1、DIN1 DIN ETS 300358 96 2794442 0560546 8bT = DEUTSCHE NORM April 1996 - DIN ISDN Dienstmerkmal “Rckruf bei Besetzt” Funktionsverteilung und Informationsaustausch ETS 300358 Englische Fassung ETS 300358 : 1995 ICs 33.080 Deskriptoren: ISDN, Dienst, Rckruf, Funktion, Informationsaustausch Integrated S
2、ervices Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCBS) supplementary service - Functional capabilities and information flows; English version ETS 300358 : 1995 Die Europische Telekommunikationsnorm ETS 300358 : 1995 hat den Status einer Deutschen Norm. Nationales Vorwort Die
3、vorliegende Norm ist auf der Grundlage der vom Europischen Institut fr Telekommunika- tionsnormen (ETSI) herausgegebenen Europischen Telekommunikationsnorm ETS 300358, Ausgabe September 1995, “Integrated Services Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCBS) supplementary se
4、rvice - Functional capabilities and information flows“, verffentlicht worden. Diese Norm enthlt unter BerSlckcichtigung des DIN-Prsidialbeschlues 13/1983 den englischen Originaltext der vom Technischen Unterkomitee SPS 1 des ETSI erarbeiteten ETS 300358. Fachlich zustndig in Deutschland kt das Unter
5、komitee 723.2 Telekommunikationsdienste (Implementationssicht)” der Deutschen Elekotechnischen Kommission im DIN und WE (DKE). Fortsetzung 64 Seiten ETS-Original Deutsche Elektrotechnische Kommission im DIN und VDE (DKE) 0 DIN Deutsches Institut fr Normung e.V. Jede Art der Vervielfaltigung, auch au
6、szugsweise, Ref. NL DIN ETS 300358 : 1996-04 nur mit Genehmigung des DIN Deutsches Institut fr Normung e.V., Berlin, gestattet. PreisgL 22 VertL-NI: 1722 Alleinverkauf der Normen durch Beuth Verlag GmbH, 10772 Berlin DINI DIN ETS 300358 96 2794442 0560547 7Tb ETS 300 358 September 1995 Source: ETSI
7、TC-SPS Reference: T/S 22-08 ICs: 33.080 Key words: ISDN, supplementary service Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Functional capabilities and information flows ETSI European Telecornmunications Standards Institute ETSI Sec
8、retariat Postai address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c = fr, a = atlas, p =etsi, s =secretariat - Internet: secretariatetsi.fr Tel.: + 33 92 94 42 O0 - Fax: + 33 93 65 47 16 Copyright Notification: No pa
9、rt may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. 8 European Telecommunications Standards Institute 1 995. All rights reserved. DIN1 DIN ETS 300358 96 2794442 0560548 632 M Page 2 ETS 300 358: September 1
10、995 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. DIN1 DI
11、N ETS 300358 9b 2794442 05b0549 579 Page 3 ETS 300 358: September 1995 Contents Foreword . 5 1 Scope . 7 2 Normative references 7 3 Definitions . 8 4 Symbols and abbreviations . 9 5 Description 9 6 Derivation of a functional model 9 6.1 Functional model description 9 6.2 Description of functional en
12、tities 10 6.3 Relation with a basic service 10 7 Information flows . 10 Information flow diagrams . 10 Definition of individual information flows . 16 7.1 7.2 7.2.1 7.2.2 7.2.3 Relationship ra 16 7.2.1.1 Contents of CCBS ACTIVATE 16 7.2.1.2 Contents of CCBS ACTIVATE REJECT 16 7.2.1.3 Contents of CCB
13、S INTERROGATE 16 7.2.1.4 Contents of CCBS INTERROGATE REJECT 17 7.2.1.5 Contents of CCBS DEACTIVATE 17 7.2.1.6 Contents of CCBS DEACTIVATE REJECT 17 7.2.1.7 Contents of REMOTE USER FREE . 18 7.2.1.8 Contents of B FREE 18 7.2.1.9 Contents of CCBS CALL 19 7.2.1.10 Contents of CCBS CALL REJECT 19 7.2.1
14、.1 1 Contents of CCBS CANCELLED 19 7.2.1.12 Contents of STATUS 20 Relationship rb 20 7.2.2.1 Contents of CCBS REQUEST . 20 7.2.2.2 Contents of CCBS REQUEST REJECT 21 7.2.2.3 Contents of REMOTE USER FREE . 21 7.2.2.4 Contents of CCBS SUSPEND . 21 7.2.2.5 Contents of CCBS RESUME . 21 7.2.2.6 Contents
15、of CCBS CANCEL . 21 7.2.2.7 Contents of CCBS CALL 22 7.2.2.8 Contents of CCBS AVAILABLE . 22 Relationship rc. . 22 7.2.3.1 Contents of STATUS 22 8 SDL diagrams for functional entities 22 SDL diagrams for FE3 . 44 8.1 8.2 8.3 8.4 SDL diagrams for FE1 . 23 SDL diagrams for FE2 . 30 SDL diagrams for FE
16、4 . 56 9 Functional Entity Actions (FEAS) . 59 FEAs of FE1 59 9.1 FEAs of FE2 59 9.2 DIN1 DIN ETS 300358 76 = 2774442 0560550 270 Page 4 ETS 300 358: September 1995 9.3 9.4 FEAS of FE3 . 61 FEAS of FE4 . 62 1 O Network physical location scenarios . 63 History . 64 DIN1 DIN ETS 300358 96 W 2794442 05
17、60553 327 W Page 5 ETS 300 358: September 1995 Foreword This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI). In accordance with CCITT Recommendation 1.130, t
18、he following three level structure is used to describe the supplementary telecommunication services as provided by European public telecommunications operators under the pan-European Integrated Services Digital Network (ISDN): - Stage 1 : is an overall service description, from the users standpoint;
19、 - Stage 2: identifies the functional capabilities and information flows needed to support the service described in stage 1 ; and - Stage 3: defines the signalling system protocols and switching functions needed to implement the service described in stage 1. This ETS details the stage 2 aspects (fun
20、ctional capabilities and information flows) needed to support the Completion of Calls to Busy Subscriber (CCBS) supplementary service. The stage 1 aspects are detailed in ETS 300 357 and the stage 3 aspects are detailed in ETS 300 359-1 and ETS 300 356-1 8. Transposition dates Date of adoption of th
21、is ETS: Date of latest announcement of this ETS (doa): 29 September 1995 31 December 1995 Date of latest publication of new National Standard or endorsement of this ETS (dop/e): 30 June 1996 I I Date of withdrawal of any conflicting National Standard (dow): 30 June 1996 DINI DIN ETS 300358 96 279444
22、2 0560552 Ob3 Page 6 ETS 300 358: September 1995 Blank page DIN1 DIN ETS 300358 96 H 2794442 0560553 TTT Page 7 ETS 300 358: September 1995 1 Scope This European Telecommunication Standard (ETS) defines the stage two of the Completion of Calls to Busy Subscriber (CCBS) supplementary service for the
23、pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators. Stage two identifies the functional capabilities and the information flows needed to support the service as described in stage one. The stage two description also identifies user oper
24、ations not directly associated with a call (see CCITT Recommendation 1.130 3). This ETS is specified according to the methodology specified in CCITT Recommendation Q.65 161. This ETS does not formally describe the relationship between this supplementary service and the basic call but, where possible
25、, the information is included for guidance. In addition, this ETS does not specify the requirements where the service is provided to the user via a private ISDN. This ETS does not specify the requirements for the allocation of defined functional entities within a private ISDN; it does however define
26、 which functional entities may be allocated to a private ISDN. This ETS does not specify the additional requirements where the service is provided to the user via a telecommunication network that is not an ISDN. The CCBS supplementary service enables user A, encountering a busy destination B, to hav
27、e the call completed without having to make a new call attempt when the destination B becomes not busy. The CCBS supplementary service is applicable to all circuit-switched telecommunication services. This ETS is applicable to the stage three standards for the ISDN CCBS supplementary service. The te
28、rm “stage three“ is also defined in CCITT Recommendation 1.130 131. Where the text indicates the status of a requirement, .e. as a strict command or prohibition, as authorization leaving freedom, as a capability or possibility, this shall be reflected in the text of the relevant stage two and stage
29、three standards. Furthermore, conformance to this ETS is met by conforming to the stage three standards with the field of application appropriate to the equipment being implemented. Therefore, no method of testing is provided for this ETS. 2 Normative references This ETS incorporates by dated or und
30、ated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this ETS only when incorporated
31、in it by amendment or revision. For undated references the latest edition of the publication referred to applies. I 1 CCITT Recommendation E.164 (1991 1: “Numbering plan for the ISDN era“. i 21 ITU-T Recommendation 1.1 12 (1 993): “Vocabulary of terms for ISDNs“. i31 141 i51 CCITT Recommendation 1.1
32、 30 (1 988): “Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN“. ITU-T Recommendation 1.21 O (1 993): “Principles of telecommunication services supported by an ISDN and the means used to describe them“. ITU-T Recommendation 1.221
33、(1 993): “Common specific characteristics of services“. DIN1 DIN ETS 300358 96 W 2794442 0560554 93b Page 8 ETS 300 358: September 1995 i61 171 i81 CCITT Recommendation 0.65 (1988): “Stage 2 of the method for the characterization of services supported by an ISDN“. CCITT Recommendation 0.71 (1988): “
34、ISDN 64 kbit/s circuit mode switched bearer services“. CCITT Recommendation Z. 1 O0 (1 988): “Specification Description Language ( S DL) “ . 3 Definitions For the purposes of this ETS, the following definitions apply: called party address: Called party identity, consisting of the called party number
35、 and subaddress if avail able. calling party address: Calling user identity, consisting of the calling party number and subaddress if available. busy: See CCITT Recommendation 1.221 5, subclause 2.1.3. CCBS busy: Any one of the following conditions will cause a CCBS busy condition: maximum number of
36、 calls reached at user A; no B-channels available at user A; CCBS recall pending on user A. - CCBS call: A call generated by the network from user A to destination B resulting from user As acceptance of a CCBS recall. CCBS identifier: Identifier used for linking the CCBS-processes in FE1 and FE2, an
37、d also for linking to the call control for the CCBS call. CCBS recall: An indication informing user A that the network is ready to initiate a CCBS call to destination B and that the network is awaiting a response to this indication. CCBS recall timer: The maximum time the network will wait for user
38、A to respond to a CCBS recall. The value of this timer shall be a minimum of 10 seconds and a maximum of 20 seconds. CCBS request: An instance of an activation of the CCBS supplementary service which is held in a queue pending the correct conditions for the CCBS supplementary service to be completed
39、. CCBS service duration timer: The maximum time the CCBS supplementary service will remain activated for user A within the network. The value of this timer shall be a minimum of 15 minutes and a maximum of 45 minutes. compatible terminal: A terminal which can support the bearer service or teleservic
40、e requested for the original call to destination B and which can accept calls to the ISDN number and subaddress identifying the called user in the original call to destination B. destination B: The entity addressed in the original call. destination B idle guard timer: The time the network will wait
41、after destination B has become not busy before informing user A. The value of this timer shall be a maximum of 15 seconds. identical requests: Requests with identical bearer service requirements, teleservice requirements, destination selection information and calling user identity (if any). Integrat
42、ed Services Digital Network (ISDNI: see ITU-T Recommendation 1.1 12 21, definition 308. DIN1 DIN ETS 300358 96 = 2794442 0560555 872 m Page 9 ETS 300 358: September 1995 retention timer: This timer specifies the amount of time that the network retains all of the information supplied by the calling u
43、ser when the call encounters busy. This timer is part of the basic call procedures. Although this timer is optional for the basic call procedures, it is needed for the operation of the CCBS supplementary service. The value shall be greater than 15 seconds. service; telecommunication service: See ITU
44、-T Recommendation I. 1 1 2 121, definition 201 subaddress: See CCITT Recommendation E.164 111, subclause 11.2. supplementary service: See ITU-T Recommendation 1.21 O 41, subclause 2.4. user A: The user who originated the call and to whom the CCBS supplementary service is provided. 4 Symbols and abbr
45、eviations For the purposes of this ETS, the following abbreviations apply: BC CCBS FEA H LC ISDN LE LLC MSN OCE OSA PTNX SDL SUB TCE TE TSA Bearer Capability Completion of Calls to Busy Subscriber Functional Entity Action High Layer Compatibility Integrated Services Digital Network Local Exchange Lo
46、w Layer Compatibility Multiple Subscriber Number Originating Service Controlling Functional Entity Originating Service Agent Private Telecommunication Network exchange Specification and Description Language Su baddressing Terminating Service controlling Functional Entity Terminal Equipment Terminati
47、ng Service Agent 5 Description When user A encounters a busy destination B, user A can request the CCBS supplementary service. The network will then monitor the wanted destination B for becoming not busy. When the wanted destination B becomes not busy he. access resources, e.g. at least one B-channe
48、l, are not busy) and a compatible terminal can accept the call, then the network will wait a short time in order to allow the resources to be re-used for making an outgoing call. If the resources are not re-used within this time, then the network will automatically recall the user A. When user A acc
49、epts the CCBS recall, then the network will automatically generate a CCBS call to destination B. 6 Derivation of a functional model 6.1 Functional model description The functional model is given in figure 1. Figure 1: Functional model DIN1 DIN ETS 300358 96 2794442 0560556 709 Page 10 ETS 300 358: September 1995 6.2 Description of functional entities FE1 CCA The Functional Entities (FES) required by the CCBS supplementary service in addition to those of the basic call are as follows: ra FE2 r- FE3 rc- cc cc cc FE1 : FE2: FE3: FE4: Originating Service Agent (OSA);
