SIST EN 301 491-1 V1.1.2:2005
(Main)Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service; Part 1: Test Suite Structure and Test Purposes (TSS&TP) specification
General Information
- Abstract
TSS&TP for Call offer.
- 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
- Mandate
- T-326
Overview
SIST EN 301 491-1 V1.1.2:2005 defines the Test Suite Structure and Test Purposes (TSS&TP) for the Call Offer (CO) supplementary service within the inter-exchange signalling protocol for Private Integrated Services Networks (PISN). This standard is critical for ensuring the interoperability and conformance of network equipment supporting the Call Offer supplementary service, commonly used in enterprise telephony and virtual private network (VPN) applications. The specification aligns with general international testing methodologies, referencing ISO/IEC 9646 standards, and provides a rigorous framework for validating correct CO service implementation.
Key Topics
Test Suite Structure (TSS):
- Defines the logical organization of test cases for the Call Offer service.
- Categorizes procedures for both originating and terminating network exchanges (PINX), covering different call scenarios (with and without path retention).
- Includes structured grouping for interactions with other supplementary services.
Test Purposes (TP):
- Detailed objectives for each test scenario, ensuring comprehensive coverage of expected behaviors.
- Standardized naming and structure for clarity and ease of use.
- Focuses on externally observable behavior of the Implementation Under Test (IUT).
Conformance and Interoperability:
- Testing aims to assure higher probability of seamless interoperability in multi-vendor PISN environments.
- Emphasizes conformance at the “b” service entry point for VPN scenarios.
Supplementary Service Interactions:
- Addresses interactions between Call Offer and related features such as Call Transfer, Call Forwarding (Unconditional and Busy), Do Not Disturb Override, and Call Intrusion.
- Ensures that CO functionality remains robust in complex service combinations.
Applications
The application of SIST EN 301 491-1 offers substantial value across multiple domains in telecommunication networks, especially within private and enterprise environments:
Equipment Manufacturers:
- Use this standard to develop and validate PISN equipment, ensuring compliance with European and international expectations for interoperability.
- Enables systematic testing during product development to meet regulatory and business requirements.
Network Operators and Service Providers:
- Verify the compatibility and correct behavior of devices and services in their PISN deployments.
- Supports reliable deployment of supplementary services in enterprise VPNs and advanced telephony environments.
Test Laboratories:
- Adopt the TSS&TP structure to design, implement, and conduct conformance testing for PISN inter-exchange signalling protocols.
- Provide certification and assurance for equipment before market release or integration.
Enterprises with Private Networks:
- Ensure their communication infrastructure supports advanced telephony features with proven interoperability.
- Reduce risk of service failure when integrating multi-vendor PBX systems and network services.
Related Standards
- EN 300 362: Details the Call Offer supplementary service procedures used as the foundation for the current TSS&TP specification.
- ISO/IEC 9646 (Parts 1, 2, 3): Defines international methodologies for protocol conformance testing and Abstract Test Suite (ATS) development.
- ETSI EN 301 060-1: Provides specifications for VPN enhancements at the PISN "b" service entry point.
- ETR 172: Covers business telecommunication virtual private networking, including service, networking, and standardization requirements.
- ETS 300 239: Describes the generic functional protocol for PISN supplementary services.
- ITU-T Recommendations I.112 and I.210: Offer terminology and descriptions for ISDN and telecommunication services.
Keywords: PISN, Call Offer, supplementary service, inter-exchange signalling, testing, TSS&TP, test suite, protocol conformance, VPN, enterprise telephony, interoperability, telecommunications standard.
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Frequently Asked Questions
SIST EN 301 491-1 V1.1.2:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service; Part 1: Test Suite Structure and Test Purposes (TSS&TP) specification". This standard covers: TSS&TP for Call offer.
TSS&TP for Call offer.
SIST EN 301 491-1 V1.1.2:2005 is classified under the following ICS (International Classification for Standards) categories: 33.040.35 - Telephone networks. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 491-1 V1.1.2:2005 is associated with the following European legislation: Standardization Mandates: T-326. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 301 491-1 V1.1.2:2005 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.Zasebno omrežje z integriranimi storitvami (PISN) – Signalizacijski protokol med centralami – Dopolnilna storitev: ponudba klica – 1. del: Zgradba preskušalnega niza in namen preskušanja (TSS&TP) – SpecifikacijaPrivate Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service; Part 1: Test Suite Structure and Test Purposes (TSS&TP) specification33.040.35Telefonska omrežjaTelephone networksICS:Ta slovenski standard je istoveten z:EN 301 491-1 Version 1.1.2SIST EN 301 491-1 V1.1.2:2005en01-januar-2005SIST EN 301 491-1 V1.1.2:2005SLOVENSKI
STANDARD
ETSIEN301491-1V1.1.2(2000-11)EuropeanStandard(Telecommunicationsseries)PrivateIntegratedServicesNetwork(PISN);Inter-exchangesignallingprotocol;Calloffersupplementaryservice;Part1:TestSuiteStructureandTestPurposes(TSS&TP)specificationSIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)2ReferenceDEN/SPAN-05191-2KeywordsPISN,supplementaryservice,testing,TSS&TP,QSIGETSI650RoutedesLuciolesF-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.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)3ContentsIntellectualPropertyRights.4Foreword.41Scope.52References.53Definitionsandabbreviations.63.1Definitions.63.2Abbreviations.64TestSuiteStructure(TSS).75TestPurposes(TP).85.1Introduction.85.1.1TPnamingconvention.85.1.2SourceofTPdefinition.85.1.3TPstructure.95.1.4Teststrategy.95.2TPsforCO.95.2.1SS-COsignallingprocedures.105.2.1.1ActionsattheOriginatingPINX.105.2.1.1.1SendingCORequestwithoutPathRetention.105.2.1.1.2SendingCORequestwithPathRetention.115.2.1.2ActionsattheTerminatingPINX.125.2.1.2.1ReceiptCOrequestwithoutPathRetention.125.2.1.2.2ReceiptCOrequestwithPathRetention.125.2.2ImpactofInterworkingwithPublicISDNs.135.2.3ProtocolInteractionbetweenSS-COandotherSupplementaryServicesandANFs.135.2.3.1InteractionwithCallTransfer.135.2.3.1.1ActionsattheCO-OriginatingPINX.135.2.3.1.2ActionsattheCO-TerminatingPINX.135.2.3.2InteractionwithCallForwardingUnconditional.145.2.3.2.1ActionsattheCO-OriginatingPINX.145.2.3.2.2ActionsattheCO-TerminatingPINX.155.2.3.3InteractionwithCallForwardingBusy.155.2.3.3.1ActionsattheCO-OriginatingPINX.155.2.3.3.2ActionsattheCO-TerminatingPINX.165.2.3.4InteractionwithDoNotDisturbOverride.185.2.3.4.1ActionsattheCO-TerminatingPINX.185.2.3.5InteractionwithCallIntrusion.185.2.3.5.1ActionsattheCO-OriginatingPINX.185.2.3.5.2ActionsattheCO-TerminatingPINX.186Compliance.197Requirementsforacomprehensivetestingservice.19History.20SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)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).ThepresentdocumentcoversthePrivateIntegratedServiceNetwork(PISN)Inter-exchangesignallingprotocol-CallOffersupplementaryservice-TestSuiteStructureandTestPurposes(TSS&TP)specification.Thepresentdocumentispart1ofamulti-partENcoveringthePrivateIntegratedServiceNetwork(PISN);Inter-exchangesignallingprotocol;Calloffersupplementaryservice,asidentifiedbelow:Part1:"TestSuiteStructureandTestPurposes(TSS&TP)specification";Part2:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proforma".NationaltranspositiondatesDateofadoptionofthisEN:3November2000DateoflatestannouncementofthisEN(doa):28February2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2001DateofwithdrawalofanyconflictingNationalStandard(dow):31August2001SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)51ScopeThepresentdocumentspecifiestheTestSuiteStructureandTestPurposes(TSS&TP)fortheCallOffersupplementaryservicesoftheInterexchangesignallingprotocolforPrivateIntegratedServicesNetworks(PISN).Theobjectiveofthepresentdocumentistoprovideconformancetestswhichgiveagreaterprobabilityofinter-operability.TheTSSandTPsspecificationcoverstheproceduresdescribedinEN300362[3].TheISOstandardforthemethodologyofconformancetesting(ISO/IEC9646-1[5],ISO/IEC9646-2[6]andISO/IEC9646-3[11])isusedasbasisforthetestmethodology.TheTestSuiteStructureandTestPurposesspecifiedinthepresentdocumentareonlyintendedforVPNscenariosatthe"b"serviceentrypoint.TheVPN"b"serviceentrypointisdefinedinEN301060-1[9]andETR172[10].2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETSIEN300172(V1.4):"PrivateIntegratedServicesNetwork(PISN);Inter-exchangesignallingprotocol;Circuit-modebasicservices[ISO/IEC11572(1996)modified]".[2]ETSIETS300239(1995):"PrivateIntegratedServicesNetwork(PISN);Inter-exchangesignallingprotocol;Genericfunctionalprotocolforthesupportofsupplementaryservices[ISO/IEC11582(1995),modified]".[3]ETSIEN300362:"PrivateIntegratedServicesNetwork(PISN);Inter-exchangesignallingprotocol;Calloffersupplementaryservice[ISO/IEC14843(1996),modified]".[4]ETSIETS300406(1995):"MethodsforTestingandSpecification(MTS);Protocolandprofileconformancetestingspecifications;Standardizationmethodology".[5]ISO/IEC9646-1(1994):"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part1:Generalconcepts".[6]ISO/IEC9646-2(1994):"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part2:Abstracttestsuitespecification".[7]ITU-TRecommendationI.112(1993):"VocabularyoftermsforISDNs".[8]ITU-TRecommendationI.210(1993):"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".[9]ETSIEN301060-1:"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part1:Protocolspecification".[10]ETSIETR172:"BusinessTeleCommunications(BTC);VirtualPrivateNetworking(VPN);Servicesandnetworkingaspects;Standardizationrequirementsandworkitems".SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)6[11]ISO/IEC9646-3:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part3:TheTreeandTabularCombinedNotation(TTCN)".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:AbstractTestSuite(ATS):refertoISO/IEC9646-1[5].ImplementationUnderTest(IUT):refertoISO/IEC9646-1[5].ProtocolImplementationConformanceStatement(PICS):refertoISO/IEC9646-1[5].PICSproforma:refertoISO/IEC9646-1[5].TestPurpose(TP):refertoISO/IEC9646-1[5].callindependentsignallingconnection:seeETS300239[2],definition4.7.callrelated:seeETS300239[2],definition4.9.incomingcall:seeEN300172[1],subclause4.4.InformationElements(IEs)withinvalidcontents:seeEN300172[1],subclause4.14.IntegratedServicesDigitalNetwork(ISDN):seeITU-TRecommendationI.112[7],definition308.invokeAPDU:seeETS300239[2],subclause11.3.3.4.originatingPINX:seeEN300172[1],subclause4.5.outgoingcall:seeEN300172[1],subclause4.4.rejectAPDU:seeETS300239[2],subclause11.3.3.4.returnerrorAPDU:seeETS300239[2],subclause11.3.3.4.returnresultAPDU:seeETS300239[2],subclause11.3.3.4.service;telecommunicationservice:seeITU-TRecommendationI.112[7],definition201.supplementaryservice:seeITU-TRecommendationI.210[8],subclause2.4.terminatingPINX:seeEN300172[1],subclause4.5.transitPINX:seeEN300172[1],subclause4.5.VirtualPrivateNetwork(VPN):refertoEN301060-1[9]andETR172[10].3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:APDUApplicationProtocolDataUnitATSAbstractTestSuiteCFBCallForwardingBusyCFUCallForwardingUnconditionalCICallIntrusionCOCallOfferCR1CallReference#1SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)7CR2CallReference#2CTCallTransferDNDODoNotDisturbOverrideIEInformationElementISDNIntegratedServicesDigitalNetworkIUTImplementationUnderTestPICSProtocolImplementationConformanceStatementPINXPrivateIntegratedServicesNetworkeXchangePISNPrivateIntegratedServicesNetworkPIXITProtocolImplementationeXtraInformationforTestingT1TimerT1PRT1TimerPRT1TPTestPurposeTSSTestSuiteStructureVPNVirtualPrivateNetwork4TestSuiteStructure(TSS)SignallingproceduresattheVPN"b"serviceentrypointGroupProceduresattheOriginatingPINXforSendingSS-CORequestwithoutPathRetentionOrig01forSendingSS-CORequestwithPathRetentionOrig02ProceduresattheTerminatingPINXforReceiptSS-CORequestwithoutPathRetentionTerm01forReceiptSS-CORequestwithPathRetentionTerm02ProceduresforProtocolInteractionsbetweenCallOfferandCallTransferattheCO-OriginatingPINXCT_OrigattheCO-TerminatingPINXCT_TermProceduresforProtocolInteractionsbetweenCallOfferandCallForwardingUnconditionalattheCO-OriginatingPINXCFU_OrigattheCO-TerminatingPINXCFU_TermProceduresforProtocolInteractionsbetweenCallOfferandCallForwardingBusyattheCO-OriginatingPINXCFB_OrigattheCO-TerminatingPINXCFB_TermProceduresforProtocolInteractionsbetweenCallOfferandDoNotDisturbOverrideattheCO-TerminatingPINXDNDO_TermProceduresforProtocolInteractionsbetweenCallOfferandCallIntrusionattheCO-OriginatingPINXCI_OrigattheCO-TerminatingPINXCI_TermSIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)85TestPurposes(TP)5.1IntroductionForeachtestrequirementaTPisdefined.5.1.1TPnamingconventionTPsarenumbered,startingat001,withineachgroup.GroupsareorganizedaccordingtotheTSS.Additionalreferencesareaddedtoidentifytheactualtestsuiteandwhetheritappliestothenetworkortheuser(seetable1).Table1:TPidentifiernamingconventionschemeIdentifier:__=supplementaryservice:"CO"=groupupto10digitfieldrepresentinggroupreferenceaccordingtoTSS=sequentialnumber(001-999)5.1.2SourceofTPdefinitionTheTPsarebasedonEN300362[3].SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)95.1.3TPstructureEachTPhasbeenwritteninamannerwhichisconsistentwithallotherTPs.TheintentionofthisistomaketheTPsmorereadableandcheckable.Aparticularstructurehasbeenusedandthisisillustratedintable2.ThistableshouldbereadinconjunctionwithanyTP,i.e.useaTPasanexampletofullyunderstandthetable.Table2:StructureofasingleTPforCOTPpartTextExampleHeadertabSeetable1tabSubclause0.0.0StimulusEnsurethattheIUTintheorState3orCO-Idle,etc.seebelowformessagestructureReceivingaXXXXmessageortorequesta.ReactionSends,saves,does,etc.Usingenblocsending.Iftheactionissendingseebelowformessagestructure,etc.andremainsinthesamestateorandentersstateMessagestructuremessagecontainingaSETUP,FACILITY,CONNECT.a)informationelementwithb)aencodedasorincludingandbacktoaorb,Bearercapability,Facility.SelectionSelectioncriteriareferenceSupportofSS-COinOriginatingPINX.PICS:A1NOTE1:Inordertousethesamestructureasforthetestgroupselection,theselectioncriteriaisindicatedatthebottomofthetestpurpose.NOTE2:Unlessspecifiedthemessagesarevalidandcontainatleastthemandatoryinformationelementsandpossiblyoptionalinformationelements,theinformationelementsarevalidandcontainatleastthemandatoryparametersandpossiblyoptionalparameters.5.1.4TeststrategyAsthebasestandardEN300362[3]containsnoexplicitrequirementsfortesting,theTPsweregeneratedasaresultofananalysisofthebasestandardandthecorrespondingPICSproforma.TheTPsareonlybasedonconformancerequirementsrelatedtotheexternallyobservablebehaviouroftheIUT,andarelimitedtoconceivablesituationstowhicharealimplementationislikelytobefaced(ETS300406[4]).5.2TPsforCOAllPICSitemsreferredtointhissubclauseareasspecifiedinEN300362[3]unlessindicatedotherwisebyanothernumberedreference.Unlessspecified:-onlytherequirementsfromthepointofviewoftheVPN"b"serviceentrypointareconsidered.ThisimpliesthattheinteractionswithothernetworksareoutofscopeofthisspecificationandcausesthatthecorrespondingTestPurposesarenotincludedinthisspecification;-themessagesindicatedarevalidandcontainatleastthemandatoryinformationelementsandpossiblyoptionalinformationelements;-theinformationelementsindicatedarevalidandcontainatleastthemandatoryparametersandpossiblyoptionalparameters.SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)10Thefollowingwordingconventionwasdefinedtomakethetestpurposesmorereadable:-whenamessageistobesentorreceivedonacallindependentsignallingconnection,themessagenameshallbefollowedbya"(sc)",e.g.CONNECT(sc)meansthattheCONNECTmessageisconveyedonacallindependentsignallingconnection.AllthetestpurposesarevalidforbothuserandnetworksideoftheVPNbinterface.Inordertosimplifythetextandtomakethetestpurposesmorereadable,onlytheUsersideCallstates(Ux)areindicatedinthetestpurposes.ForthenetworksideoftheVPNbinterface,themappingtable3indicateswhichnetworkcallstate(Ny)correspondstotheusercallstateusedinthetestpurpose.EquivalentcallstatemeanstherethatthesamemessageflowappliesfromtheIUTpointofview(e.g.:IUTsendsaSETUPmessagegivesthecallstateU01orN06).Table3UsersidecallstateEquivalentnetworksidecallstateU00N00U03N09U04N07U07N04U09N03U10N10U11N12U19N19EXAMPLE:EnsurethattheIUTinthecallstateU03…isequivalenttothefollowingnetworksidetestpurpose:EnsurethattheIUTinthecallstateN09…5.2.1SS-COsignallingprocedures5.2.1.1ActionsattheOriginatingPINX5.2.1.1.1SendingCORequestwithoutPathRetentionCO_Orig01_001subclause6.6.1.1EnsurethattheIUTinthecallstateU00andintheCO-Idlestate,inordertoinitiateaCORequest,sendsaSETUPmessagecontainingintheFacilityIEacallOfferRequestinvokeAPDUandenterstheCO-Wait-Ackstate.CO_Orig01_002subclause6.6.1.1EnsurethattheIUTinthecallstateU03andintheCO-Wait-Ackstate,receivingaFACILITYmessagecontainingintheFacilityIEacallOfferRequestreturnresultAPDU,sendsnomessages,remainsinthecallstateU03andenterstheCO-Idlestate.CO_Orig01_003subclause6.6.1.1EnsurethattheIUTinthecallstateU03andintheCO-Wait-Ackstate,receivingaPROGRESSmessagecontainingintheFacilityIEacallOfferRequestreturnresultAPDU,sendsnomessages,remainsinthecallstateU03andenterstheCO-Idlestate.CO_Orig01_004subclause6.6.1.1EnsurethattheIUTinthecallstateU03andintheCO-Wait-AckstatereceivinganALERTINGmessagecontainingintheFacilityIEacallOfferRequestreturnresultAPDU,sendsnomessages,entersthecallstateU04andtheCO-Idlestate.SIST EN 301 491-1 V1.1.2:2005
ETSIETSIEN301491-1V1.1.2(2000-11)11CO_Orig01_005subclause6.6.1.2EnsurethattheIUTinthecallstateU03andintheCO-Wait-Ackstate,receivingaALERTINGmessagewithoutanyFacilityIE,sendsnomessages,entersthecallstateU04andtheCO-Idlestate.CO_Orig01_006subclause6.6.1.2EnsurethattheIUTinthecallstateU03andintheCO-Wait-Ackstate,receivingaCONNECTmessagecontainingintheFacilityIEacallOfferRequestreturnerrorAPDU,sendsaCONNECTACKNOWLEDGEmessage,entersthecallstateU10andtheCO-Idlestate.CO_Orig01_007subclause6.6.1.2EnsurethattheIUTinthecallstateU03andtheCO-Wait-Ackstate,receivingaDISCONNECTmessagecontainingintheFacilityIEacallOfferRequestrejectAPDU,sendsaRELEASEmessage,entersthecallstateU19andtheCO-Idlestate.CO_Orig01_008subclause6.6.1.2EnsurethattheIUTinthecallstateU03andtheCO-Wait-Ackstate,onexpiryoftimerT1,sendsnomessage,remainsinthesameprotocolcontrolstateasitwasandenterstheCO-Idlestate.5.2.1.1.2SendingCORequestwithPathRetentionCO_Orig02_001subclauseA.5.1EnsurethattheIUTinthecallstateU00andinthePRTO-Idlestate,inordertorequestpathretentionforCORequestinvocation,sendsaSETUPmessagecontainingintheFacilityIEapathRetaininvokeAPDUwiththebitforcallO
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