SIST EN 301 484-1 V1.1.1:2005
(Main)Integrated Services Digital Network (ISDN); Line Hunting (LH) supplementary service; Digital Subscriber Signalling System No. one (DSS1); Part 1: Protocol specification
General Information
- Abstract
The Line Hunting supplementary service enables calls to a single ISDN number to be offered to a free access in a group of basic accesses. The Line Hunting supplementary service is intended for use on accesses to which terminals are connected at the S/T references point
- Status
- Published
- Publication Date
- 31-Dec-2004
- Technical Committee
- SPN - Services and Protocols for Networks
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jan-2005
- Due Date
- 01-Jan-2005
- Completion Date
- 01-Jan-2005
Overview
SIST EN 301 484-1 V1.1.1:2005 specifies the protocol for the Line Hunting (LH) supplementary service within the Integrated Services Digital Network (ISDN) environment, using Digital Subscriber Signalling System No. One (DSS1). This European standard, adopted by the Slovenian Institute for Standardization (SIST), defines the telecommunication protocols and switching functions required at the user-network interface (S/T reference point) to support line hunting across ISDN basic or primary rate accesses.
The Line Hunting (LH) service enables incoming calls to a single ISDN number (hunt group number) to be distributed to any free access within a group of lines, improving call distribution efficiency and resource utilization for business and enterprise customers.
Key Topics
- Line Hunting Supplementary Service: Allows calls directed to a single ISDN number to be dynamically routed to an available line in a predefined group (hunt group) at the S/T interface points.
- Protocol Scope: Details the necessary signalling system protocols (DSS1) and switching functions required to implement line hunting, focusing on circuit-switched telecommunication services over ISDN.
- Reference Point: Applicable at the S/T or coincident S and T reference points, as defined in ITU-T Recommendation I.411.
- Service Features:
- Sequential or cyclic hunting methods for selecting a free access
- Hunt group withdrawal and cancellation options (temporary removal of access from the hunt group)
- User notification when access is withdrawn
- Subscription options for hunt groups and individual accesses
- Support for basic and (optionally) primary rate accesses
Applications
- Business Telephony: Enables organizations to ensure all incoming business calls to a main number are answered by distributing calls across multiple ISDN terminals or lines, reducing missed calls and improving customer service.
- Call Center and Reception Services: Supports efficient distribution of incoming calls to the next available agent or operator in environments where multiple personnel handle calls routed to a shared number.
- Scalable Communications: Provides flexibility for small to large enterprises by allowing the expansion of hunt groups, the allocation of multiple channels, and granular control over line assignment.
- Network Resource Optimization: Maximizes utilization of ISDN access lines by automatically routing calls to free channels within a hunt group, supporting continuity and service availability.
Related Standards
- EN 301 479: Describes the service aspects and general principles for line hunting supplementary service within ISDN.
- EN 300 195-1: Covers supplementary service interactions and the DSS1 protocol.
- EN 300 196-1: Provides the generic functional protocol supporting supplementary services over DSS1.
- EN 300 403-1: Details the DSS1 protocol for circuit-mode basic call control on ISDN.
- ITU-T Recommendations:
- I.411: ISDN user-network interfaces - Reference configurations
- Q.931: ISDN layer 3 user-network interface - Call control protocol
- I.210: Principles of telecommunication services supported by an ISDN
- X.680, X.880: ASN.1 notation and remote operations concept and model
Keywords: ISDN, line hunting, supplementary service, DSS1, protocol specification, hunt group, S/T interface, telecommunication standards, business telephony, call distribution
By following the provisions in SIST EN 301 484-1 V1.1.1:2005, telecommunications providers can ensure interoperability, efficiency, and robust supplementary services for ISDN subscribers across Europe.
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Frequently Asked Questions
SIST EN 301 484-1 V1.1.1:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Line Hunting (LH) supplementary service; Digital Subscriber Signalling System No. one (DSS1); Part 1: Protocol specification". This standard covers: The Line Hunting supplementary service enables calls to a single ISDN number to be offered to a free access in a group of basic accesses. The Line Hunting supplementary service is intended for use on accesses to which terminals are connected at the S/T references point
The Line Hunting supplementary service enables calls to a single ISDN number to be offered to a free access in a group of basic accesses. The Line Hunting supplementary service is intended for use on accesses to which terminals are connected at the S/T references point
SIST EN 301 484-1 V1.1.1:2005 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 484-1 V1.1.1:2005 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Integrated Services Digital Network (ISDN); Line Hunting (LH) supplementary service; Digital Subscriber Signalling System No. one (DSS1); Part 1: Protocol specification33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 301 484-1 Version 1.1.1SIST EN 301 484-1 V1.1.1:2005en01-januar-2005SIST EN 301 484-1 V1.1.1:2005SLOVENSKI
STANDARD
ETSIEN301484-1V1.1.1(2000-04)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);LineHunting(LH)supplementaryservice;DigitalSubscriberSignallingSystemNo.one(DSS1);Part1:ProtocolspecificationSIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)2ReferenceDEN/SPAN-05171-1KeywordsISDN,DSS1,supplementaryservice,LH,protocolImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthisdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frSIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)3ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.63Definitions.74Abbreviations.85Description.86OperationalRequirements.96.1ProvisionandWithdrawal.96.2Requirementsontheoriginatingnetworkside.106.3Requirementsonthedestinationnetworkside.107Codingrequirements.107.1CodingoftheFacilityinformationelementcomponents.108StateDefinitions.129SignallingProceduresatthecoincidentSandTreferencepoints.129.1Activation,deactivationandinterrogation.129.1.1TemporaryHuntGroupwithdrawal.129.1.1.1Normaloperation.129.1.1.2Exceptionalprocedures.139.1.2CancellationofTemporaryHuntGroupwithdrawal.139.1.2.1Normaloperation.139.1.2.2Exceptionalprocedures.149.1.3Interrogation.149.1.3.1NormalOperation.149.1.3.2Exceptionalprocedures.159.2InvocationandOperation.159.2.1Normaloperation.159.2.2Exceptionalprocedures.159.3Notificationtouserofwithdrawalofanaccessfromahuntgroup.1610ProceduresforinterworkingwithprivateISDNs.1611Interactionswithothernetworks.1612Interactionwithothersupplementaryservices.1613Parametervalues(timers).1614Dynamicdescription(SDLdiagrams).16AnnexA(informative):Signallingflows.17History.19SIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)4IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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-partENcoveringtheIntegratedServicesDigitalNetwork(ISDN);LineHunting(LH)supplementaryservice;DigitalSubscriberSignallingSystemNo.one(DSS1),asidentifiedbelow:Part1:"Protocolspecification";Part2:"ProtocolImplementationConformanceStatement(PICS)proformaspecification";Part3:"TestSuiteStructureandTestPurposes(TSS&TP)specificationsfortheuser";Part4:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuser";Part5:"TestSuiteStructureandTestPurposes(TSS&TP)specificationforthenetwork";Part6:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetwork".InaccordancewithCCITTRecommendationI.130[7],thefollowingthreelevelstructureisusedtodescribethesupplementarytelecommunicationservicesasprovidedbyEuropeanpublictelecommunicationsoperatorsunderthepan-EuropeanISDN:-stage1:isanoverallservicedescription,fromtheuser'sstandpoint;-stage2:identifiesthefunctionalcapabilitiesandinformationflowsneededtosupporttheservicedescribedinstage1;and-stage3:definesthesignallingsystemprotocolsandswitchingfunctionsneededtoimplementtheservicedescribedinstage1.Thepresentdocumentdetailsthestage3aspects(signallingsystemprotocolsandswitchingfunctions)neededtosupporttheLineHuntingsupplementaryservice.Thestage1aspectsaredetailedindraftEN301479[1].Thestage2aspectsoftheLineHuntingsupplementaryservicehavenotbeenspecified.SIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)5NationaltranspositiondatesDateofadoptionofthisEN:21April2000DateoflatestannouncementofthisEN(doa):31July2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31January2001DateofwithdrawalofanyconflictingNationalStandard(dow):31January2001SIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)61ScopeThepresentdocumentspecifiesthestagethreeoftheLineHunting(LH)supplementaryserviceforthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN)asprovidedbytheEuropeanpublictelecommunicationsoperatorsattheTreferencepointorcoincidentSandTreferencepoint(asdefinedinITU-TRecommendationI.411[13])bymeansoftheDigitalSubscriberSystemNo.one(DSS1).Stagethreeidentifiestheprotocolproceduresandswitchingfunctionsneededtosupportatelecommunicationsservice(seeCCITTRecommendationI.130[7]).ThepresentdocumentdoesnotspecifytheadditionalprotocolrequirementswheretheserviceisprovidedtotheuserviaatelecommunicationsnetworkthatisnotanISDN.TheLHsupplementaryserviceenablescallstoasingleISDNnumbertobeofferedtoafreeaccessinagroupofaccessestowhichterminalsareconnected.Theprinciplesfortheselectionofafreechannelwithinanaccessareanetworkprovidermatteraspartofthebasiccallproceduresandsoareoutsidethescopeofthepresentdocument.TheLHserviceisapplicabletoallcircuit-switchedtelecommunicationserviceswiththeexceptionofservicesrequiringtheuseofmorethanoneB-channel.FurtherpartsofEN301484specifythemethodoftestingrequiredtoidentifyconformancetothepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETSIEN301479:"IntegratedServicesDigitalNetwork(ISDN);LineHunting(LH)supplementaryservice;ServiceDescription".[2]ETSIEN300195-1:"IntegratedServicesDigitalNetwork(ISDN);Supplementaryserviceinteractions;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[3]ETSIEN300196-1:"IntegratedServicesDigitalNetwork(ISDN);Genericfunctionalprotocolforthesupportofsupplementaryservices;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[4]ETSIEN300403-1:"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Signallingnetworklayerforcircuit-modebasiccallcontrol;Part1:Protocolspecification[ITU-TRecommendationQ.931(1993),modified]".[5]ITU-TRecommendationI.112:"VocabularyoftermsforISDNs".[6]ITU-TRecommendationI.210:"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".[7]CCITTRecommendationI.130:"MethodforthecharacterizationoftelecommunicationservicessupportedbyanISDNandnetworkcapabilitiesofanISDN".SIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)7[8]ETSIEN300089:"IntegratedServicesDigitalNetwork(ISDN);CallingLineIdentificationPresentation(CLIP)supplementaryservice;Servicedescription".[9]ITU-TRecommendationZ.100:"CCITTSpecificationanddescriptionlanguage(SDL)".[10]ITU-TRecommendationE.164:"Theinternationalpublictelecommunicationnumberingplan".[11]ITU-TRecommendationX.680:"Informationtechnology-AbstractSyntaxNotationOne(ASN.1):Specificationofbasicnotation".[12]ITU-TRecommendationX.880:"Informationtechnology-RemoteOperations:Concepts,modelandnotation".[13]ITU-TRecommendationI.411:"ISDNuser-networkinterfaces-Referenceconfigurations".[14]ITU-TRecommendationI.221:"Commonspecificcharacteristicsofservices".3DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:Access:generaltermusedinthepresentdocument,denotingbasicaccessesandasanetworkprovideroption,primaryrateaccessesBasicaccess:seeITU-TRecommendationI.112[5],subclause2.4,definition425Basiccallprocedures:proceduresbywhichacall(asaninstanceofabasictelecommunicationsservice)isestablishedandterminatedCyclichunting:selectionofafreeaccessalwaysstartsatthenextaccessaftertheoneusedlast,andfollowsafixedorder.Whenthelastaccessinthegroupisreached,thesearchcontinuesfromthebeginningofthegroupuntilallaccessesinthegrouphavebeensearched,orafreeaccessisfoundDefaultnumber:definedfortheCLIPserviceinEN300089[8]NOTE:Inordertoprovideconsistencyfromacustomerperspectivethesamedefaultnumbermaybeassociatedwithalltheaccessesthatgotoauserinstallation.InthissituationthedefaultnumberisaHuntGroupNumberandtheHuntGroupitrelatestocontainsalltheaccessesthatgotoauserinstallation.Freeaccess:accesstowhichthecallcanbeofferedwithoutexceedingthenumberofusedB-channelsspecifiedforthisaccessHuntgroup:numberofaccessesoverwhichtheLHsupplementaryserviceappliesfortheassignedISDNnumber.AhuntgroupmayconsistofasingleaccessHuntgroupnumber:ISDNnumber,towhichtheLHsupplementaryserviceisallocatedandtowhichISDNbasicservicesandsupplementaryservicesrelatingtothehuntgroupareallocatedHuntgroupwithdrawal:requestbyaaccessofthehuntgroupinordertotemporarilypreventthisaccessfromreceivingcallstothehuntgroup(existingcallsarenotaffected)Individualnumber:(inthecontextofthepresentdocument)ISDNnumberwhichisnotahuntgroupnumber,butwhichcanbeassociatedwithanaccessthatbelongstoahuntgroupinordertoidentifyoneormoreterminalsconnectedtotheaccessIntegratedServicesDigitalNetwork(ISDN):seeITU-TRecommendationI.112[5],subclause2.3,definition308ISDNnumber:numberconformingtothenumberingplanandstructurespecifiedinITU-TRecommendationE.164[10]Network:DSS1protocolentityatthenetworksideoftheuser-networkinterfaceNetworkdetermineduserbusy:seeITU-TRecommendationI.221[14],subclause2.1.4SIST EN 301 484-1 V1.1.1:2005
ETSIETSIEN301484-1V1.1.1(2000-04)8Primaryrateaccess:seeITU-TRecommendationI.112[5],subclause2.4,definition426Sequentialhunting:selectionofafreeaccessalwaysstartswiththesameaccessandthenfollowsafixedorderuntilallaccessesinthehuntgrouphavebeensearchedorafreeaccessisfoundServeduser:usertowhomtheLHserviceisprovidedService;telecommunicationsservice:seeITU-TRecommendationI.112[5],subclause2.2,definition201Supplementaryservice:seeITU-TRecommendationI.210[6],subclause2.4User:DSS1protocolentityattheusersideoftheuser-networkinterfacewhenacoincidentSandTreferencepointappliesUserdetermineduserbusy:seeITU-TRecommendationI.221[14],subclause2.1.44AbbreviationsForthepurposeofthepresentdocument,thefollowingabbreviationsapply:HGHuntGroupISDNIntegratedServicesDigitalNetworkLHLineHuntingLHGLineHuntGroup5DescriptionTheLHsupplementaryserviceisintendedforuseonaccessestowhichterminalsareconnectedattheS/Treferencepoint.TheLHsupplementaryserviceenablescallstoanISDNnumber(i.e.thehuntgroupnumber)tobeofferedtoafreeaccessinahuntgroup.Thehuntgroupcancomprisebasicaccesses,primaryrateaccesses(asanetworkoption),oramixtureofthesetypesofaccesses.TheLHsupplementaryserviceappliestoaccesseswithinahuntgroupthatareconnectedtothesameexchange.AsanetworkoptiontheLHsupplementaryservicecanbeusedtocreateamulti-nodalservicethatallowslinehuntingacrossaccessesonmultipleexchanges.Thespecificationofthemulti-nodalserviceisoutsidethescopeofthepresentdocument,howeverannexAofEN301479[1]considerssomeoftheimplicationsofthisservice.Callsmadetoanindividualnumber(seenote1)maybeofferedonthecorrespondingaccesswithoutbeingsubjecttohuntingprocedures(channelhuntingmaybeperformedwithintheaccessitself).NOTE1:Theindividualaccessesthataremembersofthehuntgroupcanalsohaveindividualnumbers(e.g.,withthemultiplesubscribernumbersupplementaryservice)allocated.Itistheuser'sresponsibilitytoensurecompatibilityoftheequipmentconnectedtoanaccessinahu
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