SIST ETS 300 392-10-4 E2:2003

• Abstract:

  Analysis of predicted needs for digital trunked systems in Europe; definition of services to be provided; analysis of spectrum req ments; characteristics of relevant interfaces Contains: TETRA 03.60 to 03.85

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• 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
• Mandate: T-172-1A
• Ref Project: ETSI ETS 300 392-10-4 ed.2 (2000-02) - Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 4: Call Forwarding (CF)

Overview

SIST ETS 300 392-10-4 E2:2003 defines the supplementary Call Forwarding (CF) services for Terrestrial Trunked Radio (TETRA) systems, a leading digital trunked radio standard widely deployed for mission-critical communication in Europe. Managed by the Slovenski inštitut za standardizacijo (SIST) and developed in alignment with European Telecommunications Standards Institute (ETSI) methodology, this standard details stage 1 service descriptions for Call Forwarding in TETRA Voice plus Data (V+D) networks.

The document addresses the practical and predicted needs for digital trunked systems across Europe, focusing on both voice and data services. It covers the essential call handling features that support guaranteed communication continuity through the definition, provision, and operation of various Call Forwarding types, ensuring availability and efficiency for professional users.

Key Topics

• Types of Call Forwarding:
  • Call Forwarding Unconditional (CFU)
  • Call Forwarding on Busy (CFB)
  • Call Forwarding on No Reply (CFNRy)
  • Call Forwarding on Not Reachable (CFNRc)
• Forwarding Counter (FC):
  • Mechanism to limit the number of call forwards and prevent network loops
• Service Activation and Deactivation:
  • Procedures for authorized users to manage forwarding features
• Interaction with Other Supplementary Services:
  • Handling of Call Waiting, Call Hold, Priority Calls, and more
• Applicability:
  • Compatibility with TETRA circuit mode services (speech/data) and Short Data Service (SDS)
• User Roles and Authorization:
  • Differentiation of served users, authorized users, affected users, and forwarded-to users
• Network and User Notifications:
  • Informing users and network entities about call forwarding status and actions

Applications

Call Forwarding within TETRA networks enables organizations to ensure seamless communication by redirecting incoming calls under various operational scenarios:

• Public Safety and Emergency Services: Guaranteeing message delivery when a user is busy, unable to answer, or outside coverage, maintaining mission-critical continuity.
• Transport and Utilities: Centralizing communications to reduce missed calls and improve operational efficiency, especially for mobile teams or distributed workforce.
• Industrial and Enterprise Use: Ensuring important calls reach backup personnel or alternative numbers during maintenance or shift changes.
• Group Communication: Defining how forwarding behaves in individual vs. group call scenarios, a vital feature in workforce coordination.
• Network Performance and Security: Using the Forwarding Counter to safeguard against excessive call forwarding that could degrade system performance or security.

By standardizing these supplementary services, TETRA networks provide robust and flexible communication options tailored to the complex requirements of professional mobile radio (PMR) environments.

Related Standards

The following standards are closely connected with SIST ETS 300 392-10-4 E2:2003 and provide additional guidance or references for TETRA implementations:

• SIST ETS 300 392-2: TETRA Air Interface specifications
• ETS 300 392-10: TETRA Supplementary Services (general stage 1 description)
• ECMA-173: Private Integrated Services Network Call Diversion
• ITU-T Recommendation I.210: Principles for telecommunication services in ISDN
• ITU-T Recommendation Z.100: Specification and Description Language (SDL)
• ETSI EN 300 392 Series: Comprehensive TETRA system and interface requirements

For full deployment, compliance with these related standards ensures interoperability and alignment with European digital trunked radio regulations and best practices.

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Keywords: TETRA standard, call forwarding TETRA, supplementary services, digital trunked radio, mission-critical communications, public safety radio, SIST, ETSI standards, professional mobile radio, network services.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radijska oprema in sistemi (RES) - Vseevropski prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 10. del: Dopolnilne storitve stopnje 1- 10-04. del: Izsmeritev klicaTerrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 4: Call Forwarding (CF)33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:ETS 300 392-10-4 Edition 2SIST ETS 300 392-10-4 E2:2003en01-december-2003SIST ETS 300 392-10-4 E2:2003SLOVENSKI
STANDARD
EUROPEANETS300392-10-4TELECOMMUNICATIONFebruary2000STANDARDSecondEditionSource:TETRAReference:RE/TETRA-03001-10-04ICS:33.020Keywords:CF,data,radio,speech,stage1,supplementaryservice,TETRATerrestrialTrunkedRadio(TETRA);VoiceplusData(V+D);Part10:Supplementaryservicesstage1;Sub-part4:CallForwarding(CF)ETSIEuropeanTelecommunicationsStandardsInstituteETSISecretariatPostaladdress:F-06921SophiaAntipolisCEDEX-FRANCEOfficeaddress:650RoutedesLucioles-SophiaAntipolis-Valbonne-FRANCEInternet:[e-mail]-http://www.etsi.orgTel.:[phone]-Fax:[phone]CopyrightNotification:Nopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST ETS 300 392-10-4 E2:2003

Page2ETS300392-10-4:February2000Whilsteverycarehasbeentakeninthepreparationandpublicationofthisdocument,errorsincontent,typographicalorotherwise,mayoccur.Ifyouhavecommentsconcerningitsaccuracy,pleasewriteto"ETSIStandardsMakingSupportDept."attheaddressshownonthetitlepage.SIST ETS 300 392-10-4 E2:2003

Page3ETS300392-10-4:February2000ContentsForeword.71Scope.92Normativereferences.93Definitions,symbolsandabbreviations.103.1Definitions.103.2Symbols.123.3Abbreviations.123.3.1Supplementaryserviceabbreviations.124SS-CFGenericSpecification.124.1Description.134.1.1Generaldescription.134.1.2Applicability.134.2Procedures.134.2.1Provision/Withdrawal.134.2.2Normalprocedures.144.2.2.1Activation/deactivation/definition/registration/interrogation.144.2.2.1.1Activation/deactivation.144.2.2.1.2Enable/Disable.154.2.2.1.3Registration.164.2.2.1.4Interrogation.164.2.2.2Invocationandoperation.174.2.2.2.1Forwarded-touserCnotification.174.2.2.2.2CallinguserAnotification.174.2.3Exceptionalprocedures.184.2.3.1Activation/Deactivation.184.2.3.2Interrogation.184.2.3.3Invocationandoperation.194.3InteractionswithothersupplementaryservicesandANFs.194.3.1CallingLineIdentificationPresentation(SS-CLIP).194.3.2ConnectedLineIdentificationPresentation(SS-COLP).194.3.3Calling/ConnectedLineIdentificationRestriction(SS-CLIR/SS-COLR).194.3.4CallCompletiontoBusySubscriber(SS-CCBS).204.3.5CallCompletiononNoReply(SS-CCNRy).204.3.6Callreport.204.3.7Talkingpartyidentification.204.3.8Listsearchcall.204.3.9Shortnumberaddressing.204.3.10Areaselection.204.3.11Accesspriority.204.3.12Callwaiting.214.3.13Callhold.214.3.14Lateentry.214.3.15Transferofcontrol.214.3.16Prioritycall.214.3.17Pre-emptivePriorityCall.214.3.18Includecall.214.3.19Adviceofcharge.214.3.20Barringofoutgoingcalls.214.3.21Barringofincomingcalls.214.3.22Ambiancelistening.224.3.23Dynamicgroupnumberassignment.224.3.24InteractionwithANFMobility.224.4Inter-workingconsiderations.23SIST ETS 300 392-10-4 E2:2003

Page4ETS300392-10-4:February20005SS-CFoverallSDL.236SS-CFUSpecificSpecification.276.1Description.276.1.1Applicability.276.2InteractionwithothersupplementaryservicesandANFs.276.2.1CallWaitingSS-CW.276.2.2CallForwardingBusy(SS-CFB).276.2.3CallForwardingNoReply(SS-CFNRy).286.2.4CallForwardingnotReachable(SS-CFNRc).286.2.5Pre-emptivePriorityCall.286.2.6Callauthorizedbydispatcher.286.2.7Discreetlistening.287SS-CFBSpecificSpecification.287.1Description.287.1.1Generaldescription.287.1.2Applicability.287.2Procedures.297.2.1Provision/withdrawal.297.2.2Normalprocedures.297.2.2.1Activation/deactivation.297.3InteractionwithothersupplementaryservicesandANFs.297.3.1CallCompletiontoBusySubscriber(SS-CCBS).297.3.2CallCompletiononNoReply(SS-CCNR).297.3.3Pre-emptiveprioritycall.297.3.4CallForwardingUnconditional(SS-CFU).307.3.5CallForwardingNoReply(SS-CFNRy).307.3.6CallForwardingNotReachable(SS-CFNRc).307.3.7Callwaiting.307.3.8Discreetlistening.308SS-CFNRySpecificSpecification.308.1Description.318.1.1Generaldescription.318.1.2Applicability.318.2Procedures.318.2.1Provision/Withdrawal.318.2.2Normalprocedures.318.2.2.1Activation/Deactivation.318.2.2.2Invocationandoperation.318.2.3Exceptionalprocedures.318.2.3.1Activation/Deactivation.318.3InteractionwithothersupplementaryservicesandANFs.328.3.1CallCompletiontoBusySubscriber(SS-CCBS).328.3.2CallCompletiononNoReply(SS-CCNR).328.3.3CallForwardingUnconditional(SS-CFU).328.3.4CallForwardingBusy(SS-CFB).328.3.5CallForwardingNotReachable(SS-CFNRc).328.3.6Callauthorizedbydispatcher.328.3.7Callwaiting.328.3.8Pre-emptiveprioritycall.339SS-CFNRcSpecificSpecification.339.1Description.339.1.1Generaldescription.339.1.2Applicability.339.2Procedures.339.2.1Provision/withdrawal.339.2.2Normalprocedures.339.2.2.1Activation/deactivation/registration/interrogation.339.2.2.2Invocationandoperation.339.2.3Exceptionalprocedures.34SIST ETS 300 392-10-4 E2:2003

Page5ETS300392-10-4:February20009.2.3.1Activation/Deactivation.349.3InteractionswithothersupplementaryservicesandANFs.349.3.1Interactionswithothersupplementaryservices.349.3.2InteractionwithCallWaiting(SS-CW).349.3.3InteractionwithANFMobility.349.4Inter-workingconsiderations.3410SS-CFUforSDSSpecification.3410.1Description.3410.1.1Generaldescription.3410.1.2Applicability.3510.2Procedures.3510.2.1Provision/withdrawal.3510.2.2Normalprocedures.3510.2.2.1Activation/deactivation/registration/interrogation.3510.2.2.1.1Enable/Disable.3610.2.2.1.2Registration.3610.2.2.1.3Interrogation.3710.2.2.2Invocationandoperation.3710.2.3Exceptionalprocedures.3710.2.3.1Activation/Deactivation.3710.3InteractionswithothersupplementaryservicesandANFs.3710.3.1Interactionswithothersupplementaryservices.3710.3.2InteractionwithANFMobility.3710.4Inter-workingconsiderations.38AnnexA(informative):Bibliography.39History.40SIST ETS 300 392-10-4 E2:2003

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Page7ETS300392-10-4:February2000ForewordThisEuropeanTelecommunicationStandard(ETS)hasbeenproducedbytheTerrestrialTrunkedRadio(TETRA)ProjectoftheEuropeanTelecommunicationsStandardsInstitute(ETSI).ThisETSisamulti-partstandardandwillconsistofthefollowingparts:Part1:"Generalnetworkdesign";Part2:"AirInterface(AI)";Part3:"InterworkingattheInter-SystemInterface(ISI)";Part4:"Gatewaysbasicoperation";Part5:"PeripheralEquipmentInterface(PEI)";Part6:"LineconnectedStation(LS)";Part7:"Security";Part9:"Generalrequirementsforsupplementaryservices";Part10:"Supplementaryservicesstage1";Part11:"Supplementaryservicesstage2";Part12:"Supplementaryservicesstage3";Part13:"SDLmodeloftheAirInterface(AI)";Part14:"ProtocolImplementationConformanceStatement(PICS)proformaspecification".TranspositiondatesDateofadoptionofthisETS:21January2000DateoflatestannouncementofthisETS(doa):30April2000DateoflatestpublicationofnewNationalStandardorendorsementofthisETS(dop/e):31October2000DateofwithdrawalofanyconflictingNationalStandard(dow):31October2000SIST ETS 300 392-10-4 E2:2003

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Page9ETS300392-10-4:February20001ScopeThisETSspecifiesthesupplementaryservicesCallForwardingUnconditional(CFU),CallForwardingBusy(CFB),CallForwardingonNoReply(CFNRy)andCallForwardingonNotReachable(CFNRc)whichareapplicabletovariousbasicservicessupportedbyTETRASwMIs.BasicservicesarespecifiedinETS300392-2[4].SS-CFU,SS-CFB,SS-CFNRyandSS-CFNRcaresupplementaryserviceswhichapplyduringcallestablishmentprovidingaforwardingofanincomingcalltoanotherdestinationthantheoriginaldestinationdefinedbythecallinguserunderdifferentconditions(busy,noreplyornotreachable)orundernocondition(unconditional).Supplementaryservicesspecificationsareproducedinthreestages,accordingtothemethoddescribedinITU-TRecommendationI.210[2].Thepresentdocumentcontainsthestage1specificationsofSS-CFU,SS-CFB,SS-CFNRyandSS-CFNRc.Thestage1descriptionsspecifythesupplementaryservicesasseenbyusersofnetworks.ThisETSisapplicabletocircuitmodeTETRAV+Dtele-servicesandbearerservices.ThisETSisalsoapplicabletoTETRAShortDataService(SDS).ManMachineInterfacesandchargingprinciplesareoutsidethescopeofthisETS.SelectiveCallForwardingisoutsidethescopeofthisETS.NOTE1:SelectiveCallForwardingmaybeconsideredforfurtherimprovementsofTETRASS-CFatalaterstage.ThissecondeditionofthisETSwaspresentedasadeltadocumenttothefirsteditionofECMA-173[1].ThissecondeditionhasbeenredraftedbasedonthelatestpublishedtextofECMA-173[1]asaselfcontaineddocumentsoastobemorereadable.AdditionstoECMA-173[1]havebeenmadetotakeintoaccountparticularTETRAspecificssuchasgroupcallsandtoincludeuserrequirementsandsituationsnotaddressedinECMA-173[1].NOTE2:ContrarytoECMA-173[1],thisETSdoesnotspecifySS-CD(CallDeflection)whichisnotpresentlysupportedbyTETRA.NOTE3:ContrarytoECMA-173[1],thisETSdistinguishesbetweenNoReplyandNotReachablebecauseoftheradionatureoftheTETRAlinks.ThisStandardspecifiesalsotheForwardingCounter(FC),whichisapplicabletovariousbasicservicessupportedbyTETRANetworks.BasicservicesarespecifiedinETS300392-2[4].FCcountsthenumberofforwardingthatacallhasbeenforwardedandallowstolimitthenumberofforwardingthatacallrequestmayencounterduringcallestablishment,e.g.toprotectthenetworkagainstindefinitelooping.Thereisnouserinvolvedintheprovisionoroperationofforwardingcounter.2NormativereferencesThisETSincorporatesbydatedandundatedreference,provisionsfromotherpublications.Thesenormativereferencesarecitedattheappropriateplacesinthetextandthepublicationsarelistedhereafter.Fordatedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisETSonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthepublicationreferredtoapplies.[1]ECMA-173(1997):"PrivateIntegratedServicesNetwork(PISN)-Specification,FunctionalModelandInformationFlows-CallDiversionSupplementaryServices(CFSD)".[2]ITU-TRecommendationI.210(1993):"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".SIST ETS 300 392-10-4 E2:2003

Page10ETS300392-10-4:February2000[3]ITU-TRecommendationZ.100(1993):"CCITTSpecificationanddescriptionlanguage(SDL)".[4]ETS300392-2(1995):"TerrestrialEuropeanTrunkedRadio(TETRA);VoiceplusData(V+D);Part2:AirInterface(AI)".[5]CCITTRecommendationQ.9(1988):"Vocabularyofswitchingandsignallingterms".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthisETS,thefollowingtermsanddefinitionsapply:Additionalnetworkfeature:additionalnetworkfeature(ANF)isacapability,overandabovethatofabasicservice,providedbyaSwMI,butnotdirectlytoaSwMIuser.Authorizeduser:userwhoisresponsibleforthedefinition,activationanddeactivationoftheservice.Theauthorizedusermayalsointerrogatetheservice.Affecteduser:userwhoissubjecttotheoperation.Busy:TETRAdestinationisconsideredtobebusyifeithera"networkdetermineduserbusy"ora"userdetermineduserbusy"conditionexists.Call,basiccall:callorbasiccallisaninstanceoftheuseofabasicservice.Connectednumber:numberoftheuserthatanswers(UserC).Forwarded-tonumber:forwarded-tonumberisthenumbertowhichacallisforwarded.Forwarded-touser:forwarded-touseristheusertowhichacallisforwarded.Forwarding:forwardingistheredirectionofacall,onbehalfofacalleduserandpriortoconnect,toanumberdifferentfromthenumberofthatcalleduser.Forwardingcause:forwardingcausecontainsthereasonfortheforwarding:CFU,CFB,CFNRy,CFNRc.Forwardingcounter:counterforthenumberofforwardinginvolvedinacallorsignallingconnectionduringtheestablishmentphase.Forwardingnumber:forwardingnumberisthenumberoftheserveduser.Forwardinguser:userforwhichthecallforwardingisinvoked;itmaybethecalleduserfirstandthenanyofthesuccessiveforwarded-tousers(seealsolastforwardinguser).Forwardswitching:networkrouteingalgorithmwhichperformstheforwardingbyjoiningtogetherthefirstconnectionfromUserA'snodetoUserB'snodeandasecond,newconnectionfromUserB'snodetoUserC'snode.Lastforwardinguser:lastforwardinguseristheserveduserfromthepointofviewoftheforwarded-touserforaparticularstageofcallforwarding.Inthecaseofacallsubjecttoasinglestageofcallforwarding,UserBisthelastforwardinguserfromthepointofviewofUserC.Inthecaseofacallsubjecttomultiplestagesofcallforwarding,userB1isthelastforwardinguserfromthepointofviewofuserB2,userB2isthelastforwardinguserfromthepointofviewofuserB3,etc.TheserveduserforthefinalstageofcallforwardingisthelastforwardinguserfromthepointofviewofUserC.LineStation(LS):physicalgroupingthatcontainsallthefixedequipmentthatisusedtoobtainTETRAservicesthroughaline.SIST ETS 300 392-10-4 E2:2003

Page11ETS300392-10-4:February2000MobileStation(MS):physicalgroupingthatcontainsallofthemobileequipmentthatisusedtoobtainTETRAservices.Bydefinition,amobilestationcontainsatleastoneMobileRadioStack(MRS).Originalcallednumber:originalcallednumberisthenumberofUserB(incaseofmultiplecallforwardinguserB1).Originalcalleduser:originalcalleduseristhefirstserveduserofacallwhichissubjecttooneormorestagesofcallforwarding,i.e.UserBorB1.Partialre-routeing:networkrouteingalgorithmwhichperformsthecallforwardingbyreplacingaparticularpartoftheconnectionfromUserA'snodetoUserB'snodebyanotherconnectionfromUserA'snodetoUserC'snode.Signallingconnection:connectionusedtoexchangeinformationbetweenpeersupplementaryserviceprotocolcontrolentitiesindependentlyofabasiccall.Supplementaryservice:anyserviceprovidedbyanetworkinadditiontoitsbasicserviceorservices(definedinCCITTRecommendationQ.9[5]).Asupplementaryservicemodifiesorsupplementsabasictelecommunicationservice.Consequently,itcannotbeofferedtoacustomerasastandaloneservice.Itmustbeofferedtogetherwithorinassociationwithabasictelecommunicationservice(extractfromITU-TRecommendationI.210[2]).SwitchingandManagementInfrastructure(SwMI):alloftheTETRAequipmentforaVoiceplusData(V+D)networkexceptforsubscriberterminals.TheSwMIenablessubscriberterminalstocommunicatewitheachotherviatheSwMI.SwMInumber:SwMInumberisanumberbelongingtoaSwMInumberingplan.Re-routeing:networkrouteingalgorithmwhichperformsthecallforwardingbyreplacingtheconnectionfromUserA'snodetoUserB'snodebyanotherconnectionfromUserA'snodetoUserC'snode.Serveduser:serveduseristheuserofaparticularSwMInumberwhoisrequestingthatcallstohisnumberbeforwarded.Thisusermayalsobereferredtoastheforwardinguserorthecalleduser.Tele-service:typeoftelecommunicationsservicethatprovidesthecompletecapability,includingterminalequipmentfunctions,forcommunicationbetweenusersaccordingtoagreedprotocols.Serveduser:userforwhomthesupplementaryserviceisinvoked.User:entityusingtheservicesofatelecommunicationsnetworkviaanexternallyaccessibleserviceaccesspoint.Unlessotherwisenoted,theworduseristobeunderstoodasindividualorgroup.NOTE1:Ausermaybeapersonoranapplicationprocess.Userapplication:applicationprocesswhichactsasauser(seedefinitionofuserjustabove).UserA:userAisthecallinguserofacallwhichissubjecttocallforwarding.UserB:userBistheserved(forwarding)userofacallwhichissubjecttocallforwarding.UserB1,userB2,userB3,etc.:thesearetheserved(forwarding)usersofacallwhicharesubjecttomultiplestagesofforwarding.B1isthefirstserveduser,B2isthesecondserveduser,B3isthethirdserveduser,etc.NOTE2:B2isalsotheforwarded-touserwithrespecttothefirststageofcallforwarding,B3isalsotheforwarded-touserwithrespecttothesecondstageofcallforwarding,etc.UserC:userCistheforwarded-touserwithrespecttothefinalstageofcallforwarding.SIST ETS 300 392-10-4 E2:2003

Page12ETS300392-10-4:February20003.2SymbolsForthepurposesofthisETS,therearenoadditionalsymbolsexceptedthesymbolsusedintheSDLrepresentation(ITU-TRecommendationZ.100[3]).3.3AbbreviationsForthepurposesofthisETS,thefollowingabbreviationsapply:ANFAdditionalNetworkFeatureCDCallDeflectionFCForwardingCounterGTSIGroupTETRASubscriberIdentityISDNIntegratedServicesDigitalNetworkISIInterSystemInterfaceITSIIndividualTETRASubscriberIdentityLSLineStationMSMobileStationSDLSpecificationandDescriptionLanguageSDSShortDataServiceSSSupplementaryServiceNOTE:TheabbreviationSSisonlyusedwhenreferringtoaspecificsupplementaryservice.SwMISwitchingandManagementInfrastructureTETerminalEquipmentTETRATerrestrialEuropeanTrunkedRadioV+DVoicePlusData3.3.1SupplementaryserviceabbreviationsBICBarringofIncomingCallsBOCBarringofOutgoingCallsCADCallAuthorizedbyDispatcherCCBSCallCompletiontoBusySubscriber(TETRA)CCNRCallCompletiononNoReply(TETRA)CFCallForwardingCFBCallForwardingonBusyCFNRCallForwardingonNoReply(genericforbothCFNRyandCFNRc)CFNRcCallForwardingonNotReachableCFNRyCallForwardingonNoReplyCFUCallForwardingUnconditionalCLIPCallingLineIdentificationPresentationCLIRCalling/ConnectedLineIdentificationRestrictionCOLPCOnnectedLineIdentificationPresentationCOLRCOnnectedLineIdentificationRestrictionCRCallReportCWCallWaitingDLDiscreetListeningICIncludeCallPPCPre-emptivePriorityCallSNAShortNumberAddressing4SS-CFGenericSpecificationThisgenericspecificationregroupsallelementscommontothefourCallForwardingprocedures(CFU,CFB,CFNRyandCFNRc).Eachcallforwardingprocedurehasthenitsowndedicatedpart.SS-CFUforSDSisdescribedinanotherspecificpart.FCshallbeinvokedinconjunctionwithacallforwardingrequestwhenitisdesiredtolimitthenumberofforwardingthatthecallcanencounter.Themaximumnumberofforwardingthatthecallcanencounterisnetworkdependent,intherange1to31.SIST ETS 300 392-10-4 E2:2003

Page13ETS300392-10-4:February20004.1Description4.1.1GeneraldescriptionSS-CFenablesaservedusertohavethenetworkredirect,toeitheranotherITSIortoanotherGTSI,callswhichareaddressedtotheserveduser'sITSI/GTSI/ExternalNumber.SS-CFmayoperateonallcallsorjustthoseassociatedwithspecifiedbasicservices.Theserveduser'sabilitytooriginatecallsisunaffectedbySS-CF.SS-CFisprovidedonaperITSI/GTSI/ExternalNumberbasis.Themaximumnumberofforwardingforasinglecallisanetworkimplementationoption.Whencountingthenumberofforwarding,alltypesofforwardingshallbeincluded.NOTE1:Notseentotheuser,themechanismoftheForwardingCounterallowstocountthenumberofforwardingofthecallresourceandofthesignalingconnection.NOTE2:ThemechanismoftheTransitCounterisseparatebutsimilartotheForwardingCountermechanism.CallforwardingofanindividualcallmaybeeithertoanITSIortoaGTSI;individualandgroupcallsmaybeforwardedtoeitheranITSIoraGTSI(i.e.theCommunicationTypeasdefinedinETS300392-2[4]subclause14.8.2maychangeduetoforwarding).Inthecaseoftheset-upofagroupcall,theinvocationofSS-CFbyanindividualmemberofthegrouphasnoeffectonthegroupcallset-upandthegroupcallshallnotbeforwardedtoanonmemberofthegroup.NOTE3:Asaresultofcallforwarding,theoriginalTETRAcallmaybeforwardedtoanexternalnumber.4.1.2ApplicabilitySS-CFisapplicabletoallbasicTETRAV+Dcircuitmodeservicesasdefinedinsubclause11.3.4ofETS300392-2[4](speechanddata).FCisapplicabletoallbasicservicesdefinedinETS300392-2[4].4.2Procedures4.2.1Provision/WithdrawalProvisionandwithdrawalofSS-CFshallbebypre-arrangementwiththeserviceprovider.SS-CFsubscriptionshallbeonaperITSI/GTSI/ExternalNumberbasis.ForeachITSI/GTSI/ExternalNumber,thesupplementaryservicemaybesubscribedtocollectivelyforallbasicservicessubscribedtoatthatITSI/GTSI/ExternalNumberorforonlysomeofthebasicservicessubscribedtoatthatITSI/GTSI/ExternalNumber.ThesubscriptionoptionsandvaluesofferedbytheoriginatingSwMIareanimplementationmatter.Astage3standardshallsupporttheoptionsandvaluesspecifiedintable1.ASwMImayofferlessoptionsandvaluesthanthosespecifiedintable1.SubscriptionoptionsapplyseparatelytoeachbasicservicesubscribedtooneachITSI/GTSI/ExternalNumber.Foreachsubscriptionoptiononlyonevalueistobeselected.DifferentsubscriptionoptionsmaybeappliedtodifferentservicesforthesameITSI/GTSI/ExternalNumber,e.g.SS-CFforVoicemayhavedifferentsubscriptionoptionthanSS-CFforDataforthesameITSI/GTSI/ExternalNumber.SubscriptionoptionsforonecallforwardingsupplementaryservicemaybedifferentfromcorrespondingsubscriptionoptionsforanothercallforwardingsupplementaryservicesforthesameITSI/GTSI/ExternalNumber.Anyforwarded-tousershallbeabletodeactivateselectivelycallforwardingforwhichthatuserisaforwarded-touser;thisdeactivationshallbepossibleonlyfortheservicesandthecallforwardingproceduresthataffecttheforwarded-touser.SIST ETS 300 392-10-4 E2:2003

Page14ETS300392-10-4:February2000ContrarytoECMA-173[1],inthecaseofTETRA,theserveduserdoesnotobtainanindicationthatSS-CFiscurrentlyactivatedwhenplacinganoutgoingcallandthisisnotasubscriptionoption.ContrarytoECMA-173[1],theserveduser/forwardinguserdoesnotreceivenotificationthatacallhasbeenforwarded;thisappliesalsotoalltheintermediateservedusers/forwardingusers.Table1:SubscriptionoptionsSubscriptionOptionsValuePermanentactivation-Yes-NoCallinguserreceivesnotificationthatcallhasbeenforwarded-Yeswithoutforwarded-toITSI/GTSI/ExternalNumber(note)ServeduserreleaseshisITSI/GTSI/ExternalNumbertoforwarded-touser-No-YesNOTE:ForTETRA,notactuallyasubscriptionoption.FCshallbegenerallyavailableforallcallsthatinvolvemultiplecallforwarding.NOTE:"Local"aswellas"remote"needstobecounted;localcallsarewithinaSwMI;localcallsmayencountercallforwardingandneedtobeaccountedforaswell.4.2.2Normalprocedures4.2.2.1Activation/deactivation/definition/registration/interrogation4.2.2.1.1Activation/deactivationWithintheTETRAnetworkenvironment,theactivationupondefinitionshallbeused.SS-CFmaybeeitherpermanentlyactivatedoractivated/deactivatedunderusercontrol.Ifactivation/deactivationisunderusercontrol,theSwMImayprovideforactivation/deactivationbyanyauthorizeduser(serveduserornot).InthecaseofSS-CFinvolvingaserveduserbeingaservedgroup,SS-CFmaybepermanentlyactivatedforthatgroupGTSIormaybeactivated/deactivatedbyanauthorizedusermemberornotofthegroup.Amemberofagroupshallnotbeabletoactivate/deactivateSS-CFforthegroupheismemberofunlessheisanauthorizeduser.Incasethereisonlyoneauthorizeduser,itshallbetheserveduser;inothercases,theotherauthorizedusersaredifferentfromtheserveduserandtheservedusermayhavelimitedauthorizedusercapability.Anyauthorizedusermayactivateand/ordeactivateSS-CFfortheserveduser.NOTE1:Criteriaforattributionsofauthorizeduserstatusshallbeimplementationdependent(e.g.dispatchersmaybeauthorized).AnyauthorizedusershallbeabletoactivateSS-CFseparatelyforeachbasicserviceforwhichSS-CFissubscribedtoandtherebyrequestadifferentforwarded-toITSI/GTSI/ExternalNumberforeachbasicserviceforwhichSS-CFissubscribedto;anyauthorizedusershallalsobeabletoactivateSS-CFforallbasicservicesforwhichSS-CFissubscribedto(inwhichcaseasingleITSI/GTSI/ExternalNumbershallbeusedasforwarded-tonumberforallbasicservices).SIST ETS 300 392-10-4 E2:2003

Page15ETS300392-10-4:February2000AnyauthorizedusermayactivateSS-CFattheservedusersuchthattheactivating(e.g.authorizeduser)userbecomestheforwarded-touser.Theserveduser(andonlytheserveduser)shallbeabletoenableandtodisableauthorizeduseractivation/deactivation.Theintendedforwarded-touserwhoisalsoauthorizedusershallbeabletoactivateSS-CFregardlessofwhetherSS-CFisalreadyactiveornot.Theservedusermaydisableanauthorizeduseractivationatanytime.Anyforwarded-tousershallbeabletobecomeanauthorizeduserforthedeactivationofSS-CFforthebasicservicesandtheforwardingproceduresforwhichthisuserisdefinedasaforwarded-touser.Theservedusershallnotbeabletodisablethatdeactivationcapabilitybytheforwarded-touser.Theauthorizedforwarded-tousermaydeactivateSS-CFattheserveduser.Thisshallnotbedependentonwhethertheserveduserhasenabledauthorizeduseractivation.Theforwarded-tousermaybedefinedasatemporaryauthorizeduser;theforwarded-tousershalllosethisauthorizedusercapabilityassoonasSS-CFisdeactivatedinthisway,andshallnotregainthecapabilityifSS-CFisactivatedagaintoadifferentforwarded-touser.Theforwarded-touser,atthesametimeasdeactivatingSS-CFasdescribedabove,maybeabletoactivateSS-CFfromtheservedusertoanotherforwarded-touser(i.e.changethedestinationofSS-CF).Theforwarded-tousershalllosethisauthorizedusercapabilityassoonasSS-CFisreactivatedinthisway.Thenewforwarded-tousershallgainthisauthorizedusercapability.Whenanactivation/deactivationprocedureisperformedsuccessfullybyanauthorizeduser,theserveduserandtheactivating/deactivatingauthorizedusershallbenotified.ThenotificationtotheservedusershallincludetheITSI/GTSI/ExternalNumberoftheforwarded-touserandthebasicservices.NOTE2:Theauthorizedusergetsthesamenotificationaspartoftheactivationprocedure.Itshallbepossible,thattheserveduseractivatesSS-CFandtheauthorizeduserdeactivatesSS-CFandviceversa.Itshallbepossible,thattheauthorizeduserwhodeactivatesSS-CFbedifferentfromtheauthorizeduserwhoactivatedSS-CFandvice-versa.NOTE3:Theuseofapasswordfacilityforauthorizeduseractivationasanimplementationoptionisnotexcluded.4.2.2.1.2Enable/DisableTheserveduser(andonlytheserveduser)shallbeabletoenable/disableanyauthorizeduseractivationwhentheauthorizeduserisdifferentfromtheserveduser.Theservedusershallbeabletoenable/disableanyauthorizeduserdeactivationiftheauthorizeduserisnottheforwarded-touserforthatSS-CFprocedureandforthosebasicservices.ToactivateSS-CF,theauthorizedusershall:1)definetheforwarded-touserITSI/GTSI/ExternalNumber;2)indicatethecircuitmodeforwhichitapplies(i.e.ifSS-CFappliestospeechcallsand/ortodatacalls);thiscorrespondsinfacttothedefinitionproceduredefinedinsubclause14.3.1.5ofETS300392-1[3].NOTE:Verificationthattheforwarded-touserITSI/GTSI/ExternalNumberexistsandthatthespecifiedbasicserviceissubscribedtoatthatITSI/GTSI/ExternalNumbermaybecarriedoutbeforeacceptingtheSS-CFactivationrequest.ThisverificationisoutsidethescopeofthisETS.Theserviceprovidershallreturnnotificationofacceptanceoftherequest.NotificationofacceptanceshallincludetheITSI/GTSI/ExternalNumberoftheforwarded-tousertowhomtheSS-CFisactive.Intheabsenceofanyoftheparametersintheactivationprocedure(e.g.theforwarded-toITSI/GTSI/ExternalNumber),defaultparametersalreadyknowntotheSwMImaybeused.Intheabsenceofbasicserviceinformationprovidedbytheuser,theactivationwillbevalidforallbasicservices.SIST ETS 300 392-10-4 E2:2003

Page16ETS300392-10-4:February2000ItshallbepossibletodeactivateSS-CFbymeansofanexplicitrequestfordeactivation.Anexplicitrequestfordeactivationshallbetreatedasfollows:-ifdeactivationofSS-CFforanindividualbasicserviceisrequested,itshallbeacceptedonlyifSS-CFisalreadyactivatedforthatbasicservice;-ifdeactivationofSS-CFcollectivelyforallbasicservicesisrequested,itshallresultinthediscardingofanyforwarded-toITSI/GTSI/ExternalNumbersforindividualbasicservicesandanyforwarded-toITSI/GTSI/ExternalNumbercollectivelyforallbasicservices.ItshallbepossibletodeactivateSS-CFbyactivatingSS-CFtoadifferentforwarded-toITSI/GTSI/ExternalNumber.ArequestforactivationofSS-CFwhenSS-CFisalreadyactivatedshallbetreatedasfollows:-ifactivationofSS-CFforanindividualbasicserviceisrequested,itshallbeacceptedonlyifSS-CFisnotalreadyactivatedcollectivelyforallbasicservicesand,ifSS-CFisalreadyactivatedforthatindividualbasicservice,shallresultintheoverwritingoftheexistingforwarded-toITSI/GTSI/ExternalNumber;-ifactivationofSS-CFcollectivelyforallbasicservicesisrequested,itshallresultinthediscardingofanyexistingforwarded-toITSI/GTSI/ExternalNumbersforeachbasicserviceandtheoverwritingofanyexistingforwarded-toITSI/GTSI/ExternalNumbercollectivelyforallbasicservices.ContrarytoECMA-173[1],inthecasewhereafirstcallforwardingrequesttoafirstfunctionalentityfails,itshallnotbepossibletorequestasecondcallforwardingagainstasecondfunctionalentity.FCshallbeinvokedinconjunctionwithacallforwardingrequest.Wheninvoked,theforwardingcountershallbesettoaninitialvalueandthenincrementedeachtimethatthecallforwardingrequestisaccepted.Theinitialvalueshallbezerounlessanyknowledgeavailableaboutthehistoryofthecall(e.g.routetaken,inter-working,diversions)isusedtochooseahigherinitialvalue.FCshallterminatewhenthecallrequestreachesitsdestination,isreleased,orleavestheTETRANetwork.4.2.2.1.3RegistrationRegistrationofinformationisperformedbysubscriptionand/oronactivationofSS-CF.Therearenoseparateregistrationprocedures.4.2.2.1.4InterrogationTheSwMImayprovideinterrogationtotheserveduserandtoanyauthorizeduser;theforwarded-tousermaybedefinedasatemporaryauthorizeduser.InthecaseofSS-CFinvolvingaserveduserbeingaservedgroup,SS-CFinterrogationmaybeoperatedbyanyauthorizedusereitherinsideoroutsidethegroup.AmemberofaservedgroupshallnotbeabletointerrogateSS-CFforthegroupheismemberofunlessheisanauthorizeduser.Ifinterrogationisprovided,aSwMIshallsupportinterrogationonaperITSI/GTSI/ExternalNumberbasisforallbasicservicesand/orforauserspecifiedbasicservice.TheSwMIresponsetoaninterrogationrequestshallprovidethefollowinginformationtotheuser:-activatedordeactivatedstateofthesupplementaryservice;-ifactivated:-forwarded-toITSI/GTSI/ExternalNumber;-whetheractivatedforallbasicservicesoranindividualbasicserviceandtheidentityoftheindividualbasicservice.Asadditionalinformation,theinterrogationmayprovideinformationtotheserveduser,whetheractivationbyanauthorizeduserhasbeenenabled.SIST ETS 300 392-10-4 E2:2003

Page17ETS300392-10-4:February2000WhereinterrogationisforallbasicservicesforwhichSS-CFissubscribedtoandSS-CFhasbeenactivatedseparatelyformorethanonebasicservice,theaboveinformationshallberepeatedforeachactivation(e.g.twice,onceforspeechandoncefordata).Ifinterrogationbyauserdifferentfromtheserveduserisprovided,itshallbepossiblefromthefollowingusers:-anyauthorizedusermayinterrogateSS-CFconditionsontheserveduser.Authorizationshallbeimplementationdependent(e.g.dispatchersmaybeauthorized);-theforwarded-tousermayinterrogateSS-CFattheserveduser(butonlyforthoseoptionsforwhichheistheforwarded-touser).TheauthorizeduserinterrogationrequestandresponseshallincludetheinformationasspecifiedfortheserveduserinterrogationandadditionallytheITSI/GTSI/ExternalNumberoftheserveduser.4.2.2.2InvocationandoperationAllincomingcallsindicatingabasicserviceforwhichSS-CFisactiveshallbeforwardedwithoutbeingpresentedtotheserveduser(exceptedforSS-CFNRy).Oncethecallforwardinghasbeeninitiated,theoriginalcalleduserBshallnotbeabletoparticipateinthatforwardedcallregardlessofthefactthattheoriginalcondition,whichleadtotheinitiationofforwarding,disappeared(e.g.userBbusybecomesnonbusyforSS-CFB,userBNotReachablebecomesReachableforSS-CFNRc).-Thefollowingfigure1clarifiestheSS-CFprocedures.AssumethatAcallsB1,whoforwardsthecalltoB2,.,Bm,.,Bx.ThefinalreceiverofthecallisC.ABBBC1mx.Figure1:SS-CFoperation4.2.2.2.1Forwarded-touserCnotificationTheforwarded-tousershallreceiveanindicationthatthecallhasbeenforwardedwiththeappropriateforwardingcause.Accordingtotheserveduser'ssubscriptionoption,theforwarded-tousermayreceive:-theoriginalserveduser'sITSI/GTSI/ExternalNumber;-thecausefortheoriginalforwarding;-thelastforwardingnumberBx;-thecauseforthelastforwarding.Theforwardingcauseshallindicatewhichcallforwardingsupplementaryinvocationleadtotheforwarding(CFU,CFB,CFNRy,CFNRc).4.2.2.2.2CallinguserAnotificationThecallingusershallreceiveanotificationthatthecallhasbeenforwarded.Forsingleforwarding,anotificationshallbesenttothecallinguserindicatingthatcallhasbeenforwarded.SIST ETS 300 392-10-4 E2:2003

Page18ETS300392-10-4:February2000Formultipleforwarding,notificationsshallbesenttothecallinguserdependingonthesubscriptionoptionsoftheservedusersasfollows:-anotificationshallbesenttoUserAasaresultoftheforwardingatuserB1.ForwardingatsuccessiveservedusersB2,B3,etc.eachshallalsoresultinanotificationtoUserA,butonlyifboth:-thealertingstatehasbeenreachedattheserveduser;and-noneoftheservedusershasthe"No"option(inthecaseofinterworking).TheITSI/GTSI/ExternalNumberofUserCshallbesenttoUserA,butonlyifSS-COLRisnotinvokedbyUserC.NOTE1:EachuserB1,B2,…,Bn-1,Bnarefirstforwarded-touserswhobecomesuccessivelyserveduserswiththeirownsubscriptionoptions.NOTE2:Thisdoesnotapplytoeitherdirectsignalingoperationortogroupcall.NOTE3:UserAMS/LSmayreceiveanD-ALERTwithoneorigin(userBalerting)followedbyaD-CONNECTfromadifferentsource(C).4.2.3Exceptionalprocedures4.2.3.1Activation/DeactivationSS-CFforallbasicservicesandSS-CFforparticularbasicservicescannotbeactivatedsimultaneously.IftheSwMIcannotacceptanactivationrequest,theactivating(authorized/served)usershallreceiveanotificationthatSS-CFactivationwasunsuccessful.Possiblecausesforrejectionaree.g.:-serviceoroptionnotsubscribedto;-authorizedusernotenabledforactivationofSS-CF;-insufficientinformation;-forwarded-toITSI/GTSI/ExternalNumberisaspecialservicecode;-forwarded-toITSI/GTSI/ExternalNumberistheserveduser'sITSI/GTSI/ExternalNumber;-forwarded-toITSI/GTSI/ExternalNumberisaninvalidITSI/GTSI/ExternalNumber;-basicservicetowhichrelevanceisrequestedisnotsubscribedto;-incorrectserveduser'sITSI/GTSI/ExternalNumber;-conflictingsituationwithothersupplementaryservices(e.g.SS-BOC).IftheSwMIcannotacceptadeactivationrequest,thedeactivating(authorized/served)usershallreceiveanotificationthatSS-CFdeactivationwasunsuccessful.Possiblecausesforrejectionaree.g.:-serviceoroptionnotsubscribedto;-insufficientinformation;-servicenotactivated;-incorrectserveduser'sITSI/GTSI/ExternalNumber.IfthenetworkdeactivatesSS-CFwithouttheserveduserhavingrequesteddeactivation(e.g.whenanexceptionalconditionoccurs),theserveduserwillreceivenotificationalongwiththecause.Thenotificationofanunsuccessfulactivation/deactivationrequestshallbesenttotheactivating/deactivating(authorized/served)useronly.4.2.3.2InterrogationIftheSwMIcannotacceptaninterrogationrequest,theinterrogatingusershallreceiveanotificationthatSS-CFinterrogationwasunsuccessful.Possiblecausesforrejectionaree.g.:-serviceoroptionnotsubscribedto;-insufficientinformation;-basicservicetowhichrelevanceisrequestedisnotsubscribedto.SIST ETS 300 392-10-4 E2:2003

Page19ETS300392-10-4:February20004.2.3.3InvocationandoperationSS-CFshallnotbeinvokedonacalltotheserveduserifthecallusesabasicserviceforwhichSS-CFhasnotbeenactivated.Incaseswhereacallingusernormallyreceives,aspartofnotification,theITSI/GTSI/ExternalNumberoftheforwarded-touser,thelastforwardinguserortheoriginalcalleduserandthisITSI/GTSI/ExternalNumberisunavailable(e.g.duetonumberpresentationrestriction,orinter-working),theuserwhowouldhavebeengiventhenumbershallreceiveanindicationofthereasonwhynonumberisgiven.WithinaSwMIthetotalnumberofallforwardingforeachcallshallbelimited.Themaximumnumberofsuchforwardingforeachcallshallbeanimplementationoption.Whencountingthenumberofforwarding,alltypesofforwardingshallbeincluded.Ifthelimitisreachedandanattemptismadetoforwardthecallanadditionaltime,thecallingusershallrece
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