addition. Implications on
numbering interworking functions which may need to be provided by the PLMN (if the use of X.121
numbers is required) are indicated in GSM 03.70.
NOTE: For card operated stations the ISDN number should be assigned to the holder of the
card (personal number).
3.2 Numbering plan requirements
In principle, it should be possible for any subscriber of the ISDN or PSTN to call any MS in a GSM PLMN.
This implies that ISDN numbers for MSs should comply with the ISDN numbering plan in each country.
The ISDN numbers of MSs should be composed in such a way that standard ISDN/PSTN charging can be
used for calls to MSs.
It should be possible for each administration to develop its own independent numbering plan for MSs.
The numbering plan should not limit the possibility for MSs to roam among GSM PLMNs.
It should be possible to change the IMSI without changing the ISDN number allocated to a MS and vice
versa.
In principle, it should be possible for any subscriber of the CSPDN/PSPDN to call any MS in a GSM
PLMN. This implies that it may be necessary for an MS to have a X.121 number.
3.3 Structure of MS international PSTN/ISDN number (MSISDN)
The MS international ISDN numbers are allocated from the CCITT Recommendation E.164 numbering
plan, see also CCITT Recommendation E.213. The MS international ISDN number will then be as shown
in figure 2.
CC NDC
SN
National (significant)
m obile num ber
M obile station international
ISDN num ber
Figure 2: Number Structure of MSISDN

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The number consists of:
- Country Code (CC) of the country in which the MS is registered, followed by
- National (significant) mobile number which consists of National Destination Code (NDC) and
Subscriber Number (SN).
For GSM applications, a National Destination Code is allocated to each GSM PLMN. In some countries
more than one NDC may be required for each GSM PLMN.
The composition of the MS international ISDN number should be such that it can be used as a global title
address in the Signalling Connection Control Part (SCCP) for routing messages to the home location
register of the MS. The country code (CC
...