SIST EN 300 357 V1.2.1:2005
(Main)Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Service description
General Information
- Abstract
Update of the interaction between the CCBS and Call Forwarding No Reply (CFNR) and between the CCBS and Call Forwarding Busy (CFB) supplementary services.
- 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 300 357 V1.2.1:2005 specifies the service description for the Completion of Calls to Busy Subscriber (CCBS) supplementary service within the Integrated Services Digital Network (ISDN) environment. Developed by SIST, this standard aligns with EN 300 357 (ETSI) and addresses how CCBS interacts with other supplementary services, specifically Call Forwarding No Reply (CFNR) and Call Forwarding Busy (CFB).
The CCBS supplementary service offers subscribers an enhanced calling experience by allowing automatic call completion when the initially called party is busy, eliminating the need to repeatedly redial. The document provides requirements for both public and private ISDN networks and outlines the service's applicability, limitations, and operational interactions with other ISDN features.
Key Topics
- CCBS Service Description: Details how CCBS enables a caller (User A) to request automatic completion once the called party (User B) becomes available after being busy.
- Service Application: Applicable to all ISDN circuit-switched services except particular video telephony and multi-B channel operations.
- Activation and Deactivation: Procedures for service activation after a call encounters a busy signal, along with deactivation by user request or automatically upon certain conditions.
- Interworking and Compatibility: Requirements for interworking between public and private ISDNs, as well as with non-ISDN networks, ensuring the CCBS feature operates reliably across interconnected environments.
- Service Interactions: Updates the manner in which CCBS interacts with supplementary services like Call Forwarding No Reply (CFNR) and Call Forwarding Busy (CFB), crucial for maintaining seamless telecommunications service.
- Procedural Timers and Limits: Specifies timers (e.g., recall and service duration) and queue limits for effective management of outstanding CCBS requests.
- User Experience: Ensures that users receive clear notifications for activation, successful call completion, denials, or any conflicts due to service or network conditions.
Applications
The CCBS supplementary service is widely used in public and enterprise ISDN deployments to enhance user efficiency and satisfaction by:
- Improving call completion rates: Users don’t need to manually redial busy numbers, reducing missed communications and frustration.
- Supporting business continuity: Key in PBX and large organization settings, where timely call completion is essential.
- Maximizing network efficiency: Automated call handling minimizes unnecessary signaling and manual intervention.
- Integrating with advanced call handling: The CCBS feature adapts to complex call routing scenarios, maintaining compatibility with call forwarding and waiting services.
- Enabling efficient resource utilization: Timers and limits ensure that network resources are allocated judiciously without overload or queue saturation.
CCBS is particularly valuable in customer service centers, large corporations, and any organization relying on ISDN infrastructure for critical communications.
Related Standards
Understanding the context of SIST EN 300 357 V1.2.1:2005 is enhanced by familiarity with related international and European standards:
- EN 300 358: Functional capabilities and information flows for CCBS (Stage 2 specification).
- EN 300 359-1: Protocol specification for CCBS using Digital Subscriber Signalling System No.1 (DSS1).
- EN 300 356-18: ISDN User Part (ISUP) signaling for CCBS supplementary service.
- ITU-T Recommendation I.130: Structure for telecommunication service descriptions.
- ITU-T Recommendation E.164: International public telecommunication numbering plan.
- Base ISDN standards: Including terminology and service principles critical for full understanding of ISDN supplementary services.
SIST EN 300 357 V1.2.1:2005 provides a foundational, user-focused description essential for network operators, equipment manufacturers, and service integrators implementing reliable and interoperable CCBS services within ISDN networks. Adhering to this standard supports seamless communication and optimal service performance across complex ISDN environments.
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Frequently Asked Questions
SIST EN 300 357 V1.2.1:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Service description". This standard covers: Update of the interaction between the CCBS and Call Forwarding No Reply (CFNR) and between the CCBS and Call Forwarding Busy (CFB) supplementary services.
Update of the interaction between the CCBS and Call Forwarding No Reply (CFNR) and between the CCBS and Call Forwarding Busy (CFB) supplementary services.
SIST EN 300 357 V1.2.1:2005 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 300 357 V1.2.1:2005 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.VWRULWHYIntegrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Service description33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 357 Version 1.2.1SIST EN 300 357 V1.2.1:2005en01-januar-2005SIST EN 300 357 V1.2.1:2005SLOVENSKI
STANDARD
ETSIEN300357V1.2.1(2001-05)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);CompletionofCallstoBusySubscriber(CCBS)supplementaryservice;ServicedescriptionSIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)2ReferenceREN/SPAN-110096KeywordsCCBS,ISDN,stage1,supplementaryserviceETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°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:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.84Description.85Procedures.85.1Provisionandwithdrawal.85.2Normalprocedures.95.2.1Registrationanderasure.95.2.2Activationanddeactivation.95.2.2.1Activation.95.2.2.2Deactivation.105.2.3Invocationandoperation.105.2.4Interrogation.115.3Exceptionalprocedures.115.3.1Registrationanderasure.115.3.2Activationanddeactivation.115.3.2.1Activation.115.3.2.2Deactivation.125.3.3Invocationandoperation.125.3.3.1ExceptionalsituationatdestinationB'sside.125.3.3.2ExceptionalsituationatuserA'sside.135.3.3.3Networkcongestion.135.3.4Interrogation.136Intercommunicationconsiderations.146.1Interworkingwithnon-ISDNs.146.2InterworkingwithprivateISDNs.147Interactionwithothersupplementaryservices.147.1Adviceofchargeservices.147.1.1Charginginformationatcallset-uptime.147.1.2Charginginformationduringthecall.147.1.3Charginginformationattheendofacall.147.2Callwaiting.157.3Callhold.157.4Explicitcalltransfer.157.5Numberidentificationservices.157.5.1Callinglineidentificationpresentation.157.5.2Callinglineidentificationrestriction.157.5.3Connectedlineidentificationpresentation.157.5.4Connectedlineidentificationrestriction.157.6Closedusergroup.157.7Completionofcallstobusysubscriber.167.8Conferenceservices.167.8.1Conferencecall,add-on.167.8.2Meet-meconference.167.9Directdiallingin.167.10Diversionservices.167.10.1Callforwardingunconditional.167.10.2Callforwardingbusy.17SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)47.10.3Callforwardingnoreply.177.10.4Calldeflection.187.11Freephone.187.12Maliciouscallidentification.187.13Multiplesubscribernumber.187.14Subaddressing.187.15Terminalportability.187.16Threeparty.187.17User-to-usersignalling.19AnnexA(normative):Determinationoftheexistenceofcompatibleterminals.20AnnexB(informative):Bibliography.21History.22SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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)hasbeenproducedbyETSITechnicalCommitteeServicesandProtocolsforAdvancedNetworks(SPAN).InaccordancewithITU-TRecommendationI.130[1],thefollowingthreelevelstructureisusedtodescribethesupplementarytelecommunicationsservicesasprovidedbyEuropeanpublictelecommunicationsoperatorsunderthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN):-Stage1:isanoverallservicedescription,fromtheuser'sstandpoint;-Stage2:identifiesthefunctionalcapabilitiesandinformationflowsneededtosupporttheservicedescribedinstage1;and-Stage3:definesthesignallingsystemprotocolsandswitchingfunctionsneededtoimplementtheservicedescribedinstage1.Thepresentdocumentdetailsthestage1aspects(overallservicedescription)fortheCompletionofCallstoBusySubscriber(CCBS)supplementaryservice.Thestage2aspectsaredetailedinETS300358(seebibliography)andthestage3aspectsaredetailedinEN300359-1[7]andEN300356-18[8].NationaltranspositiondatesDateofadoptionofthisEN:25May2001DateoflatestannouncementofthisEN(doa):31August2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):28February2002DateofwithdrawalofanyconflictingNationalStandard(dow):28February2002SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)61ScopeThepresentdocumentdefinesthestageoneoftheCompletionofCallstoBusySubscriber(CCBS)supplementaryserviceforthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN)asprovidedbyEuropeanpublictelecommunicationsoperators.Stageoneisanoverallservicedescriptionfromtheuser'spointofview(seeITU-TRecommendationI.130[1]),butdoesnotdealwiththedetailsofthehumaninterfaceitself.ThepresentdocumentdefinestheinterworkingrequirementsofprivateISDNswiththepublicISDN.Inaddition,thepresentdocumentspecifiesthebasefunctionalitywheretheserviceisprovidedtotheuserviaaprivateISDN.ThepresentdocumentdoesnotspecifytheadditionalrequirementswheretheserviceisprovidedtotheuserviaatelecommunicationsnetworkthatisnotanISDNbutdoesincludeinterworkingrequirementsofothernetworkswiththepublicISDN.Interactionswithsupplementaryservicesnotlistedinclause7areoutsidethescopeofthepresentdocument.Chargingprinciplesareoutsidethescopeofthepresentdocument.TheCCBSsupplementaryserviceenablesuserA,encounteringabusydestinationB,tohavethecallcompletedwithouthavingtomakeanewcallattemptwhenthedestinationBbecomesnotbusy.TheCCBSsupplementaryserviceisapplicabletoallcircuit-switchedtelecommunicationsserviceswiththefollowingexceptions:a)call2,ofthevideotelephonyteleservice(seeETS300264inbibliography);b)allothercircuit-switchedtelecommunicationsservicesrequiringtheuseofmorethanoneB-channel.ThepresentdocumentisapplicabletothestagetwoandstagethreedocumentsfortheISDNCCBSsupplementaryservice.Theterms"stagetwo"and"stagethree"arealsodefinedinITU-TRecommendationI.130[1].Wherethetextindicatesthestatusofarequirement(i.e.asstrictcommandorprohibition,asauthorizationleavingfreedom,orasacapabilityorpossibility),thisshallbereflectedinthetextoftherelevantstagetwoandstagethreedocuments.Furthermore,conformancetothepresentdocumentismetbyconformingtothestagethreedocumentwiththefieldofapplicationappropriatetotheequipmentbeingimplemented.Therefore,nomethodoftestingisprovidedforthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,subsequentrevisionsdoapply.[1]ITU-TRecommendationI.130(1988):"MethodforthecharacterizationoftelecommunicationservicessupportedbyanISDNandnetworkcapabilitiesofanISDN".[2]ITU-TRecommendationI.112(1988):"VocabularyoftermsforISDNs".[3]ITU-TRecommendationI.210(1993):"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".[4]ITU-TRecommendationE.164(1997):"Theinternationalpublictelecommunicationnumberingplan".SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)7[5]ITU-TRecommendationQ.9(1988):"Vocabularyofswitchingandsignallingterms".[6]ITU-TRecommendationI.221(1993):"Commonspecificcharacteristicsofservices".[7]ETSIEN300359-1(V1.3.2):"IntegratedServicesDigitalNetwork(ISDN);CompletionofCallstoBusySubscriber(CCBS)supplementaryservice;DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Part1:Protocolspecification".[8]ETSIEN300356-18(V3.1.3):"IntegratedServicesDigitalNetwork(ISDN);SignallingSystemNo.7;ISDNUserPart(ISUP)version3fortheinternationalinterface;Part18:CompletionofCallstoBusySubscriber(CCBS)supplementaryservice[ITU-TRecommendationQ.733,clause3(1997),modified]".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:basicaccess:seeITU-TRecommendationQ.9[5],clause1,definition1551basiccallprocedures:proceduresbywhichacall(asaninstanceofatelecommunicationsservice)isestablishedandterminatedbusy:seeITU-TRecommendationI.221[6],clause3.CCBSbusy:anyoneofthefollowingconditionswillcauseuserAtobeconsideredasCCBSbusy:-maximumnumberofcallsreachedatuserA;-noB-channelsavailableatuserA;-CCBSrecallpendingonuserA.CCBScall:callgeneratedbythenetworkfromuserAtodestinationBresultingfromuserA'sacceptanceofaCCBSrecallCCBSrecall:indicationinforminguserAthatthenetworkisreadytoinitiateaCCBScalltodestinationBandthatthenetworkisawaitingaresponsetothisindicationCCBSrecalltimer:maximumtimethenetworkwillwaitforuserAtorespondtoaCCBSrecall.Thevalueofthistimershallbeaminimumof10secondsandamaximumof20secondsCCBSrequest:instanceofanactivationoftheCCBSsupplementaryservicewhichisheldinaqueuependingthecorrectconditionsfortheCCBSsupplementaryservicetobecompletedCCBSservicedurationtimer:maximumtimetheCCBSsupplementaryservicewillremainactivatedforuserAwithinthenetwork.Thevalueofthistimershallbeaminimumof15minutesandamaximumof45minutescompatibleterminal:terminalwhichcansupportthebearerserviceorteleservicerequestedfortheoriginalcalltodestinationBandwhichcanacceptcallstotheISDNnumberandsubaddressidentifyingthecalleduserintheoriginalcalltodestinationBdestinationB:entityaddressedintheoriginalcalldestinationBidleguardtimer:timethenetworkwillwaitafterdestinationBhasbecomenotbusybeforeinforminguserA.Thevalueofthistimershallbeamaximumof15secondsIntegratedServicesDigitalNetwork(ISDN):seeITU-TRecommendationI.112[2],clause2.3,definition308ISDNnumber:numberconformingtothenumberingplanandstructurespecifiedinITU-TRecommendationE.164[4]primaryrateaccess:seeITU-TRecommendationQ.9[5],clause1,definition1552SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)8retentiontimer:thistimerspecifiestheamountoftimethatthenetworkretainsalloftheinformationsuppliedbythecallinguserwhenthecallencountersbusy.Thistimerispartofthebasiccallprocedures.Althoughthistimerisoptionalforthebasiccallprocedures,itisneededfortheoperationoftheCCBSsupplementaryservice.Thevalueshallbegreaterthan15secondsservice;telecommunicationsservice:seeITU-TRecommendationI.112[2],clause2.2,definition201subaddress:seeITU-TRecommendationE.164[4],clause11.2supplementaryservice:seeITU-TRecommendationI.210[3],clause2.4suspendedCCBSrequest:CCBSrequestwhichcannotbeservedevenifdestinationBisnotbusy,becauseuserAisbusyorCCBSbusyuserA:userwhooriginatedthecallandtowhomtheCCBSsupplementaryserviceisprovided3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:CCBSCompletionofCallstoBusySubscriberISDNIntegratedServicesDigitalNetwork4DescriptionTheCCBSsupplementaryserviceenablesuserA,encounteringabusydestinationB,tohavethecallcompletedwithouthavingtomakeanewcallattemptwhenthedestinationBbecomesnotbusy.WhenuserArequeststheCCBSsupplementaryservice,thenetworkwillmonitorfordestinationBbecomingnotbusy.WhendestinationBbecomesnotbusy(i.e.accessresources,e.g.atleastoneB-channel,arenotbusy)thenthenetworkwillwaitashorttimeinordertoallowtheresourcestobere-usedfororiginatingacall.Iftheresourcesarenotre-usedbydestinationBwithinthistime,thenthenetworkwillautomaticallyrecalluserA.WhenuserAacceptstheCCBSrecall,thenthenetworkwillautomaticallygenerateaCCBScalltodestinationB.TheCCBSsupplementaryserviceshallbeavailabletouserswhoareconnectedtothenetworkviaabasicaccessoraprimaryrateaccess.NOTE:AsupplementaryserviceprovidedtodestinationBwhichpreventstheregistrationofCCBSrequestsisoutsidethescopeofthepresentdocument.5Procedures5.1ProvisionandwithdrawalTheCCBSsupplementaryserviceshallbeprovidedtouserAafterpriorarrangementwiththeserviceproviderorshallbegenerallyavailable.TheCCBSsupplementaryserviceshallbewithdrawnbytheserviceprovideruponrequestofthesubscriberorforserviceproviderreasons.Asaserviceprovideroption,theCCBSsupplementaryservicecanbeofferedwithasubscriptionoption,whichshallapplytothewholeaccessofuserA.Thesubscriptionoptionisdetailedintable1.SIST EN 300 357 V1.2.1:2005
ETSIETSIEN300357V1.2.1(2001-05)9Table1SubscriptionoptionValuesRecallmode-Global,i.e.CCBSrecallofferedtoallterminals.-Specific,i.e.CCBSrecallofferedtotheterminal,whichactivatedtheCCBSsupplementaryservice.Ifthesubscriptionoptionisnotoffered,oneofthetwovaluesshallbechosenbytheserviceprovider.5.2Normalprocedures5.2.1RegistrationanderasureNotapplicable.5.2.2Activationanddeactivation5.2.2.1ActivationWhenthenetworkencountersabusydestinationB,itshallretainthecallinformationfortheCCBSsupplementaryservicefortheperioddefinedbytheretentiontimer.DuringthistimeuserAcanactivatetheCCBSsupplementaryservice.Thevalueoftheretentiontimershallbeaminimumof15seconds.UponreceiptofarequestfortheactivationoftheCCBSsupplementaryservicethenetworkshallcheckthatacompatibleterminalexistsatdestinationB(seeannexA).WhenithasbeenestablishedthatacompatibleterminalexistsatdestinationB,thenetworkshallregistertheCCBSrequestbasedontheretainedcallinformationanduserAshallbeinformedthattheactivationwassuccessful.MultiplerequestsagainstdestinationBshallbequeued.WhentheactivationoftheCCBSsupplementaryserviceisacceptedtheCCBSservicedurationtimershallbestarted.Thevalueofthistimershallbeaminimumof15minutesandamaximumof45minutes.ThenetworkshallmonitorfordestinationBbecomingnotbusy.UserAcanhavealimitednumberofCCBSrequestsoutstanding.Thislimitshallapplyingeneralforallusersanditsvalueshallbeanetworkprovideroptionwithamaximumvalueof5.Therequestscanbetodifferentdestinations,orcanbetothesamedestinationBwithdifferentservicerequirements(e.g.bearerserviceandteleservicerequirements),orasanetworkoption,thesameservicerequirements.DestinationBcanhavealimitednumberofincomingCCBSrequestsoutstanding.Thislimitshallapplyingeneralforallusersanditsvalueshallbeadestinationnetworkoptionwithamaximumvalueof5.Asafurtherdestinationnetworkoption,thesizeofthedestinationBCCBSqueuecanbereducedforindividualusers.Thereducedsizecanhavezerolength.NOTE1:ReducingthequeuelengthallowsanetworkoperatortobalancetheinteractionbetweentheCCBSsupplementaryserviceandothersupplementaryservices(e.g.thecallwaitingsupplementaryserviceandthefreephonesupplementaryservice).NOTE2:Asaconsequenceofthequeuehavingzerolength,theCCBSsupplementaryservicewillbeunavailabletouserscallingdestinationB.HavingactivatedtheCCBSsupplementaryservice,userAcanoriginatecallsandreceivecallsasnormal.SIST EN 30
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