ETSI EN 300 207-1 V2.0.1 (2000-04)

Integrated Services Digital Network (ISDN); Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

REN/SPAN-05170-1

Digitalno omrežje z integriranimi storitvami (ISDN) – Dopolnilne storitve: izsmeritev – Protokol digitalne naročniške signalizacije št. 1 (DSS1) – 1. del: Specifikacija protokola

General Information

• Status: Published
• Publication Date: 26-Apr-2000
• Technical Committee: SPAN 5 4 - Supplementary services
• Current Stage: 12 - Completion
• Due Date: 12-May-2000
• Completion Date: 27-Apr-2000
• Ref Project: SIST EN 300 207-1 V2.0.1:2003 - Integrated Services Digital Network (ISDN); Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VWRULWYHIntegrated Services Digital Network (ISDN); Diversion supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 207-1 Version 2.0.1SIST EN 300 207-1 V2.0.1:2003en01-december-2003SIST EN 300 207-1 V2.0.1:2003SLOVENSKI
STANDARD



SIST EN 300 207-1 V2.0.1:2003



ETSIEN300207-1V2.0.1(2000-04)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);Diversionsupplementaryservices;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:ProtocolspecificationSIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)2ReferenceREN/SPAN-05170-1KeywordsISDN,DSS1,supplementaryservice,CF,SCF,SCFB,SCFNR,SCFU,DDI,protocolImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthisdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail] EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)3ContentsIntellectualPropertyRights.5Foreword.51Scope.72References.83Definitions.94Abbreviations.115Description.126Operationalrequirements.136.1Provisionandwithdrawal.136.2Requirementsonthecallinguser'snetworkside.156.3Requirementsontheserveduser'snetworkside.156.4Requirementsonthediverted-touser'snetworkside.157Codingrequirements.167.1CodingoftheFacilityinformationelementcomponents.167.2Codingoftheinformationelements.227.2.1CodingoftheNotificationindicatorinformationelement.227.2.2CodingoftheRedirectingnumberinformationelement.237.2.3CodingoftheRedirectionnumberinformationelement.238Statedefinitions.249SignallingproceduresatthecoincidentSandTreferencepoint.259.1Activation,deactivationandinterrogation.259.1.1Activation.259.1.1.1Normaloperationfordiversionservicesotherthanselectivecallforwardingservice.259.1.1.2Exceptionalproceduresfordiversionservicesotherthanselectivecallforwardingservices.279.1.1.3Normaloperationfortheselectivecallforwardingservices.289.1.1.4Exceptionalproceduresfortheselectivecallforwardingservices.309.1.2Deactivation.319.1.2.1Normaloperationfordiversionservicesotherthanselectivecallforwardingservices.319.1.2.2Exceptionalproceduresfordiversionservicesotherthanselectivecallforwardingservices.329.1.2.3Normaloperationfortheselectivecallforwardingservices.339.1.2.4Exceptionalproceduresfortheselectivecallforwardingservices.349.1.3Interrogationoftheservedusernumbers.359.1.3.1Normalprocedures.359.1.3.2Exceptionalprocedures.359.1.4Interrogationofasingleormultipleinstancesofthesupplementaryservice.369.1.4.1Normaloperationfordiversionservicesotherthantheselectivecallforwardingservices.369.1.4.2Exceptionalproceduresfordiversionservicesotherthantheselectivecallforwardingservices.379.1.4.3Normaloperationsforselectivecallforwardingservices.389.1.4.4Exceptionalproceduresfortheselectivecallforwardingservices.389.1.5Proceduresforinterrogationofaspecificscreeninglist.399.1.5.1Normalprocedures.399.1.5.2Exceptionalprocedures.409.2Invocationandoperation.409.2.1Collectionandanalysisofdiversioninformationatthecallingnetwork.409.2.1.1Normaloperation.409.2.1.2Exceptionalprocedures.419.2.2Notificationofdiversiontothecallinguser.419.2.2.1Normaloperation.419.2.2.2Exceptionalprocedures.419.2.3Identificationofthediverted-tousertothecallinguser.42SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)49.2.3.1Normaloperation.429.2.3.2Exceptionalprocedures.429.2.4Operationattheserveduser.439.2.4.1ProceduresfortheCFUsupplementaryservice.439.2.4.1.1Normaloperation.439.2.4.1.2Exceptionalprocedures.449.2.4.2NetworkDeterminedUserBusy(NDUB)proceduresfortheCFBsupplementaryservice.449.2.4.2.1Normaloperation.449.2.4.2.2Exceptionalprocedures.459.2.4.3UserDeterminedUserBusy(UDUB)proceduresfortheCFBsupplementaryservice.459.2.4.3.1Normaloperation.459.2.4.3.2Exceptionalprocedures.469.2.4.4ProceduresfortheCFNRsupplementaryservice.469.2.4.4.1Normaloperation.469.2.4.4.2Exceptionalprocedures.479.2.4.5ProceduresfortheCDsupplementaryservice.479.2.4.5.1Normaloperation.479.2.4.5.2Exceptionalprocedures.499.2.4.6ProceduresfortheSCFsupplementaryservice.499.2.5Operationatthediverted-touser.509.2.5.1Normaloperation.509.2.5.2Exceptionalprocedures.519.3Remindernotificationtotheserveduser.519.3.1Normaloperation.519.3.2Exceptionalprocedures.5110ProceduresforinterworkingwithprivateISDNs.5210.1ProcedureswhereacallfromthepublicISDNisdivertedwithinorbeyondtheprivateISDN.5210.1.1Normaloperation.5210.1.2Exceptionalprocedures.5210.2PresentationofadivertedcallfromapublicISDNtotheprivateISDN.5310.2.1Normaloperation.5310.2.2Exceptionalprocedures.5310.3ProcedureswhereacallfromtheprivateISDNisdivertedwithinorbeyondthepublicISDN.5310.4PresentationofadivertedcallfromaprivateISDNtothepublicISDN.5410.4.1Normaloperation.5410.4.2Exceptionalprocedures.5410.5ProcedureswhereacallfromthepublicISDNisdivertedwithinorbeyondtheprivateISDNandpartialrerouteingtakesplaceinthepublicISDN.5510.5.1Normaloperation.5510.5.2Exceptionalprocedures.5710.6ProcedureswhereacallfromthepublicISDNtotheprivateISDNisdivertedbythepublicISDNwhenDiversionserviceenhancementsbasedonDDIrangesdonotapply.5810.7ProcedureswhereacallfromthepublicISDNtotheprivateISDNisdivertedbythepublicISDNwhenDiversionserviceenhancementsbasedonDDIrangesapply.5811Interactionswithothernetworks.5912Interactionwithothersupplementaryservices.5913Parametervalues(timers).5914Dynamicdescription(SDLdiagrams).60AnnexA(informative):Changehistory.61A.1ChangesfromETS300207-1(1994)toEN300207-1(1998).61A.2ChangesfromEN300207-1(1998).61History.62SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeServicesandProtocolsforAdvancedNetworks(SPAN).Thepresentdocumentispart1ofamulti-partENcoveringtheDigitalSubscriberSignallingSystemNo.one(DSS1)protocolspecificationfortheIntegratedServicesDigitalNetwork(ISDN)diversionsupplementaryservices,asdescribedbelow:Part1:"Protocolspecification";Part2:"ProtocolImplementationConformanceStatement(PICS)proformaspecification";Part3:"TestSuiteStructureandTestPurposes(TSS&TP)specificationfortheuser";Part4:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuser";Part5:"TestSuiteStructureandTestPurposes(TSS&TP)specificationforthenetwork";Part6:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetwork".InaccordancewithCCITTRecommendationI.130[4],thefollowingthreelevelstructureisusedtodescribethesupplementarytelecommunicationservicesasprovidedbyEuropeanpublictelecommunicationsoperatorsunderthepan-EuropeanISDN:-stageone:isanoverallservicedescription,fromtheuser'sstandpoint;-stagetwo:identifiesthefunctionalcapabilitiesandinformationflowsneededtosupporttheservicedescribedinstageone;and-stagethree:definesthesignallingsystemprotocolsandswitchingfunctionsneededtoimplementtheservicedescribedinstageone.Thepresentdocumentdetailsthestagethreeaspects(signallingsystemprotocolsandswitchingfunctions)neededtosupportthediversionsupplementaryservices.ThestageoneaspectsaredetailedinETS300199[14](1994)[14]ETS300200[15](1994)[15],ETS300201[16](1994)[16],ETS300202[17](1994)[17]andEN301133[18].ThestagetwoaspectsaredetailedinETS300203[22](1994)[22],ETS300204[23](1994)[23],ETS300205[24](1994)[24]andETS300206[25](1994)[25].ChangesfromthepreviousversionofthepresentdocumentareshowninannexA.SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)6NationaltranspositiondatesDateofadoptionofthisEN:21April2000DateoflatestannouncementofthisEN(doa):31July2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31January2001DateofwithdrawalofanyconflictingNationalStandard(dow):31January2001SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)71ScopeThisfirstpartofEN300207specifiesthestagethreeofthediversionsupplementaryservicesforthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN)asprovidedbyEuropeanpublictelecommunicationsoperatorsattheTreferencepointorcoincidentSandTreferencepoint(asdefinedinITU-TRecommendationI.411[9])bymeansoftheDigitalSubscriberSignallingSystemNo.one(DSS1).Stagethreeidentifiestheprotocolproceduresandswitchingfunctionsneededtosupportatelecommunicationservice(seeCCITTRecommendationI.130[4]).Inaddition,thepresentdocumentspecifiestheprotocolrequirementsattheTreferencepointwheretheserviceisprovidedtotheuserviaanintermediateprivateISDN.ThepresentdocumentdoesnotspecifytheadditionalprotocolrequirementswheretheserviceisprovidedtotheuserviaatelecommunicationsnetworkthatisnotanISDN.Thediversionsupplementaryservicescomprisethefollowingservices:-CallForwardingUnconditional(CFU)supplementaryservice;-CallForwardingBusy(CFB)supplementaryservice;-CallForwardingNoReply(CFNR)supplementaryservice;-SelectiveCallForwardingUnconditional(SCFU)supplementaryservice;-SelectiveCallForwardingBusy(SCFB)supplementaryservice;-SelectiveCallForwardingNoReply(SCFNR)supplementaryservice;-CallDeflection(CD)supplementaryservice.TheCFUsupplementaryserviceenablesaservedusertohavethenetworkredirecttoanotherusercallswhichareaddressedtotheserveduser'sISDNnumber.TheCFUsupplementaryservicemayoperateonallcalls,orjustthoseassociatedwithspecifiedbasicservices.Theserveduser'sabilitytooriginatecallsisunaffectedbytheCFUsupplementaryservice.AftertheCFUsupplementaryservicehasbeenactivated,callsareforwardedindependentofthestatusoftheserveduser.TheCFBsupplementaryserviceenablesaservedusertohavethenetworkredirecttoanotherusercallswhichareaddressedtotheserveduser'sISDNnumberandmeetbusy.TheCFBsupplementaryservicemayoperateonallcalls,orjustthoseassociatedwithspecifiedbasicservices.Theserveduser'sabilitytooriginatecallsisunaffectedbytheCFBsupplementaryservice.TheCFNRsupplementaryserviceenablesaservedusertohavethenetworkredirecttoanotherusercallswhichareaddressedtotheserveduser'sISDNnumber,andforwhichtheconnectionisnotestablishedwithinadefinedperiodoftime.TheCFNRsupplementaryservicemayoperateonallcalls,orjustthoseassociatedwithspecifiedbasicservices.Theserveduser'sabilitytooriginatecallsisunaffectedbytheCFNRsupplementaryservice.TheSCFsupplementaryserviceenablesaservedusertospecifytheforwardingoftheirincomingcallstoaselecteddestinationsubjecttocertainconditionsorcircumstancese.g.thecallinglineidentityofthecallinguser.Theuserisalsoallowedtointerrogatethescreeninglist.TheCDsupplementaryserviceenablestheservedusertorespondtoanincomingcallbyrequestingredirectionofthatcalltoanotheruser.TheCDsupplementaryservicecanonlybeinvokedbeforetheconnectionisestablishedbytheserveduser,i.e.inresponsetotheofferedcall,orduringtheperiodthattheserveduserisbeinginformedofthecall.Theserveduser'sabilitytooriginatecallsisunaffectedbytheCDsupplementaryservice.ThepresentdocumentalsodescribesinteractionsforServiceenhancementsbasedonDDIrangesforDiversionservicesdetailedinES201481[20].Thediversionsupplementaryservicesareapplicabletoallcircuit-switchedtelecommunicationservices.FurtherpartsofEN300207specifythemethodoftestingrequiredtoidentifyconformancetothepresentdocument.SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)8Thepresentdocumentisapplicabletoequipmentsupportingatleastoneofthediversionsupplementaryservices,tobeattachedateithersideofaTreferencepointorcoincidentSandTreferencepointwhenusedasanaccesstothepublicISDN.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]CCITTRecommendationX.208(1988):"SpecificationofAbstractSyntaxNotationOne(ASN.1)".[2]CCITTRecommendationX.219(1988):"Remoteoperations:Model,notationandservicedefinitions".[3]CCITTRecommendationZ.100(1988):"SpecificationandDescriptionLanguage(SDL)".[4]CCITTRecommendationI.130(1988):"MethodforthecharacterizationoftelecommunicationservicessupportedbyanISDNandnetworkcapabilitiesofanISDN".[5]ITU-TRecommendationE.164(1997):"Theinternationalpublictelecommunicationnumberingplan".[6]ITU-TRecommendationI.112(1993):"VocabularyoftermsforISDNs".[7]ITU-TRecommendationI.210(1993):"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".[8]ITU-TRecommendationI.221(1993):"Commonspecificcharacteristicsofservices".[9]ITU-TRecommendationI.411(1993):"ISDNuser-networkinterfaces;Referenceconfigurations".[10]ENV41007-1(1991):"Definitionoftermsinprivatetelecommunicationnetworks;Part1:Definitionofgeneralterms".[11]ETSIEN300403-1:"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Signallingnetworklayerforcircuit-modebasiccallcontrol;Part1:Protocolspecification[ITU-TRecommendationQ.931(1993),modified]".[12]ETSIEN300195-1:"IntegratedServicesDigitalNetwork(ISDN);Supplementaryserviceinteractions;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[13]ETSIEN300196-1:"IntegratedServicesDigitalNetwork(ISDN);Genericfunctionalprotocolforthesupportofsupplementaryservices;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[14]ETSIETS300199(1994):"IntegratedServicesDigitalNetwork(ISDN);CallForwardingBusy(CFB)supplementaryservice;Servicedescription".[15]ETSIETS300200(1994):"IntegratedServicesDigitalNetwork(ISDN);CallForwardingUnconditional(CFU)supplementaryservice;Servicedescription".SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)9[16]ETSIETS300201(1994):"IntegratedServicesDigitalNetwork(ISDN);CallForwardingNoReply(CFNR)supplementaryservice;Servicedescription".[17]ETSIETS300202(1994):"IntegratedServicesDigitalNetwork(ISDN);CallDeflection(CD)supplementaryservice;Servicedescription".[18]ETSIEN301133(V1.1):"IntegratedServicesDigitalNetwork(ISDN);SelectiveCallForwarding(SCF)supplementaryservices(unconditional,busyandnoreply);Servicedescription".[19]ETSIEN300286-1:"IntegratedServicesDigitalNetwork(ISDN);User-to-UserSignalling(UUS)supplementaryservice;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[20]ETSIES201481:"IntegratedServicesDigitalNetwork(ISDN);ISDNserviceenhancementsbasedonDDIrangesforcalldiversionsupplementaryservices".[21]Void.[22]ETSIETS300203:"IntegratedServicesDigitalNetwork(ISDN);CallForwardingBusy(CFB)supplementaryservice;Functionalcapabilitiesandinformationflows".[23]ETSIETS300204:"IntegratedServicesDigitalNetwork(ISDN);CallForwardingUnconditional(CFU)supplementaryservice;Functionalcapabilitiesandinformationflows".[24]ETSIETS300205:"IntegratedServicesDigitalNetwork(ISDN);CallForwardingNoReply(CFNR)supplementaryservice;Functionalcapabilitiesandinformationflows".[25]ETSIETS300206:"IntegratedServicesDigitalNetwork(ISDN);CallDeflection(CD)supplementaryservice;Functionalcapabilitiesandinformationflows".[26]ETSIETS300062:"IntegratedServicesDigitalNetwork(ISDN);DirectDiallingIn(DDI)supplementaryservice;ServiceDescription".3DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:address:addressisanISDNnumber,withoptionallyanassociatedsubaddressalertingphase:periodwheretheconnectionattheremoteaccessissuchthatifitisanISDNinterface,itisincallstateN7,CallReceived,andifitisananalogueinterface,analertingindicationisbeingprovidedallnumbers:ifforthecontrolofthecallforwardingsupplementaryservicestheparameterservedUserNrissetto"allNumbers",thenalltheISDNnumbersareaffectedthattheuserissubscribedtoandforwhichthecallforwardingsupplementaryserviceissubscribedto,atthepointintimethattherequestisreceivedinthenetworkallservices:ifforthecontrolofthecallforwardingsupplementaryservicestheparameterbasicServiceissetto"allServices"thenallbasicservicesareaffectedthattheuserissubscribedto,andforwhichthecallforwardingsupplementaryserviceappliesandissubscribedto,atthepointintimethattherequestisreceivedinthenetworkbasicservice:bearerserviceorteleservice.Whenusedinthepresentdocumentitrefersonlytocircuit-switchedbasicservicesbearerservice:seeITU-TRecommendationI.112[6],definition202callcontrolmessage:messageasdefinedinEN300403-1[11],subclause3.1,whichonsendingorreceiptcausesachangeofthecallstateateitherthenetworkortheuser.CallcontrolmessagesalsoincludetheINFORMATIONmessageandthePROGRESSmessagecallreference:seeEN300196-1[13],subclause3.1SIST EN 300 207-1 V2.0.1:2003



ETSIETSIEN300207-1V2.0.1(2000-04)10callstate:stateasdefinedinEN300403-1[11],foreithertheuserorthenetworkasappropriate.Acallstatemayexistforeachcallreferencevalue(andforeachadditionalrespondingConnectionEndpointIdentifier(CEI)intheincomingcallstates)callingnetwork:networktowhichthecallinguserisattachedcallinguser:userwhoinitiatedacallthathasbeendiverteddatalinkconnectionendpointidentifier;ConnectionEndpointIdentifier(CEI):seeEN300196-1[13],subclause3.1DDInumber:seeETS300062[26],definitionsDDIrange:seeES201481[20],definitionsDDIrangeidentifier:seeES201481[20],definitionsdeflected-tonumber:ISDNnumberofthedeflected-touserdeflected-touser:usertowhichthecallisredirectedasaresultofdeflectiondeflectingnumber:ISDNnumberofthedeflectinguserdiverted-touser:referseithertotheforwarded-touserortothedeflected-touserdiverted-tonetwork:networktowhichthediverted-touserisattacheddiverted-tonumber:ISDNnumberoftheforwarded-toorthedeflected-touserdivertingnetwork:networktowhichtheserveduser(divertinguser)isattacheddivertingnumber:ISDNnumberoftheforwarding/deflectinguserdiversionprofile:setofdatacontainingalltheparameterspertainingtosubscriptionandactivation,involvedinthedecisionprocesswhichleadstothediversionofanincomingcalldummycallreference:seeEN300196-1[13],subclause3.1explicitforwarding:forwardallcallsfromspecifiedcallingnumber(s)forwarded-toaddress:addressoftheforwarded-touserforwarded-tonetwork:networktowhichtheforwarded-touserisattachedforwarded-tonumber:ISDNnumberoftheforwarded-touserforwarded-touser:usertowhichthecallisredirectedasaresultofforwardingforwardingnetwork:networktowhichtheserveduser(forwardinguser)isattachedforwardingnumber:ISDNnumberoftheforwardinguserimplicitforwarding:forwardallcallsexceptfromthespecifiedcallingnumber(s)IntegratedServicesDigitalNetwork(ISDN):seeITU-TRecommendationI.112[6],definition308invokecomponent:seeEN300196-1[13],subclause8.2.2.1.Wherereferenceismadetoan"xxxx"invokecomponent,aninvokecomponentismeantwithitsoperationvaluesettot
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