SIST EN 300 927 V5.3.1:2003

• Abstract:

  SUBJECT Definition of CAP SSN replaced by a reference to GSM 03.03 Upgrade to Edition 4

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 927 V5.3.1 (2000-11) - Digital cellular telecommunications system (Phase 2+) (GSM); Numbering, addressing and identification (GSM 03.03 version 5.3.1 Release 1996)

SIST EN 300 927 V5.3.1:2003 is the Slovenian adoption of ETSI EN 300 927 V5.3.1 for the Digital cellular telecommunications system (Phase 2+) (GSM). It specifies the numbering, addressing and identification rules used in GSM networks for subscribers, mobile stations, location and base-station identities, equipment identities, group call entities and SCCP subsystem numbers. Network planners, switch engineers, and equipment and SIM manufacturers use it to assign identifiers and route signalling consistently across GSM Public Land Mobile Networks (PLMNs).

What does SIST EN 300 927 V5.3.1:2003 specify?

SIST EN 300 927 V5.3.1:2003 defines the identity and numbering plan for the GSM system. In practice, it tells operators how to build and allocate the core identifiers used for mobility management, call routing and equipment recognition.

The document is organized into:

• clause 1 - references, abbreviations, general comments and bit-ordering conventions
• clause 2 - identification of mobile subscribers
• clause 3 - numbering plan for mobile stations
• clause 4 - identification of location areas and base stations
• clause 5 - identification of MSCs and location registers
• clause 6 - International Mobile Station Equipment Identity and Software Version Number
• clause 7 - Voice Group Call Service and Voice Broadcast Service identities
• clause 8 - SCCP subsystem numbers
• annex A - colour codes
• annex B - change history

Annex	What it covers
Annex A	BSIC utilisation, planning guidance, and an example of PLMN colour codes for the European region
Annex B	Change history

What are the key requirements of SIST EN 300 927 V5.3.1:2003?

Subscriber and station identities

Clause 2 requires a unique International Mobile Subscriber Identity (IMSI) for each mobile subscriber. The IMSI is made from the Mobile Country Code (MCC), Mobile Network Code (MNC) and Mobile Subscriber Identification Number (MSIN), and it uses decimal digits only, with a maximum length of 15 digits. For operators, this is the basic identity used to register and trace a subscriber across the network.

Clause 2 also allows a Temporary Mobile Subscriber Identity (TMSI) for visiting subscribers and a Local Mobile Station Identity (LMSI) to speed up subscriber-data handling. The TMSI is local to the Visitor Location Register (VLR) area and is only allocated in ciphered form, which supports subscriber confidentiality. The LMSI is also local and helps the VLR and Home Location Register (HLR) work faster with less signalling.

Numbering and routing for mobile stations

Clause 3 defines how mobile stations are numbered for PSTN/ISDN calling. The Mobile Station International ISDN Number (MSISDN) follows the E.164 numbering structure, so ordinary telephony routing can reach a GSM subscriber. The text also allows Mobile Station Roaming Numbers (MSRN) for temporary routing through the visited network, and these numbers are not for subscriber dialling.

Clause 3 also covers the Mobile Station International Data Number and the handover number. These numbers support data access and inter-MSC handover, so the network can move an ongoing call or route data traffic without changing the subscriber identity used by the user.

Location, base-station and equipment identities

Clause 4 defines the Location Area Identification (LAI) and Cell Global Identification (CGI). The LAI combines MCC, MNC and Location Area Code (LAC), while the CGI adds Cell Identity (CI) to identify a specific cell. This is what lets the network track where a mobile is registered and where a cell-specific event occurs.

Clause 4 also defines the Base Station Identity Code (BSIC) and gives planning guidance in annex A. The BSIC helps a mobile distinguish neighbouring base stations, especially where cells use the same BCCH frequency, so careful BSIC planning reduces ambiguity and handover problems. Clause 4 further defines the Regional Subscription Zone Identity (RSZI) and the Location number used for fixed numbering of a place within a GSM PLMN.

Clause 5 identifies MSCs and location registers by international PSTN/ISDN numbers and/or signalling point codes. Clause 6 defines the International Mobile Station Equipment Identity (IMEI) and the International Mobile Station Equipment Identity and Software Version Number (IMEISV), which identify the equipment itself. The allocation rules separate manufacturer coding from sequential serial numbering and keep the software version as the part that may change after production.

Group call and SCCP numbering

Clause 7 defines GroupID, GroupCallAreaID and the VoiceGroupCallReference or VoiceBroadcastCallReference. These identities support Voice Group Call Service (VGCS) and Voice Broadcast Service (VBS), including roaming cases, so operators can address groups and call areas consistently.

Clause 8 assigns SCCP subsystem numbers for GSM use. It distinguishes globally standardised subsystem numbers from national network numbers and includes CAP migration rules, so signalling applications such as HLR, VLR, MSC, EIR, CAP and gsmSCF can interwork without numbering clashes.

What terms does SIST EN 300 927 V5.3.1:2003 define?

• IMSI - The International Mobile Subscriber Identity uniquely identifies each mobile subscriber in the GSM system.
• TMSI - The Temporary Mobile Subscriber Identity is a local, temporary identity used by the VLR to protect subscriber confidentiality.
• LMSI - The Local Mobile Station Identity is a local helper identity used to speed subscriber-data handling in the VLR.
• MSISDN - The Mobile Station International ISDN Number is the number used to call a mobile station from ISDN or PSTN networks.
• MSRN - The Mobile Station Roaming Number is a temporary routing number used to deliver a call to a roaming mobile station.
• LAI - The Location Area Identification identifies the location area in which the mobile is registered.
• IMEI / IMEISV - These identify the mobile equipment itself, with IMEISV adding the software version number.

Who uses SIST EN 300 927 V5.3.1:2003?

SIST EN 300 927 V5.3.1:2003 is used by GSM network operators, core-network engineers, and radio-planning teams when they assign subscriber identities, location codes and routing numbers. It is also relevant to manufacturers of mobile equipment and SIM-related systems, because it defines how IMEI, IMEISV, IMSI and related identities are structured.

Quality, operations and interworking teams use it to keep numbering consistent across HLR, VLR, MSC and signalling systems. It also supports planning for VGCS and VBS services, and for SCCP-based applications such as CAP.

What changed in SIST EN 300 927 V5.3.1:2003 from the previous edition?

The change history records an update to version 5.3.1 for publication. It also records earlier changes for SSN reallocation for CAP and gsmSCF, a correction of the VGC/VBC reference, and a clause 6.2 modification to enhance IMEI security.

The scope note also states that the definition of CAP SSN was replaced by a reference to GSM 03.03 Upgrade to Edition 4.

Which standards are used with SIST EN 300 927 V5.3.1:2003?

Reference	What it contributes
GSM01.04	Abbreviations and acronyms used in the document
GSM03.08	Organization of subscriber data, including RSZI and related subscriber information
GSM03.20	Security-related network functions, including TMSI handling
GSM03.70	Routing of calls to and from Public Data Networks (PDN)
GSM04.08	Mobile radio interface layer 3 specification, including identity handling on the radio side
GSM09.03	Signalling requirements between ISDN/PSTN and the PLMN
GSM11.11	SIM-ME interface, relevant to identities stored in the SIM
E.164	ISDN numbering plan used for MSISDN and other numbering structures
E.212	Identification plan for land mobile subscribers, basis for IMSI
E.213	Telephone and ISDN numbering plan for land mobile subscribers in PLMNs
X.121	International numbering plan for public data networks

The body also points to GSM02.16, GSM09.02, GSM03.68 and GSM03.69 for IMEI security, RSZI transfer and VGCS/VBS routing details.

What does the SIST EN 300 927 V5.3.1:2003 document contain?

SIST EN 300 927 V5.3.1:2003 contains identifier structures shown with figures for IMSI, TMSI, LAI, CGI, BSIC, RSZI, IMEI, IMEISV and the VoiceGroupCallReference/VoiceBroadcastCallReference. It also gives the allocation principles for the main numbering elements and the routing role of MSISDN, MSRN and handover numbers.

For planning work, the document provides the BSIC colour-code guidance in annex A, including how NCC is used to reduce ambiguity between neighbouring cells. For administration work, it gives the structure of subscriber, network and equipment identifiers that operators and manufacturers need to register, route and manage GSM services.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Numbering, addressing and identification (GSM 03.03 version 5.3.1 Release 1996)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 927 Version 5.3.1SIST EN 300 927 V5.3.1:2003en01-december-2003SIST EN 300 927 V5.3.1:2003SLOVENSKI
STANDARD
ETSIEN300927V5.3.1(2000-11)EuropeanStandard(Telecommunicationsseries)Digitalcellulartelecommunicationssystem(Phase2+);Numbering,addressingandidentification(GSM03.03version5.3.1Release1996)GLOBALSYSTEMFORMOBILECOMMUNICATIONSRSIST EN 300 927 V5.3.1:2003

ETSI(GSM03.03version5.3.1Release1996)2ETSIEN300927V5.3.1(2000-11)ReferenceREN/TSGN-000303QR3KeywordsDigitalcellulartelecommunicationssystem,GlobalSystemforMobilecommunications(GSM)ETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 927 V5.3.1:2003

ETSIETSIEN300927V5.3.1(2000-11)3(GSM03.03version5.3.1Release1996)ContentsIntellectualPropertyRights.5Foreword.51Scope.61.1References.61.2Abbreviations.71.3Generalcommentstoreferences.71.4Conventionsonbitordering.72Identificationofmobilesubscribers.72.1General.72.2CompositionofIMSI.82.3Allocationprinciples.82.4StructureofTMSI.82.5StructureofLMSI.93Numberingplanformobilestations.93.1General.93.2Numberingplanrequirements.93.3StructureofMSinternationalPSTN/ISDNnumber(MSISDN).93.4MobileStationRoamingNumber(MSRN)forPSTN/ISDNrouteing.103.5StructureofMobileStationInternationalDataNumber.113.6HandoverNumber.114Identificationoflocationareasandbasestations.114.1CompositionoftheLocationAreaIdentification(LAI).114.2Basestationidentification.114.2.1CellIdentity(CI)andCellGlobalIdentification(CGI).114.2.2BaseStationIdentifyCode(BSIC).124.3RegionalSubscriptionZoneIdentity(RSZI).124.4LocationNumber.135IdentificationofMSCsandlocationregisters.135.1Identificationforroutingpurpose.135.2IdentificationofHLRforHLRrestorationapplication.136InternationalMobileStationEquipmentIdentityandSoftwareVersionNumber.136.1General.136.2CompositionofIMEIandIMEISV.146.2.1CompositionofIMEI.146.2.2CompositionofIMEISV.146.3Allocationprinciples.157IdentificationofVoiceGroupCallandVoiceBroadcastCallEntities.157.1GroupIdentities.157.2GroupCallAreaIdentification.157.3VoiceGroupCallandVoiceBroadcastCallReferences.158SCCPsubsystemnumbers.168.1GloballystandardisedsubsystemnumbersusedforGSM.168.2NationalnetworksubsystemnumbersusedforGSM.168.3NationalnetworksubsystemnumbersusedforCAP.16SIST EN 300 927 V5.3.1:2003

ETSI(GSM03.03version5.3.1Release1996)4ETSIEN300927V5.3.1(2000-11)AnnexA(informative):ColourCodes.18A.1UtilizationoftheBSIC.18A.2Guidanceforplanning.18A.3ExampleofPLMNColourCodes(NCCs)fortheEuropeanregion.19AnnexB(informative):Changehistory.20History.21SIST EN 300 927 V5.3.1:2003

ETSIETSIEN300927V5.3.1(2000-11)5(GSM03.03version5.3.1Release1996)IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSpecialMobileGroup(SMG).Thepresentdocumentdefinestheplansandprinciplesofnumbering,addressingandidentificationwithinthedigitalcellulartelecommunicationssystem(Phase2+).ThecontentsofthepresentdocumentmaybesubjecttocontinuingworkwithinSMGandmaychangefollowingformalSMGapproval.ShouldSMGmodifythecontentsofthepresentdocumentitwillthenbere-submittedforformalapprovalproceduresbyETSIwithanidentifyingchangeofreleasedateandanincreaseinversionnumberasfollows:Version5.x.ywhere:5GSMPhase2+Release1996.xtheseconddigitisincrementedforchangesofsubstance,i.e.technicalenhancements,corrections,updates,etc.;ythethirddigitisincrementedwheneditorialonlychangeshavebeenincorporatedinthespecification.NationaltranspositiondatesDateofadoptionofthisEN:3November2000DateoflatestannouncementofthisEN(doa):28February2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2001DateofwithdrawalofanyconflictingNationalStandard(dow):31August2001SIST EN 300 927 V5.3.1:2003

ETSI(GSM03.03version5.3.1Release1996)6ETSIEN300927V5.3.1(2000-11)1ScopeThepresentdocumentdefines:a)anidentificationplanformobilesubscribersintheGSMsystem;b)principlesofassigningtelephoneandISDNnumberstoMSsinthecountryofregistrationoftheMS;c)principlesofassigningMobileStation(MS)roamingnumberstovisitingMSs;d)anidentificationplanforlocationareasandbasestationsintheGSMsystem;e)anidentificationplanforMSCsandlocationregistersintheGSMsystem;f)principlesofassigninginternationalmobileequipmentidentities;g)principlesofassigningzonesforregionalsubscription;h)anidentificationplanforgroupsofsubscriberstotheVoiceGroupCallService(VGCS)andtotheVoiceBroadcastService(VBS);andidentificationplanforvoicegroupcallsandvoicebroadcastcalls;anidentificationplanforgroupcallareas.1.1ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.• ForthisRelease1996document,referencestoGSMdocumentsareforRelease1996versions(version5.x.y).[1]GSM01.04(ETR350):"Digitalcellulartelecommunicationssystem(Phase2+);Abbreviationsandacronyms".[2]GSM03.08:"Digitalcellulartelecommunicationssystem(Phase2+);Organizationofsubscriberdata".[3]GSM03.20(ETS300929):"Digitalcellulartelecommunicationssystem(Phase2+);Securityrelatednetworkfunctions".[4]GSM03.70:"Digitalcellulartelecommunicationssystem(Phase2+);Routeingofcallsto/fromPublicDataNetworks(PDN)".[5]GSM04.08(ETS300940):"Digitalcellulartelecommunicationssystem(Phase2+);Mobileradiointerfacelayer3specification".[6]GSM09.03:"Digitalcellulartelecommunicationssystem(Phase2+);SignallingrequirementsoninterworkingbetweentheIntegratedServicesDigitalNetwork(ISDN)orPublicSwitchedTelephoneNetwork(PSTN)andthePublicLandMobileNetwork(PLMN)".[7]GSM11.11(ETS300977):"Digitalcellulartelecommunicationssystem(Phase2+);SpecificationoftheSubscriberIdentityModule-MobileEquipment(SIM-ME)interface".[8]CCITTRecommendationE.164:"NumberingplanfortheISDNera".SIST EN 300 927 V5.3.1:2003

ETSIETSIEN300927V5.3.1(2000-11)7(GSM03.03version5.3.1Release1996)[9]CCITTRecommendationE.212:"IdentificationplanforlandMSs".[10]CCITTRecommendationE.213:"TelephoneandISDNnumberingplanforlandMSsinpubliclandmobilenetworks(PLMN)".[11]CCITTRecommendationX.121:"Internationalnumberingplanforpublicdatanetworks".1.2AbbreviationsAbbreviationsusedinthepresentdocumentarelistedinGSM01.04.1.3GeneralcommentstoreferencesTheidentificationplanformobilesubscribersdefinedbelowisthatdefinedinCCITTRecommendationE.212.TheISDNnumberingplanforMSsandtheallocationofmobilestationroamingnumbersisthatdefinedinCCITTRecommendationE.213.OnlyoneoftheprinciplesforallocatingISDNnumbersisproposedforGSMPLMNs.OnlythemethodforallocatingMSroamingnumberscontainedinthemaintextofCCITTRecommendationE.213isrecommendedforuseinGSMPLMNs.IfthereisanydifferencebetweenthisTechnicalSpecificationandtheCCITTRecommendations,theformershallprevail.Forterminology,seealsoCCITTRecommendationsE.164andX.121.1.4ConventionsonbitorderingThefollowingconventionsholdforthecodingofthedifferentidentitiesappearinginthisTechnicalSpecificationandinotherGSMTechnicalSpecificationsifnotindicatedotherwise:-thedifferentpartsofanidentityareshowninthefiguresinorderofsignificance;-themostsignificantpartofanidentityisontheleftpartofthefigureandtheleastsignificantontheright.WhenanidentityappearsinotherTechnicalSpecifications,thefollowingconventionsholdifnotindicatedotherwise:-digitsarenumberedbyorderofsignificance,withdigit1beingthemostsignificant;-bitsarenumberedbyorderofsignificance,withthelowestbitnumbercorrespondingtotheleastsignificantbit.2Identificationofmobilesubscribers2.1GeneralAuniqueInternationalMobileSubscriberIdentity(IMSI)shallbeallocatedtoeachmobilesubscriberintheGSMsystem.NOTE:ThisIMSIistheconceptreferredtobyCCITTas"InternationalMobileStationIdentity".InordertosupportthesubscriberidentityconfidentialityservicetheVLRsmayallocateauniqueTemporaryMobileSubscriberIdentity(TMSI)tovisitingmobilesubscribers.TheVLRmustbecapableofcorrelatingtheIMSIofanMSandthecurrentTMSIforthatMS.InordertospeedupthesearchforsubscriberdataintheVLRasupplementaryLocalMobileStationIdentity(LMSI)isdefined.TheLMSImaybeallocatedbytheVLRatlocationupdatingandissenttotheHLRtogetherwiththeIMSI.TheHLRmakesnouseofitbutincludesittogetherwiththeIMSIinallmessagessenttotheVLRconcerningthatMS.SIST EN 300 927 V5.3.1:2003

ETSI(GSM03.03version5.3.1Release1996)8ETSIEN300927V5.3.1(2000-11)2.2CompositionofIMSIIMSIiscomposedasshowninfigure1.MCCNotmorethan15digits3digits2digitsMNCMSINNMSIIMSIFigure1:StructureofIMSIIMSIiscomposedofthreeparts:i)MobileCountryCode(MCC)consistingofthreedigits.TheMCCidentifiesuniquelythecountryofdomicileofthemobilesubscriber;ii)MobileNetworkCode(MNC)consistingoftwodigitsforGSMapplications.TheMNCidentifiesthehomeGSMPLMNofthemobilesubscriber;iii)MobileSubscriberIdentificationNumber(MSIN)identifyingthemobilesubscriberwithinaGSMPLMN.TheNationalMobileSubscriberIdentity(NMSI)consistsoftheMobileNetworkCodeandtheMobileSubscriberIdentificationNumber.2.3AllocationprinciplesIMSIshallconsistofnumericalcharacters(Othrough9)only.TheoverallnumberofdigitsinIMSIshallnotexceed15digits.TheallocationofMobileCountryCodes(MCCs)isadministeredbytheCCITTandisgiveninannexAtoCCITTBlueBookRecommendationE.212.TheallocationofNationalMobileSubscriberIdentity(NMSI)istheresponsibilityofeachadministration.IfmorethanoneGSMPLMNexistinacountry,auniqueMobileNetworkCodeshouldbeassignedtoeachofthem.TheallocationofIMSIsshouldbesuchthatnotmorethanthedigitsMCC+MNCoftheIMSIhavetobeanalysedinaforeignGSMPLMNforinformationtransfer.2.4StructureofTMSISincetheTMSIhasonlylocalsignificance(i.e.withintheVLRandtheareacontrolledbytheVLR),thestructureandcodingofitcanbechosenbyagreementbetweenoperatorandmanufacturerinordertomeetlocalneeds.TheTMSIconsistsof4octets.Itcanbecodedusingafullhexadecimalrepresentation.InordertoavoiddoubleallocationofTMSIsafterarestartofaVLR,somepartoftheTMSImayberelatedtothetimewhenitwasallocatedorcontainabitfieldwhichischangedwhentheVLRhasrecoveredfromtherestart.TheTMSIshallonlybeallocatedincipheredform.SeealsoGSM03.20.ThenetworkshallnotallocateaTMSIwithall32bitsequalto1(thisisbecausetheTMSImustbestoredintheSIM,andtheSIMuses4octetswithallbitsequalto1forindicatingthatnovalidTMSIisavailable.SIST EN 300 927 V5.3.1:2003

ETSIETSIEN300927V5.3.1(2000-11)9(GSM03.03version5.3.1Release1996)2.5StructureofLMSITheLMSIconsistsof4octetsandmaybeallocatedbytheVLR.3Numberingplanformobilestations3.1GeneralBelowthestructureofthenumbersusedbyasubscriberofafixed(ormobile)networkforcallingaMSofaGSMPLMNisdefined.AlsothestructureofMSroamingnumbersisdefined.OneormorenumbersoftheISDNnumberingplanshallbeassignedtoaMStobeusedforallcallstothatstation.TheremaybeaneedforMobileStations(MS)tohaveaX.121number.BecausetheMShastohaveinanycaseanumberfromtheISDNnumberingplan,theX.121numberwillbeinaddition.ImplicationsonnumberinginterworkingfunctionswhichmayneedtobeprovidedbythePLMN(iftheuseofX.121numbersisrequired)areindicatedinGSM03.70.NOTE:ForcardoperatedstationstheISDNnumbershouldbeassignedtotheholderofthecard(personalnumber).3.2NumberingplanrequirementsInprinciple,itshouldbepossibleforanysubscriberoftheISDNorPSTNtocallanyMSinaGSMPLMN.ThisimpliesthatISDNnumbersforMSsshouldcomplywiththeISDNnumberingplanineachcountry.TheISDNnumbersofMSsshouldbecomposedinsuchawaythatstandardISDN/PSTNchargingcanbeusedforcallstoMSs.ItshouldbepossibleforeachadministrationtodevelopitsownindependentnumberingplanforMSs.ThenumberingplanshouldnotlimitthepossibilityforMSstoroamamongGSMPLMNs.ItshouldbepossibletochangetheIMSIwithoutchangingtheISDNnumberallocatedtoaMSandviceversa.Inprinciple,itshouldbepossibleforanysubscriberoftheCSPDN/PSPDNtocallanyMSinaGSMPLMN.ThisimpliesthatitmaybenecessaryforanMStohaveaX.121number.3.3StructureofMSinternationalPSTN/ISDNnumber(MSISDN)TheMSinternationalISDNnumbersareallocatedfromtheCCITTRecommendationE.164numberingplan,seealsoCCITTRecommendationE.213.TheMSinternationalISDNnumberwillthenbeasshowninfigure2.SIST EN 300 927 V5.3.1:2003

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