1、Standard ECMA-1912nd Edition - June 1997Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chPrivate Integrated Services Network(PISN) -Specification, Functional Model andInformation Flows -Call Offer S
2、upplementary Service.Standard ECMA-1912nd Edition - June 1997Standardizing Information and Communication SystemsPhone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.chIW Ecma-191.doc 14-07-98 16,25Private Integrated Services Network(PISN) -Specification,
3、Functional Model andInformation Flows -Call Offer Supplementary Service(COSD).Brief HistoryThis Standard is one of a series of ECMA Standards defining services and signalling protocols applicable to Private IntegratedServices Networks (PISNs). The series uses ISDN concepts as developed by ITU-T and
4、conforms to the framework ofInternational Standards for Open Systems Interconnection as defined by ISO/IEC. It has been produced under ITSTC workitem M-IT-05 2.2 and under ETSI work item DE/ECMA-00008.This particular Standard specifies the Call Offer (CO) supplementary service.This Standard is based
5、 upon the practical experience of ECMA member companies and the results of their active andcontinuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardizationbodies. It represents a pragmatic and widely based consensus.There is currently no equivale
6、nt service specified by ITU-T or ETSI for public ISDNs.Compared to the 1st Edition of Standard ECMA-191 (published by ECMA in June 1993), this 2nd Edition incorporateschanges in order to achieve complete alignment with International Standard ISO/IEC 14841:1996(E) published by ISO/IEC inSeptember 199
7、6.Adopted as 2nd Edition of Standard ECMA-191 by the General Assembly of June 1997.- i -Table of contents1 Scope 12 Conformance 13 References (normative) 14 Definitions 24.1 External definitions 24.2 Other definitions 24.2.1 Additional network feature 24.2.2 Automatic call offer invocation timer 24.
8、2.3 Busy 34.2.4 Call, basic call 34.2.5 Consultation timer 34.2.6 Offered call 34.2.7 Path retention 35 Acronyms 36 SS-CO stage 1 specification 46.1 Description 46.1.1 General description 46.1.2 Qualifications on applicability to telecommunication services 46.2 Procedures 46.2.1 Provision/withdrawal
9、 46.2.2 Normal procedures 46.2.3 Exceptional procedures 56.3 Interactions with other supplementary services and ANFs 56.3.1 Calling Line Identification Presentation (SS-CLIP) 56.3.2 Connected Line Identification Presentation (SS-COLP) 56.3.3 Calling/Connected Line Identification Restriction (SS-CLIR
10、) 66.3.4 Calling Name Identification Presentation (SS-CNIP) 66.3.5 Connected Name Identification Presentation (SS-CONP) 66.3.6 Calling/Connected Name Identification Restriction (SS-CNIR) 66.3.7 Completion of Calls to Busy Subscriber (SS-CCBS) 66.3.8 Completion of Calls on No Reply (SS-CCNR) 66.3.9 C
11、all Transfer (SS-CT) 66.3.10 Call Forwarding Unconditional (SS-CFU) 66.3.11 Call Forwarding Busy (SS-CFB) 66.3.12 Call Forwarding No Reply (SS-CFNR) 66.3.13 Call Deflection (SS-CD) 66.3.14 Path Replacement (ANF-PR) 76.3.15 Do Not Disturb (SS-DND) 7- ii -6.3.16 Do Not Disturb Override (SS-DNDO) 76.3.
12、17 Call Intrusion (SS-CI) 76.4 Interworking considerations 76.5 Overall SDL 77 SS-CO stage 2 specification 127.1 Functional model 127.1.1 Functional model description 127.1.2 Description of functional entities 137.1.3 Relationship of functional model to basic call functional model 137.2 Information
13、flows 147.2.1 Definition of information flows 147.2.2 Relationship of information flows to basic call information flows 157.2.3 Examples of information flow sequences 167.3 Functional entity actions 267.3.1 Functional entity actions of FE1 267.3.2 Functional entity actions of FE2 267.4 Functional en
14、tity behaviour 267.4.1 Behaviour of FE1 267.4.2 Behaviour of FE2 337.5 Allocation of functional entities to physical equipment 367.6 Interworking considerations 361ScopeThis Standard specifies the Call Offer supplementary service (SS-CO), which is applicable to various basic servicessupported by Pri
15、vate Integrated Services Networks (PISN). Basic services are specified in ECMA-142.Call Offer (SS-CO) is a supplementary service which, on request from the calling user (or on that users behalf),enables a call to be offered to a busy called user and to wait for that called user to accept this call.S
16、upplementary service specifications are produced in three stages, according to the method described in ETS 300 387.This Standard contains the stage 1 and stage 2 specifications of SS-CO. The stage 1 specification (clause 6) specifiesthe supplementary service as seen by users of PISNs. The stage 2 sp
17、ecification (clause 7) identifies the functionalentities involved in the supplementary service and the information flows between them.NOTE 1For this Standard, stage 2 does not consider the split of functionality between a functional terminal and the localPINX. Terminal functions and local PINX funct
18、ions are included in the same functional entity.2 ConformanceIn order to conform to this Standard, a stage 3 standard shall specify signalling protocols and equipment behaviour thatare capable of being used in a PISN which supports the supplementary service specified in this Standard. This meansthat
19、, to claim conformance, a stage 3 standard is required to be adequate for the support of those aspects of clause 6(stage 1) and clause 7 (stage 2) which are relevant to the interface or equipment to which the stage 3 standard applies.3 References (normative)The following standards contain provisions
20、 which, through reference in this text, constitute provisions of this Standard.All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below.In the case of ref
21、erences to ECMA Standards that are aligned with ISO/IEC International Standards, the number of theappropriate ISO/IEC International Standard is given in brackets after the ECMA reference.ECMA-142 Private Integrated Services Network - Circuit-mode 64 kbit/s Bearer Services - ServiceDescription, Funct
22、ional Capabilities and Information Flows (International StandardISO/IEC 11574)ECMA-148 Private Integrated Services Network - Specification, Functional Model and Information Flows -Identification Supplementary Services (International Standard ISO/IEC 14136)ECMA-163 Private Integrated Services Network
23、 - Specification, Functional Model and Information Flows -Name Identification Supplementary Services (International Standard ISO/IEC 13864)ECMA-173 Private Integrated Services Network - Specification, Functional Model and Information Flows -Call Diversion Supplementary Services (International Standa
24、rd ISO/IEC 13872)ECMA-177 Private Integrated Services Network - Specification, Functional Model and Information Flows -Call Transfer Supplementary Service (International Standard ISO/IEC 13865)ECMA-185 Private Integrated Services Network - Specification, Functional Model and Information Flows -Call
25、Completion Supplementary Services (International Standard ISO/IEC 13866)ECMA-193 Private Integrated Services Network - Specification, Functional Model and Information Flows -Do Not Disturb and Do Not Disturb Override Supplementary Services (International StandardISO/IEC 14842)ISO/IEC 11579-1 Informa
26、tion technology - Telecommunications and information exchange between systems -Private Integrated Services Network - Part 1: Reference configuration for PISN Exchanges(PINX)ETS 300 387 Private Telecommunication Network (PTN); Method for the specification of basic andsupplementary services (1994)- 2
27、-ITU-T Rec. I.112 Vocabulary of terms for ISDNs (1993)ITU-T Rec. I.210 Principles of telecommunication services supported by an ISDN and the means to describe them(1993)ITU-T Rec. I.221 Common specific characteristics of services (1993)ITU-T Rec. Z.100 Specification and description language (1993)4
28、DefinitionsFor the purposes of this Standard, the following definitions apply.4.1 External definitionsThis Standard uses the following terms defined in other documents: Basic service (ITU-T Rec. I.210) Connection (ITU-T Rec. I.112) Network Determined User Busy (ITU-T Rec. I.221) Private Integrated S
29、ervices Network (PISN) (ISO/IEC 11579-1) Private Integrated Services Network Exchange (PINX) (ISO/IEC 11579-1) Service (ITU-T Rec. I.112) Signalling (ITU-T Rec. I.112) Supplementary Service (ITU-T Rec. I.210) User (ECMA-142) User Determined User Busy (ITU-T Rec. I.221)This Standard refers to the fol
30、lowing basic call functional entity (FEs) defined in ECMA-142: Call Control (CC) Call Control Agent (CCA)This Standard refers to the following basic call inter-FE relationships defined in ECMA-142: r1 r2 r3This Standard refers to the following basic call information flows defined in ECMA-142: Releas
31、e request/indication Release response/confirmation Report request/indication Setup request/indication Setup response/confirmation.4.2 Other definitions4.2.1 Additional network featureA capability, over and above that of a basic service, provided by a PISN, but not directly to a PISN user.4.2.2 Autom
32、atic call offer invocation timerA timer governing the time after which SS-CO is automatically invoked after the calling user has been informedthat a call has failed because of busy at the destination. The duration of the timer is an implementation option.- 3 -4.2.3 BusyA property of a user for whom
33、either a Network Determined User Busy or User Determined User Busy conditionexists.4.2.4 Call, basic callAn instance of the use of a basic service.4.2.5 Consultation timerA timer governing the time in which the calling user is allowed to request invocation of SS-CO after beinginformed that a call ha
34、s failed because of busy at the destination. The duration of the timer is an implementationoption.4.2.6 Offered callA call that is in a waiting condition as a result of invocation of SS-CO against a busy called user.4.2.7 Path retentionThe retaining of the network connection between the Originating
35、CC and the Destination CC so that asupplementary service (such as SS-CO) can be invoked without establishing a new connection.5 AcronymsANF Additional Network FeatureCC Call Control (functional entity)CCA Call Control Agent (functional entity)CCBS Call Completion to Busy SubscriberCCNR Call Completi
36、on on No ReplyCD Call DeflectionCFB Call Forwarding BusyCFNR Call Forwarding No ReplyCFU Call Forwarding UnconditionalCLIP Calling Line Identification PresentationCLIR Calling/Connected Line Identification RestrictionCNIP Calling Name Identification PresentationCNIR Calling/Connected Name Identifica
37、tion RestrictionCO Call OfferCOLP Connected Line Identification PresentationCONP Connected Name Identification PresentationCT Call TransferDND Do Not DisturbDNDO Do Not Disturb OverrideFE Functional EntityISDN Integrated Services Digital NetworkPR Path ReplacementPINX Private Integrated Services Net
38、work ExchangePISN Private Integrated Services NetworkSDL Specification and Description Language- 4 -SS Supplementary ServiceTE Terminal Equipment6 SS-CO stage 1 specification6.1 Description6.1.1 General descriptionSS-CO is a supplementary service which, on request from the calling user (or on that u
39、sers behalf), enables a callto be offered to a busy called user and to wait for that called user to accept the call, after the necessary resourceshave become available.The busy called user is given an indication of the offered call. During the time that the call is offered, the calleduser may ignore
40、 the offered call or may attempt to make the necessary resources available (e.g. by releasing orplacing on hold another call). When and if the necessary resources become available, the call shall be completedas a normal incoming call.6.1.2 Qualifications on applicability to telecommunication service
41、sSS-CO is applicable to all basic services defined in ECMA-142.6.2 Procedures6.2.1 Provision/withdrawalSS-CO may be provided or withdrawn after pre-arrangement with the service provider (by means of serviceprofile control), or may be available generally to all users. In a PISN that offers more than
42、one way of invokingSS-CO (see 6.2.2.2), one or more of these ways shall be selected at provision time.6.2.2 Normal procedures6.2.2.1 Activation/deactivation/registration/interrogationNot applicable.6.2.2.2 Invocation and operationThere are four different ways of invoking SS-CO. A PISN shall offer on
43、e or more of these ways. These waysare:1. Network invocation (immediate): the PISN shall automatically invoke SS-CO whenever the calling usermakes a call to a user that is busy, if required by the service profile of the calling user.2. Consultation: the calling user, on being informed that a call ha
44、s failed because of busy at the destinationand that SS-CO may be possible, shall be able, within a defined time period (consultation timer) to requestinvocation of SS-CO.3. Immediate invocation: the calling user shall be able to request invocation of SS-CO as part of the initialcall set up.4. Networ
45、k invocation (delayed): the network, having informed the calling user that a call has failed becauseof busy at the destination, shall automatically invoke SS-CO unless the calling user initiates call clearingwithin a defined time period (automatic call offer invocation timer).NOTE 2If method 1 is pr
46、ovided to a user, methods 2, 3 and 4 will not be available to that user.For consultation and network invocation (delayed), for those basic services for which ECMA-142 requires anin-band tone or announcement to indicate progress or otherwise of the call, the information provided by thenetwork that th
47、e call has failed because of busy at the destination shall include an in-band tone orannouncement.If the calling user is provided with both consultation and network invocation (delayed), the calling user shallbe able to request SS-CO during the period of the automatic call offer invocation timer. If
48、, at the time ofexpiry of the automatic call offer invocation timer, the calling user has not requested SS-CO and has notinitiated call clearing, the network shall automatically invoke SS-CO.- 5 -On successful invocation of SS-CO, the called user shall receive an indication of the offered call, and
49、thecalling user shall be advised that SS-CO has been invoked. Additional information that would normallyaccompany an incoming call indication (see ECMA-142) may optionally be provided to the called user.During the waiting period, for those basic services for which ECMA-142 requires an in-band tone orannouncement to indicate progress or otherwise of the call, an in-band tone or announcement shall be given tothe calling user.If the PISN detects that the necessary resources have become available, it shall transfer an incoming callindication to the called user.NOTE 3Th
