SIST EN 300 356-21 V4.2.1:2004

• Abstract:

  To specify the ISUP V4 specific enhancements for the supplementary service Anonymous Call Rejection (ACR)

• Status: Published
• Publication Date: 31-Mar-2004
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2004
• Due Date: 01-Apr-2004
• Completion Date: 01-Apr-2004
• Ref Project: ETSI EN 300 356-21 V4.2.1 (2001-07) - Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 21: Anonymous Call Rejection (ACR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993)]

SIST EN 300 356-21 V4.2.1:2004 is the Slovenian adoption of ETSI EN 300 356-21 for the Integrated Services Digital Network (ISDN) international interface. It specifies the stage 3 signalling procedures and switching functions for the Anonymous Call Rejection (ACR) supplementary service over Signalling System No. 7 (SS7), for network operators, switch vendors, and others who implement or interconnect ISDN services.

What does SIST EN 300 356-21 V4.2.1:2004 specify?

SIST EN 300 356-21 V4.2.1:2004 specifies the stage 3 of ACR for pan-European ISDN using SS7 and the ISDN User Part (ISUP). In practice, it tells implementers how the network should signal and handle anonymous incoming calls so that the called user can reject them consistently.

The scope is limited to the international interface. The standard does not cover the extra protocol requirements for delivery through a non-ISDN network or for the national signalling interface. It also keeps some functions, message formats, and codes that are marked for national use as informative for the international specification.

The document is organized into scope, references, definitions and abbreviations, description, provision and withdrawal, coding requirements, state definitions, signalling procedures, interaction with other networks, and interaction with other supplementary services.

What are the key requirements of SIST EN 300 356-21 V4.2.1:2004?

SIST EN 300 356-21 V4.2.1:2004 focuses on how ACR behaves in call setup, how it is coded, and how it interacts with other networks and services. The main practical points are below.

• Clause 4 - Service behavior: ACR allows the served user to reject incoming calls from users or subscribers whose identity is restricted under Calling Line Identification Restriction (CLIR). This matters because the network must recognize anonymous calls and return a clear rejection behavior to the caller.
• Clause 4 - User indication: the calling user is to receive an appropriate indication explaining that the call was rejected because of ACR. In practice, this means the caller should not just see a generic failure.
• Clause 5 - Provision and withdrawal: when ACR is implemented as a network-based solution, it is provided only after prior arrangement with the service provider and withdrawn on the served user’s request or for administrative reasons. That gives operators a defined service-management process.
• Clause 6 - Coding requirements: ACR uses the Address Presentation Restriction Indicator (APRI) field in the calling party number parameter and the cause value 24, “call rejected due to ACR supplementary service.” Implementers need to map the right signaling data to the right rejection cause.
• Clause 8 - Signalling procedures: normal ISUP basic call procedures apply, but if ACR is active the service rejects calls whose Calling Line Identification (CLI) is marked “presentation restricted” under CLIR. The served user’s ability to originate calls is unaffected, so the service only changes inbound call handling.
• Clause 8 - Rejection methods: the caller can be informed by a Release message, by an Address Complete or Call Progress message with cause value 24 and an in-band announcement, or by forwarding to a voice message service. This gives operators multiple implementation options for how the rejection is presented.
• Clause 9 - Interworking: when calls cross non-ISDN, existing ISDN, or private networks, the distinction between “presentation restricted” and “presentation restricted by network” is important. This matters because poor interworking can cause unintended rejections or loss of the ACR cause information.
• Clause 10 - Other supplementary services: interaction with other supplementary services follows the ACR service description. That means ACR implementation should be checked together with related service behavior, not in isolation.

What terms does SIST EN 300 356-21 V4.2.1:2004 define?

SIST EN 300 356-21 V4.2.1:2004 defines one specific term and uses several key abbreviations.

• Served user: the user to whom the ACR supplementary service is provided.
• ACR (Anonymous Call Rejection): the supplementary service that rejects incoming calls from callers whose identity is not presented.
• APRI (Address Presentation Restriction Indicator): the indicator in the calling party number that shows whether the address may be presented.
• CLI (Calling Line Identification): the caller identity information used by the service logic.
• CLIP (Calling Line Identification Presentation): the supplementary service for presenting caller identity.
• CLIR (Calling Line Identification Restriction): the supplementary service for restricting caller identity presentation.
• ISDN (Integrated Services Digital Network): the network environment to which this specification applies.
• ISUP (ISDN User Part): the SS7 protocol part used for ISDN call signalling.

Who uses SIST EN 300 356-21 V4.2.1:2004?

SIST EN 300 356-21 V4.2.1:2004 is used by public telecommunications operators, network engineers, switch and gateway vendors, and interoperability test teams. It is also relevant for terminal manufacturers when ACR is implemented as a user-based solution.

In practice, these users apply the standard when configuring call rejection behavior, mapping cause codes, testing interworking with other networks, and checking how ACR interacts with CLIP and CLIR handling.

What changed in SIST EN 300 356-21 V4.2.1:2004 from the previous edition?

The document history lists an earlier V4.1.1 edition from September 2000 and this V4.2.1 edition published in 2001. The page also records the public enquiry and vote milestones for V4.2.1.

Which standards are used with SIST EN 300 356-21 V4.2.1:2004?

Reference	What it contributes
ITU-T Recommendation I.130	Method for characterizing telecommunications services and network capabilities.
Directive 97/66/EC	Privacy and personal-data basis for the ACR service context.
ETSI EN 301 798	ACR service description and stage 1 service aspects.
ETSI EN 300 356-1	Basic ISUP procedures and messages used by ACR.
ETSI EN 300 356-3	CLIP service behavior and APRI handling.
ETSI EN 300 356-4	CLIR service behavior and restricted presentation handling.
ETSI EN 300 485	Cause coding, including cause value 24.
ETSI EN 300 089	CLIP service description and extended screening context.

The foreword also places this part within the EN 300 356 series, alongside the basic-services and test-specification parts for supplementary services.

What does the SIST EN 300 356-21 V4.2.1:2004 document contain?

SIST EN 300 356-21 V4.2.1:2004 contains the service description, provisioning rules, coding rules, signalling behavior, and interworking notes needed to implement ACR on ISDN/SS7. It does not read like a tutorial; it is a protocol specification for engineering and conformance work.

For implementers, the most useful material is the handling of APRI, the use of cause value 24, and the allowed ways to reject an anonymous call. For operators and testers, the interworking clauses show what to verify when calls cross non-ISDN, existing ISDN, and private networks.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 21: Anonymous Call Rejection (ACR) supplementary service [ITU-T Recommendation Q.731, clause 4 (1993)]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 356-21 Version 4.2.1SIST EN 300 356-21 V4.2.1:2004en01-april-2004SIST EN 300 356-21 V4.2.1:2004SLOVENSKI
STANDARD
ETSIEN300356-21V4.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);SignallingSystemNo.7(SS7);ISDNUserPart(ISUP)version4fortheinternationalinterface;Part21:AnonymousCallRejection(ACR)supplementaryservice[ITU-TRecommendationQ.731,clause4(1993)]SIST EN 300 356-21 V4.2.1:2004

ETSIETSIEN300356-21V4.2.1(2001-07)2ReferenceDEN/SPAN-01082-21KeywordsISDN,ISUP,SS7,supplementaryservice,endorsementETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 356-21 V4.2.1:2004

ETSIETSIEN300356-21V4.2.1(2001-07)3ContentsIntellectualPropertyRights.4Foreword.41Scope.62References.73Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.84Description.85Provisionandwithdrawal.86Codingrequirements.87Statedefinitions.88Signallingprocedures.99Interactionwithothernetworks.99.1Interworkingwithnon-ISDNnetworks.99.2InterworkingwithexistingISDNnetworks.99.3InterworkingwithPrivateNetworks.910Interactionwithothersupplementaryservices.9History.10SIST EN 300 356-21 V4.2.1:2004

ETSIETSIEN300356-21V4.2.1(2001-07)4IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.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).Thepresentdocumentispart21ofamulti-partdeliverablecoveringtheISDNUserPart(ISUP)version4fortheinternationalinterface,asidentifiedbelow:Part1:"Basicservices[ITU-TRecommendationsQ.761toQ.764(1999)modified]";Part2:"ISDNsupplementaryservice[ITU-TRecommendationQ.730(1999)modified]";Part3:"CallingLineIdentificationPresentation(CLIP)supplementaryservice[ITU-TRecommendationQ.731,clause3(1993)modified]";Part4:"CallingLineIdentificationRestriction(CLIR)supplementaryservice[ITU-TRecommendationQ.731,clause4(1993)modified]";Part5:"ConnectedLineIdentificationPresentation(COLP)supplementaryservice[ITU-TRecommendationQ.731,clause5(1993)modified]";Part6:"ConnectedLineIdentificationRestriction(COLR)supplementaryservice[ITU-TRecommendationQ.731,clause6(1993)modified]";Part7:"TerminalPortability(TP)supplementaryservice[ITU-TRecommendationQ.733,clause4(1993)modified]";Part8:"User-to-UserSignalling(UUS)supplementaryservice[ITU-TRecommendationQ.737,clause1(1997)modified]";Part9:"ClosedUserGroup(CUG)supplementaryservice[ITU-TRecommendationQ.735,clause1(1993)modified]";Part10:"Subaddressing(SUB)supplementaryservice[ITU-TRecommendationQ.731,clause8(1992)modified]";Part11:"MaliciousCallIdentification(MCID)supplementaryservice[ITU-TRecommendationQ.731,clause7(1997)modified]";Part12:"ConferenceCall,add-on(CONF)supplementaryservice[ITU-TRecommendationQ.734,clause1(1993)andimplementorsguide(1998)modified]";Part14:"ExplicitCallTransfer(ECT)supplementaryservice[ITU-TRecommendationQ.732,clause7(1996)andimplementorsguide(1998)modified]";Part15:"Diversionsupplementaryservice[ITU-TRecommendationQ.732,clauses2to5(1999)modified]";Part16:"CallHold(HOLD)supplementaryservice[ITU-TRecommendationQ.733,clause2(1993)modified]";Part17:"CallWaiting(CW)supplementaryservice[ITU-TRecommendationQ.733,clause1(1992)modified]";SIST EN 300 356-21 V4.2.1:2004

ETSIETSIEN300356-21V4.2.1(2001-07)5Part18:"CompletionofCallstoBusySubscriber(CCBS)supplementaryservice[ITU-TRecommendationQ.733,clause3(1997)modified]";Part19:"Three-Party(3PTY)supplementaryservice[ITU-TRecommendationQ.734,clause2(1996)andimplementorsguide(1998)modified]";Part20:"CompletionofCallsonNoReply(CCNR)supplementaryservice[ITU-TRecommendationQ.733,clause5(1999)modified]";Part21:"AnonymousCallRejection(ACR)supplementaryservice[ITU-TRecommendationQ.731,clause4(1993)]";Part31:"ProtocolImplementationConformanceStatement(PICS)proformaspecificationforbasicservices";Part32:"TestSuiteStructureandTestPurposes(TSS&TP)specificationforbasicservices";Part33:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforbasicservices";Part34:"ProtocolImplementationConformanceStatement(PICS)proformaspecificationforsupplementaryservices";Part35:"TestSuiteStructureandTestPurposes(TSS&TP)specificationforsupplementaryservices";Part36:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforsupplementaryservices".InaccordancewithITU-TRecommendationI.130[1],thefollowingthreelevelstructureisusedtodescribethesupplementarytelecommunicationservicesasprovidedbyEuropeanpublictelecommunicationsoperatorsunderthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN):-Stage1:isanoverallservicedescription,fromtheuser'sstand-point;-Stage2:identifiesthefunctionalcapabilitiesandinformationflowsneededtosupporttheservicedescribedinstage1;and-Stage3:definesthesignallingsystemprotocolsandswitchingfunctionsneededtoimplementtheservicedescribedinstage1.Thepresentdocumentdetailsthestagethreeaspects(signallingsystemprotocolsandswitchingfunctions)neededtosupporttheAnonymousCallRejection(ACR)supplementaryservice.Thestage1aspectsaredetailedinEN301798[3].Nostage2descriptionisprovided.NationaltranspositiondatesDateofadoptionofthisEN:13July2001DateoflatestannouncementofthisEN(doa):31October2001Date
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