ETSI EN 301 065-1 V1.2.2 (1998-10)

Integrated Services Digital Network (ISDN); Completion of Calls on No Reply (CCNR) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

DEN/SPS-05115-1

Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev: dokončanje klicanja, ko ni odziva (CCNR) - Protokol digitalne naročniške signalizacije št. 1 (DSS1) - 1. del: Specifikacija protokola

General Information

• Status: Published
• Publication Date: 08-Oct-1998
• Technical Committee: SPS 5 4 - Supplementary Services
• Current Stage: 12 - Completion
• Due Date: 23-Oct-1998
• Completion Date: 09-Oct-1998
• Ref Project: SIST EN 301 065-1:2001 - Integrated Services Digital Network (ISDN); Completion of Calls on No Reply (CCNR) supplementary service; 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.VWRULWHYRþQLãNHIntegrated Services Digital Network (ISDN); Completion of Calls on No Reply (CCNR) supplementary service; 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 301 065-1 V1.2.23SIST EN 301 065-1:en01-GHFHPEHU3SIST EN 301 065-1:SLOVENSKI
STANDARD



SIST EN 301 065-1:2001



EN 301 065-1 V1.2.2 (1998-10)European Standard (Telecommunications series)Integrated Services Digital Network (ISDN);Completion of Calls on No Reply (CCNR)supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specificationSIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)2ReferenceDEN/SPS-05115-1 (9v090ipc.PDF)KeywordsISDN, DSS1, supplementary service, CCNRETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail]://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.All rights reserved.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)3ContentsIntellectual Property Rights.5Foreword.51Scope.72Normative references.73Definitions.84Abbreviations.105Description.106Operational requirements.106.1Provision and withdrawal.106.2Requirements on the network A side.116.3Requirements on the network B side.117Coding requirements.118State definitions.148.1User A states.148.2User B states.148.3Network A states.148.4Network B states.149Signalling procedures at the coincident S and T reference point.149.1Activation.149.1.1Normal operation.149.1.2Exceptional procedures.169.2User initiated deactivation procedure.179.3Interrogation.179.3.1General interrogation.179.3.1.1Normal operation.179.3.1.2Exceptional procedures.189.3.2Specific interrogation.189.3.2.1Normal operation.189.3.2.2Exceptional procedures.189.4Invocation and operation.199.4.1Recall indication.199.4.1.1Normal operation.199.4.1.2Exceptional procedures.199.4.2CCNR call request.209.4.3CCNR call establishment.209.4.4Network initiated deactivation procedures.209.4.5B free but A busy procedure.209.4.5.1Normal operation.209.4.5.2Exceptional procedures.209.4.6User A monitoring procedure.219.4.6.1Normal operation.219.4.6.2Exceptional procedures.219.5Procedures at network B.219.5.1Determination that CCNR is available.219.5.1.1Normal operation.219.5.1.2Exceptional procedures.219.5.2Acceptance of a CCNR request.229.5.3Queue B processing.229.5.3.1Normal operation.229.5.3.2Exceptional procedures.22SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)49.5.4Determination of user B free.229.5.5CCNR call.229.6Call information retention.229.6.1Normal operation.239.6.2Exceptional procedures.239.7Basic call information and compatibility checking at user A.2310Procedures for interworking with private ISDNs.2410.1Procedures for the originating T reference point.2410.1.1CCNR available indication.2410.1.1.1Normal operation.2410.1.1.2Exceptional procedures.2410.1.2CCNR supplementary service request.2410.1.2.1Normal operation.2410.1.2.2Exceptional procedures.2510.1.3User B free indication.2510.1.4Suspend request.2510.1.5Resume request.2510.1.6CCNR call establishment.2510.1.7Deactivation.2510.2Procedures for the destination T reference point.2610.2.1CCNR available indication.2610.2.1.1Normal operation.2610.2.1.2Exceptional procedures.2610.2.2CCNR supplementary service request.2610.2.2.1Normal operation.2610.2.2.2Exceptional procedures.2610.2.3User B free indication.2710.2.3ANormal operation.2710.2.4Suspend request.2710.2.5Resume request.2710.2.6CCNR call establishment.2710.2.7Deactivation.2711Interactions with other networks.2712Interactions with other supplementary services.2713Parameter values (timers).2814Dynamic description (SDL diagrams).29Annex A (informative):CCNR signalling flows.73Annex B (normative):Provision of status request procedures.81Annex C (informative):Assignment of object identifier values.82History.83SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)5Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee SignallingProtocols and Switching (SPS).The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) Completion of Calls on No Reply(CCNR) supplementary service, as described below:Part 1:"Protocol specification";Part 2:"Protocol Implementation Conformance Statement (PICS) proforma specification";Part 3:"Test Suite Structure and Test Purposes (TSS&TP) specification for the user";Part 4:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)proforma specification for the user";Part 5:"Test Suite Structure and Test Purposes (TSS&TP) specification for the network";Part 6:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)proforma specification for the network".In accordance with CCITT Recommendation I.130, the following three level structure is used to describe thesupplementary telecommunication services as provided by European public telecommunications operators under thepan-European ISDN:-Stage 1: is an overall service description, from the user's standpoint;-Stage 2: identifies the functional capabilities and information flows needed to support the service described instage 1; and-Stage 3: defines the signalling system protocols and switching functions needed to implement the servicedescribed in stage 1.The present document details the stage 3 aspects (signalling system protocols and switching functions) needed tosupport the CCNR supplementary service. The stage 1 aspects are detailed in EN 301 134.NOTE:Currently no stage 2 document exists.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)6National transposition datesDate of adoption of this EN:9 October 1998Date of latest announcement of this EN (doa):31 January 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 July 1999Date of withdrawal of any conflicting National Standard (dow):31 July 1999SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)71ScopeThis first part of EN 301 065 specifies the stage three of the Completion of Calls on No Reply (CCNR) supplementaryservice for the pan-European Integrated Services Digital Network (ISDN) as provided by European publictelecommunications operators at the T reference point or coincident S and T reference point (as defined inITU-T Recommendation I.411 [6]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol.Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service(see CCITT Recommendation I.130 [3]).In addition, the present document specifies the protocol requirements at the T reference point where the service isprovided to the user via an intermediate private ISDN.The present document does not specify the additional protocol requirements where the service is provided to the user viaa telecommunications network that is not an ISDN.The CCNR supplementary service enables user A, encountering a destination B, which does not answer the call, to havethe call completed without having to make a new call attempt when the destination B becomes not busy after havinginitiated an activity .The CCNR supplementary service is applicable to all circuit-switched telecommunication services with the followingexceptions:a)call 2 of the videotelephony teleservice;b)call 2 of the audiographic conference teleservice;c)call 2 and subsequent calls of videoconference teleservice;d)all other circuit-switched telecommunication services requiring the use of more than one B-channel.Further parts of EN 301 065 specify the method of testing required to identify conformance to the present document.The present document is applicable to equipment supporting the CCNR supplementary service, to be attached at eitherside of a T reference point or coincident S and T reference point when used as an access to the public ISDN.2Normative referencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case the latest version applies.A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]ITU-T Recommendation E.164 (1997): "The international public telecommunication numberingplan".[2]ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".[3]CCITT Recommendation I.130 (1988): "Method for the characterization of telecommunicationservices supported by an ISDN and network capabilities of an ISDN".SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)8[4]ITU-T Recommendation I.210 (1993): "Principles of telecommunication services supported by anISDN and the means to describe them".[5]ITU-T Recommendation I.221 (1993): "Common specific characteristics of services".[6]ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces; Reference configurations".[7]CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".[8]CCITT Recommendation X.208 (1988): "Specification of Abstract Syntax Notation One(ASN.1)".[9]CCITT Recommendation X.219 (1988): "Remote Operations: Model, notation and servicedefinition".[10]CCITT Recommendation Z.100 (1993): "Specification and Description Language (SDL)".[11]EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling SystemNo. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1:Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".[12]ETS 300 403-2: "Integrated Services Digital Network (ISDN); Digital Subscriber SignallingSystem No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part2: Specification and Description Language (SDL) diagrams".[13]EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".[14]EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for thesupport of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification".[15]EN 300 359-1: "Integrated Services Digital Network (ISDN); Completion of Calls to BusySubscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1)protocol; Part 1: Protocol specification".3DefinitionsFor the purposes of the present document, the following definitions apply:activity: the activity condition applies, if at least one CCNR request is in queue B and any user at destination B either:-initiates an outgoing call with a SETUP message; or,-answers an incoming call with a CONNECT message; or- clears an established call; or,- clears an outgoing call.busy: See ITU-T Recommendation I.221 [5], subclause 2.1.5.call: See CCITT Recommendation Q.9 [7], definition 2201.call information retention: A procedure of network A to store the call information of a specific call so that it can beused for that call.call state: A state as defined in EN 300 403-1 [11], subclause 2.1 for either the user or the network as appropriate. Acall state may exist for each call reference value (and for each additional responding CEI in the incoming call states).SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)9CCNR busy: Any one of the following conditions will cause a CCNR busy condition:-maximum number of calls reached at user A (see ITU-T Recommendation I.221 [5], subclause 2.1.3, item 2);-no B-channels available at user A;-CCNR or CCBS recall pending on user A.CCNR call: A call which is established under the control of the CCNR supplementary service.CCNR recall: The procedure where user A is requested to complete the communication when user B ceases to be busyafter having initiated an activity.CCBS request retention: If an attempt to establish a CCNR call fails because the destination is busy, then the networkprovider option "CCBS request retention" defines whether the CCNR supplementary service shall continue or not, i.e. ifthe "CCBS request retention" is supported, the original CCNR request shall retain its position in the queue B, andmonitoring of user B shall continue. Otherwise, on receiving an indication that user alerting has been initiated at thecalled address the CCNR request will be deactivated.destination B: The entity addressed in the original call.existing service: The basic telecommunication service associated with speech, 3,1 kHz audio and 64 kbit/s unrestrictedbearer capabilities.Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [2], definition 308.ISDN number: A number conforming to the numbering plan and structure specified inITU-T Recommendation E.164 [1].invoke component: See EN 300 196-1 [14], subclause 8.2.2.1. Where reference is made to an "xxxx" invokecomponent, an invoke component is meant with its operation value set to the value of the operation "xxxx".network: The DSS1 protocol entity at the network side of the user-network interface.network A: The network, at the coincident S and T reference point, to which user A is attached.network B: The network, at the coincident S and T reference point, which is identified as destination B.private network: The DSS1 protocol entity at the user side of the user-network interface at the T reference point.public network: The DSS1 protocol entity at the network side of the user-network interface at the T reference point.queue A: A buffer at network A for the control of CCNR requests associated with user A, provided on a per-ISDNnumber basis.queue B: A buffer at network B for the control of CCNR requests associated with destination B. Resource is provided inthe buffer for each ISDN number, but the buffer is processed on a per-access basis. The buffer is used to support themonitoring of user B to become not busy after having initiated an activity.reject component: See EN 300 196-1 [14], subclause 8.2.2.4.return error component: See EN 300 196-1 [14], subclause 8.2.2.3. Where reference is made to an "xxxx" return errorcomponent, a return error component is meant which is related to an "xxxx" invoke component.return result component: See EN 300 196-1 [14], subclause 8.2.2.2. Where reference is made to an "xxxx" returnresult component, a return result component is meant which is related to an "xxxx" invoke component.service; telecommunication service: See ITU-T Recommendation I.112 [2], definition 201.supplementary service: See ITU-T Recommendation I.210 [4], subclause 2.4.user: The DSS1 protocol entity at the user side of the user-network interface.user A: The user, at the coincident S and T reference point, who originated the call and to whom the CCNRsupplementary service is provided.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)10user B: The user, at the coincident S and T reference point, which is identified as destination B.4AbbreviationsFor the purposes of the present document, the following abbreviations apply:ASN.1Abstract Syntax Notation OneCCBSCompletion of Calls to Busy SubscriberCCNRCompletion of Calls on No ReplyDCRDummy Call ReferenceDSS1Digital Subscriber Signalling System No. oneISDNIntegrated Services Digital Network5DescriptionThe CCNR supplementary service enables user A, encountering a destination B, which does not answer the call, to havethe call completed without having to make a new call attempt when the destination B becomes not busy after havinginitiated an activity. User A can request the CCNR supplementary service when the call is in the alerting phase and aftercall clearing during the alerting phase before the retention timer is expired.When user A requests the CCNR supplementary service, the network B will monitor destination B for becoming notbusy after having initiated an activity.When the destination B becomes not busy, (i.e. access resources e.g. one B-channel are not busy) after having initiatedan activity, then the network will wait a short time in order to allow the resources to be reused for originating a call. Ifthe resources are not reused within this time by destination B, then the network B will automatically recall user A.When user A accepts the CCNR recall, then network A will automatically generate a CCNR call to destination B.NOTE:The procedures for the CCNR supplementary service are similar to the procedures specified in the CCBSstandard. Therefore, where possible, the terms (e.g. CCBSReference parameter) as defined for the CCBSsupplementary service are used and in some cases a reference to the subclauses in EN 300 359-1 [15] ismade.6Operational requirements6.1Provision and withdrawalCCNR may be provided to subscribers by the network provider on a subscription basis or may be generally available.Withdrawal may happen on subscriber's request or for administrative reasons.As a network option, the CCNR supplementary service can be offered with a subscription option which shall apply tothe whole access
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VWRULWHYRþQLãNHIntegrated Services Digital Network (ISDN); Completion of Calls on No Reply (CCNR) supplementary service; 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 301 065-1 Version 1.2.2SIST EN 301 065-1:2001en01-februar-2001SIST EN 301 065-1:2001SLOVENSKI
STANDARD



SIST EN 301 065-1:2001



EN 301 065-1 V1.2.2 (1998-10)European Standard (Telecommunications series)Integrated Services Digital Network (ISDN);Completion of Calls on No Reply (CCNR)supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specificationSIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)2ReferenceDEN/SPS-05115-1 (9v090ipc.PDF)KeywordsISDN, DSS1, supplementary service, CCNRETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail]://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.All rights reserved.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)3ContentsIntellectual Property Rights.5Foreword.51Scope.72Normative references.73Definitions.84Abbreviations.105Description.106Operational requirements.106.1Provision and withdrawal.106.2Requirements on the network A side.116.3Requirements on the network B side.117Coding requirements.118State definitions.148.1User A states.148.2User B states.148.3Network A states.148.4Network B states.149Signalling procedures at the coincident S and T reference point.149.1Activation.149.1.1Normal operation.149.1.2Exceptional procedures.169.2User initiated deactivation procedure.179.3Interrogation.179.3.1General interrogation.179.3.1.1Normal operation.179.3.1.2Exceptional procedures.189.3.2Specific interrogation.189.3.2.1Normal operation.189.3.2.2Exceptional procedures.189.4Invocation and operation.199.4.1Recall indication.199.4.1.1Normal operation.199.4.1.2Exceptional procedures.199.4.2CCNR call request.209.4.3CCNR call establishment.209.4.4Network initiated deactivation procedures.209.4.5B free but A busy procedure.209.4.5.1Normal operation.209.4.5.2Exceptional procedures.209.4.6User A monitoring procedure.219.4.6.1Normal operation.219.4.6.2Exceptional procedures.219.5Procedures at network B.219.5.1Determination that CCNR is available.219.5.1.1Normal operation.219.5.1.2Exceptional procedures.219.5.2Acceptance of a CCNR request.229.5.3Queue B processing.229.5.3.1Normal operation.229.5.3.2Exceptional procedures.22SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)49.5.4Determination of user B free.229.5.5CCNR call.229.6Call information retention.229.6.1Normal operation.239.6.2Exceptional procedures.239.7Basic call information and compatibility checking at user A.2310Procedures for interworking with private ISDNs.2410.1Procedures for the originating T reference point.2410.1.1CCNR available indication.2410.1.1.1Normal operation.2410.1.1.2Exceptional procedures.2410.1.2CCNR supplementary service request.2410.1.2.1Normal operation.2410.1.2.2Exceptional procedures.2510.1.3User B free indication.2510.1.4Suspend request.2510.1.5Resume request.2510.1.6CCNR call establishment.2510.1.7Deactivation.2510.2Procedures for the destination T reference point.2610.2.1CCNR available indication.2610.2.1.1Normal operation.2610.2.1.2Exceptional procedures.2610.2.2CCNR supplementary service request.2610.2.2.1Normal operation.2610.2.2.2Exceptional procedures.2610.2.3User B free indication.2710.2.3ANormal operation.2710.2.4Suspend request.2710.2.5Resume request.2710.2.6CCNR call establishment.2710.2.7Deactivation.2711Interactions with other networks.2712Interactions with other supplementary services.2713Parameter values (timers).2814Dynamic description (SDL diagrams).29Annex A (informative):CCNR signalling flows.73Annex B (normative):Provision of status request procedures.81Annex C (informative):Assignment of object identifier values.82History.83SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)5Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee SignallingProtocols and Switching (SPS).The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) Completion of Calls on No Reply(CCNR) supplementary service, as described below:Part 1:"Protocol specification";Part 2:"Protocol Implementation Conformance Statement (PICS) proforma specification";Part 3:"Test Suite Structure and Test Purposes (TSS&TP) specification for the user";Part 4:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)proforma specification for the user";Part 5:"Test Suite Structure and Test Purposes (TSS&TP) specification for the network";Part 6:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)proforma specification for the network".In accordance with CCITT Recommendation I.130, the following three level structure is used to describe thesupplementary telecommunication services as provided by European public telecommunications operators under thepan-European ISDN:-Stage 1: is an overall service description, from the user's standpoint;-Stage 2: identifies the functional capabilities and information flows needed to support the service described instage 1; and-Stage 3: defines the signalling system protocols and switching functions needed to implement the servicedescribed in stage 1.The present document details the stage 3 aspects (signalling system protocols and switching functions) needed tosupport the CCNR supplementary service. The stage 1 aspects are detailed in EN 301 134.NOTE:Currently no stage 2 document exists.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)6National transposition datesDate of adoption of this EN:9 October 1998Date of latest announcement of this EN (doa):31 January 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 July 1999Date of withdrawal of any conflicting National Standard (dow):31 July 1999SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)71ScopeThis first part of EN 301 065 specifies the stage three of the Completion of Calls on No Reply (CCNR) supplementaryservice for the pan-European Integrated Services Digital Network (ISDN) as provided by European publictelecommunications operators at the T reference point or coincident S and T reference point (as defined inITU-T Recommendation I.411 [6]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol.Stage three identifies the protocol procedures and switching functions needed to support a telecommunication service(see CCITT Recommendation I.130 [3]).In addition, the present document specifies the protocol requirements at the T reference point where the service isprovided to the user via an intermediate private ISDN.The present document does not specify the additional protocol requirements where the service is provided to the user viaa telecommunications network that is not an ISDN.The CCNR supplementary service enables user A, encountering a destination B, which does not answer the call, to havethe call completed without having to make a new call attempt when the destination B becomes not busy after havinginitiated an activity .The CCNR supplementary service is applicable to all circuit-switched telecommunication services with the followingexceptions:a)call 2 of the videotelephony teleservice;b)call 2 of the audiographic conference teleservice;c)call 2 and subsequent calls of videoconference teleservice;d)all other circuit-switched telecommunication services requiring the use of more than one B-channel.Further parts of EN 301 065 specify the method of testing required to identify conformance to the present document.The present document is applicable to equipment supporting the CCNR supplementary service, to be attached at eitherside of a T reference point or coincident S and T reference point when used as an access to the public ISDN.2Normative referencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case the latest version applies.A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]ITU-T Recommendation E.164 (1997): "The international public telecommunication numberingplan".[2]ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".[3]CCITT Recommendation I.130 (1988): "Method for the characterization of telecommunicationservices supported by an ISDN and network capabilities of an ISDN".SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)8[4]ITU-T Recommendation I.210 (1993): "Principles of telecommunication services supported by anISDN and the means to describe them".[5]ITU-T Recommendation I.221 (1993): "Common specific characteristics of services".[6]ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces; Reference configurations".[7]CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".[8]CCITT Recommendation X.208 (1988): "Specification of Abstract Syntax Notation One(ASN.1)".[9]CCITT Recommendation X.219 (1988): "Remote Operations: Model, notation and servicedefinition".[10]CCITT Recommendation Z.100 (1993): "Specification and Description Language (SDL)".[11]EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling SystemNo. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1:Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".[12]ETS 300 403-2: "Integrated Services Digital Network (ISDN); Digital Subscriber SignallingSystem No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part2: Specification and Description Language (SDL) diagrams".[13]EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".[14]EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for thesupport of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification".[15]EN 300 359-1: "Integrated Services Digital Network (ISDN); Completion of Calls to BusySubscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1)protocol; Part 1: Protocol specification".3DefinitionsFor the purposes of the present document, the following definitions apply:activity: the activity condition applies, if at least one CCNR request is in queue B and any user at destination B either:-initiates an outgoing call with a SETUP message; or,-answers an incoming call with a CONNECT message; or- clears an established call; or,- clears an outgoing call.busy: See ITU-T Recommendation I.221 [5], subclause 2.1.5.call: See CCITT Recommendation Q.9 [7], definition 2201.call information retention: A procedure of network A to store the call information of a specific call so that it can beused for that call.call state: A state as defined in EN 300 403-1 [11], subclause 2.1 for either the user or the network as appropriate. Acall state may exist for each call reference value (and for each additional responding CEI in the incoming call states).SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)9CCNR busy: Any one of the following conditions will cause a CCNR busy condition:-maximum number of calls reached at user A (see ITU-T Recommendation I.221 [5], subclause 2.1.3, item 2);-no B-channels available at user A;-CCNR or CCBS recall pending on user A.CCNR call: A call which is established under the control of the CCNR supplementary service.CCNR recall: The procedure where user A is requested to complete the communication when user B ceases to be busyafter having initiated an activity.CCBS request retention: If an attempt to establish a CCNR call fails because the destination is busy, then the networkprovider option "CCBS request retention" defines whether the CCNR supplementary service shall continue or not, i.e. ifthe "CCBS request retention" is supported, the original CCNR request shall retain its position in the queue B, andmonitoring of user B shall continue. Otherwise, on receiving an indication that user alerting has been initiated at thecalled address the CCNR request will be deactivated.destination B: The entity addressed in the original call.existing service: The basic telecommunication service associated with speech, 3,1 kHz audio and 64 kbit/s unrestrictedbearer capabilities.Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [2], definition 308.ISDN number: A number conforming to the numbering plan and structure specified inITU-T Recommendation E.164 [1].invoke component: See EN 300 196-1 [14], subclause 8.2.2.1. Where reference is made to an "xxxx" invokecomponent, an invoke component is meant with its operation value set to the value of the operation "xxxx".network: The DSS1 protocol entity at the network side of the user-network interface.network A: The network, at the coincident S and T reference point, to which user A is attached.network B: The network, at the coincident S and T reference point, which is identified as destination B.private network: The DSS1 protocol entity at the user side of the user-network interface at the T reference point.public network: The DSS1 protocol entity at the network side of the user-network interface at the T reference point.queue A: A buffer at network A for the control of CCNR requests associated with user A, provided on a per-ISDNnumber basis.queue B: A buffer at network B for the control of CCNR requests associated with destination B. Resource is provided inthe buffer for each ISDN number, but the buffer is processed on a per-access basis. The buffer is used to support themonitoring of user B to become not busy after having initiated an activity.reject component: See EN 300 196-1 [14], subclause 8.2.2.4.return error component: See EN 300 196-1 [14], subclause 8.2.2.3. Where reference is made to an "xxxx" return errorcomponent, a return error component is meant which is related to an "xxxx" invoke component.return result component: See EN 300 196-1 [14], subclause 8.2.2.2. Where reference is made to an "xxxx" returnresult component, a return result component is meant which is related to an "xxxx" invoke component.service; telecommunication service: See ITU-T Recommendation I.112 [2], definition 201.supplementary service: See ITU-T Recommendation I.210 [4], subclause 2.4.user: The DSS1 protocol entity at the user side of the user-network interface.user A: The user, at the coincident S and T reference point, who originated the call and to whom the CCNRsupplementary service is provided.SIST EN 301 065-1:2001



ETSIEN 301 065-1 V1.2.2 (1998-10)10user B: The user, at the coincident S and T reference point, which is identified as destination B.4AbbreviationsFor the purposes of the present document, the following abbreviations apply:ASN.1Abstract Syntax Notation OneCCBSCompletion of Calls to Busy SubscriberCCNRCompletion of Calls on No ReplyDCRDummy Call ReferenceDSS1Digital Subscriber Signalling System No. oneISDNIntegrated Services Digital Network5DescriptionThe CCNR supplementary service enables user A, encountering a destination B, which does not answer the call, to havethe call completed without having to make a new call attempt when the destination B becomes not busy after havinginitiated an activity. User A can request the CCNR supplementary service when the call is in the alerting phase and aftercall clearing during the alerting phase before the retention timer is expired.When user A requests the CCNR supplementary service, the network B will monitor destination B for becoming notbusy after having initiated an activity.When the destination B becomes not busy, (i.e. access resources e.g. one B-channel are not busy) after having initiatedan activity, then the network will wait a short time in order to allow the resources to be reused for originating a call. Ifthe resources are not reused within this time by destination B, then the network B will automatically recall user A.When user A accepts the CCNR recall, then network A will automatically generate a CCNR call to destination B.NOTE:The procedures for the CCNR supplementary service are similar to the procedures specified in the CCBSstandard. Therefore, where possible, the terms (e.g. CCBSReference parameter) as defined for the CCBSsupplementary service are used and in some cases a reference to the subclauses in EN 300 359-1 [15] ismade.6Operational requirements6.1Provision and withdrawalCCNR may be provided to subscribers by the network provider on a subscription basis or may be generally available.Withdrawal may happen on subscriber's request or for administrative reasons.As a network option, the CCNR supplementary service can be offered with a subscription option which shall apply to
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