1、 Standard ECMA-213 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Recall Supplementary Service Phone: +41 22 849.60.00 - Fax: +41 22 849.60.01 - URL: http:/www.ecma.c
2、h - Internet: helpdeskecma.ch . Standard ECMA-213 3rd Edition - December 2001 Standardizing Information and Communication Systems Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Recall Supplementary Service (RESD) Phone: +41 22 849.60.00 - Fax: +4
3、1 22 849.60.01 - URL: http:/www.ecma.ch - Internet: helpdeskecma.ch IW Ecma-213.doc 14-01-02 15,44 . Brief History This Standard is one of a series of ECMA Standards defining services and signalling protocols applicable to Private Integrated Services Networks (PISNs). The series uses ISDN concepts a
4、s developed by ITU-T and conforms to the framework of International Standards for Open Systems Interconnection as defined by ISO/IEC. This particular Standard specifies the Recall supplementary service. This Standard is based upon the practical experience of ECMA member companies and the results of
5、their active and continuous participation in the work of ISO/IEC JTC1, ITU-T, ETSI and other international and national standardization bodies. It represents a pragmatic and widely based consensus. Compared to the 1st Edition of Standard ECMA-213 (published by ECMA in December 1994), the 2nd Edition
6、 (published by ECMA in June 1997) incorporated changes in order to achieve complete alignment with International Standard ISO/IEC 15051:1997(E) published by ISO/IEC in May 1997. Adopted as 3rd Edition of Standard ECMA-213 by the General Assembly of December 2001. - i - Table of contents 1 Scope 1 2
7、Conformance 1 3 References (normative) 1 4 Definitions 1 4.1 External definitions 1 4.2 Other definitions 2 4.2.1 Busy 2 4.2.2 Call, basic call 2 4.2.3 Recall busy 2 4.2.4 Recall busy timer 3 4.2.5 Recall no answer 3 4.2.6 Recall no answer timer 3 4.2.7 Served user 3 4.2.8 Waiting at busy user 3 5 L
8、ist of acronyms 3 6 SS-RE stage 1 specification 3 6.1 Description 3 6.1.1 General description 3 6.1.2 Qualifications on applicability to telecommunication services 3 6.2 Procedures 4 6.2.1 Provision/withdrawal 4 6.2.2 Normal procedures 4 6.2.3 Exceptional procedures 4 6.3 Interactions with other sup
9、plementary services and ANFs 5 6.3.1 Calling line identification presentation (SS-CLIP) 5 6.3.2 Connected line identification presentation (SS-COLP) 5 6.3.3 Calling/connected line identification restriction (SS-CLIR) 5 6.3.4 Calling name identification presentation (SS-CNIP) 5 6.3.5 Connected name i
10、dentification presentation (SS-CONP) 5 6.3.6 Calling/connected name identification restriction (SS-CNIR) 5 6.3.7 Call forwarding unconditional (SS-CFU) and Call deflection immediate (SS-CDI) 5 6.3.8 Call forwarding busy (SS-CFB) 5 6.3.9 Call forwarding no reply (SS-CFNR) and Call deflection from ale
11、rting (SS-CDA) 5 6.3.10 Do-not-disturb (SS-DND) 5 6.3.11 Do-not-disturb override (SS-DNDO) 5 6.3.12 Call completion to busy subscriber (SS-CCBS) 5 6.3.13 Call completion on no reply (SS-CCNR) 5 6.3.14 Call offer (SS-CO) 6 - ii - 6.3.15 Call transfer (SS-CT) 6 6.3.16 Path replacement (ANF-PR) 6 6.3.1
12、7 Call intrusion (SS-CI) 6 6.3.18 Advice of charge (SS-AOC) 6 6.3.19 Call interception (ANF-CINT) 6 6.4 Interworking considerations 6 6.5 Overall SDL 6 7 SS-RE stage 2 specification 8 7.1 Functional model 8 7.1.1 Functional model description 8 7.1.2 Description of functional entities 8 7.1.3 Relatio
13、nship of functional model to basic call functional model 8 7.2 Information flows 9 7.2.1 Definition of information flows 9 7.2.2 Relationship of information flows to Basic Call information flows 9 7.2.3 Example of information flow sequences 10 7.3 Functional entity actions 10 7.3.1 Functional entity
14、 actions of FE1 10 7.3.2 Functional entity actions of FE2 10 7.3.3 Functional entity actions of FE3 11 7.3.4 Functional entity actions of FE4 11 7.4 Functional entity behaviour 11 7.4.1 Behaviour of FE1 11 7.4.2 Behaviour of FE2 11 7.4.3 Behaviour of FE3 13 7.4.4 Behaviour of FE4 13 7.5 Allocation o
15、f functional entities to physical equipment 14 1 Scope This Standard specifies supplementary service Recall (SS-RE), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ECMA-142. SS-RE is a supplementary service whic
16、h provides for the redirection of a call transferred by the served user back to the served user if the call is unanswered. SS-RE is only applicable after transfer by join, not after transfer by rerouteing. Service specifications are produced in three stages, according to the method described in ETS
17、300 387. This Standard contains the stage 1 and stage 2 specifications of SS-RE. The stage 1 specification (clause 6) specifies the supplementary service as seen by users of PISNs. The stage 2 specification (clause 7) identifies the functional entities involved in the supplementary service and the i
18、nformation flows between them. 2 Conformance In order to conform to this Standard, a Stage 3 standard shall specify signalling protocols and equipment behaviour that are capable of being used in a PISN which supports the supplementary service specified in this Standard. This means that, to claim con
19、formance, 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 which, thr
20、ough 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 the possibility of applying the most recent editions of the standards indicated below. In the case of references
21、to ECMA Standards that are aligned with ISO/IEC International Standards, the number of the appropriate ISO/IEC International Standard is given in brackets after the ECMA reference. ECMA-133 Private Integrated Services Network (PISN) - Reference Configuration for PISN Exchanges (PINX) (International
22、Standard ISO/IEC 11579-1) ECMA-142 Private Integrated Services Network (PISN) - Circuit-mode 64 kbit/s Bearer Services - Service Description, Functional Capabilities and Information Flows (International Standard ISO/IEC 11574) ECMA-177 Private Integrated Services Network (PISN) - Specification, Func
23、tional Model and Information Flows - Call Transfer Supplementary Service (International Standard ISO/IEC 13865) ETS 300 387 Private Telecommunication Network (PTN); Method for the specification of basic and supplementary services (1994) ITU-T Rec. I.112 Vocabulary of terms for ISDNs (1993) ITU-T Rec
24、. 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 (1999) 4 Definitions For the purposes of this Standard, the followin
25、g definitions apply. 4.1 External definitions This Standard uses the following terms defined in other documents: Basic Service (ITU-T Rec. I.210) - 2 - Connection (ITU-T Rec. I.112) Network Determined User Busy (ITU-T Rec. I.221) Primary Call (ECMA-177) Private Integrated Services Network (PISN) (EC
26、MA-133) Private Integrated services Network eXchange (PINX) (ECMA-133) Secondary Call (ECMA-177) Service (ITU-T Rec. I.112) Signalling (ITU-T Rec. I.112) Supplementary Service (ITU-T Rec. I.210) User (ECMA-142) User A (ECMA-177) User B (ECMA-177) User C (ECMA-177) User Determined User Busy (ITU-T Re
27、c. I.221) This Standard refers to the following basic call functional entities (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 r3 This Standard refers to the following basic call
28、information flows defined in ECMA-142: Report request/indication Setup request/indication Setup response/confirmation This Standard refers to the following basic call information flow elements defined in ECMA-142: Connected Number (CN) Connected Subaddress (CS) 4.2 Other definitions 4.2.1 Busy A pro
29、perty of a user for whom either a Network Determined User Busy or a User Determined User Busy condition exists. 4.2.2 Call, basic call An instance of the use of a basic service. 4.2.3 Recall busy The redirection of a transferred call back to the served user if the call is waiting at a busy user C an
30、d user C remains busy. - 3 - 4.2.4 Recall busy timer A timer governing the period that a transferred call will wait at a busy user C before Recall busy occurs. The value of this timer is implementation specific. 4.2.5 Recall no answer The redirection of a transferred call back to the served user if
31、user C is being alerted and does not answer. 4.2.6 Recall no answer timer A timer governing the period that a transferred call will alert user C before Recall no answer occurs. The value of this timer is implementation specific. 4.2.7 Served user A User A that is provided with SS-RE. 4.2.8 Waiting a
32、t busy user A call state in which a call is awaiting answer at a user that is busy on another call. NOTE This can arise, for example, as a result of the use of supplementary service Call Offer (SS-CO) during call establishment. A call that is waiting on busy can be transferred. 5 List of acronyms AN
33、F Additional Network Feature CC Call Control (functional entity) CCA Call Control Agent (functional entity) CN Connected Number CS Connected Subaddress DC Destination Category FE Functional Entity ISDN Integrated Services Digital Network PINX Private Integrated services Network eXchange PISN Private
34、 Integrated Services Network SDL Specification and Description Language SS-RE Supplementary Service Recall TE Terminal Equipment 6 SS-RE stage 1 specification 6.1 Description 6.1.1 General description When the served user has a call established with user B and transfers that call to user C, SS-RE en
35、ables user B to be re-connected to the served user either if user C is being alerted and does not reply within a specified period (recall no answer), or if the call is waiting at busy user C and user C remains busy for a specified period (recall busy). An implementation may provide either of these v
36、ariants or both. NOTE If the served user fails to respond to the incoming re-directed call, the call may be cleared or subjected to other action which is beyond the scope of this specification. 6.1.2 Qualifications on applicability to telecommunication services SS-RE is applicable to all basic servi
37、ces defined in ECMA-142. - 4 - 6.2 Procedures 6.2.1 Provision/withdrawal SS-RE may be provided after pre-arrangement with the service provider, or may be available generally to all users. SS-RE may be withdrawn on request of the user or for administrative reasons. The subscription parameters and val
38、ues offered by a PISN shall be an implementation matter. A PISN may offer more or less parameters and values than those specified below. Table 1 - SS-RE Subscription parameters Subscription option Value Recall no answer select or de-select Recall busy select or de-select 6.2.2 Normal procedures 6.2.
39、2.1 Activation/deactivation/registration/interrogation Not applicable. 6.2.2.2 Invocation and operation SS-RE may be invoked by the PISN on behalf of the served user in conjunction with a call transfer, if the secondary call is not in the active state. NOTE The invocation of SS-RE may be dependent u
40、pon call type and/or other factors that are beyond the scope of this Standard. If the secondary call is waiting at busy user C at the time of call transfer and if Recall busy is applicable, then the recall busy timer shall be started. If user C becomes not busy and starts to be alerted before the re
41、call busy timer expires, Recall busy shall be cancelled. If user C is being alerted at the time of call transfer, or was busy and subsequently starts to be alerted, and if Recall no answer is applicable, then the recall no answer timer shall be started. For both Recall busy and Recall no answer, if
42、user C answers within the recall timer limit SS-RE shall be cancelled. If the recall busy timer expires before user C accepts the call or starts to be alerted, or the recall no answer timer expires before user C accepts the call, then the primary call shall be redirected to the served user, and user
43、 Bs connection with user C shall be cleared either immediately or when the served user starts to be alerted. The served user shall receive a notification that recall takes place, together with the recall reason plus the identity of user C, if available and presentation is not restricted. If user Cs
44、number is not available or its presentation is restricted, the original called number of the secondary call shall be indicated instead. User B shall be notified when recall takes place and, if the served user is being alerted, also when the served user answers; the notification shall include the ser
45、ved users identity, unless presentation is restricted and user B has no override capability. 6.2.3 Exceptional procedures 6.2.3.1 Activation/deactivation/registration/interrogation Not applicable. 6.2.3.2 Invocation and operation If the redirection of the primary call fails, e.g. because the served
46、user is busy, the transferred call may continue waiting at user C or alerting user C, whichever is applicable. If it does not continue, or if the served user does not answer the incoming redirected call, additional means to complete the call may be provided as an implementation option. - 5 - NOTE Th
47、ese additional means are beyond the scope of this Standard. 6.3 Interactions with other supplementary services and ANFs Interactions with other supplementary services and ANFs for which PISN standards were available at the time of publication of this Standard are specified below. 6.3.1 Calling line
48、identification presentation (SS-CLIP) When recall busy or no answer takes place user Bs identity shall be presented to the served user by means of SS-CLIP, provided no restriction applies. 6.3.2 Connected line identification presentation (SS-COLP) No interaction. 6.3.3 Calling/connected line identif
49、ication restriction (SS-CLIR) If SS-CLIR applies to any of the involved users number this number shall not be presented in the context of SS-RE, unless the receiving user has override capability. 6.3.4 Calling name identification presentation (SS-CNIP) When recall busy or no answer takes place user Bs name shall, if available, be presented to the served user by means of SS-CNIP, provided no restriction applies. 6.3.5 Connected name identification presentation (SS-CONP) No interaction. 6.3.6 Calling/connected name identification rest
