1、 STD-ETSI GSM 02-91-ENGL 1777 W 3400855 OLBb030 124 GSM 02.91 March 1997 Version 5.1 .1 Source: ETSI TC-SMG Reference: TS/SMG-O10291 QR2 ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) Digital cellular telecommunications system (Phase
2、2+); Explicit Call Transfer (ECT) (GSM 02.91) ETS I European Telecommunications Standards Institute ETSI Secretariat Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretanat - Inte
3、rnet: secretariatetsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 Copyright Notification: No pari may be reproduced except as authorized by written permission The copyright and the foregoing restriction extend to reproduction in all media O European Telecommunications Standards Institute 199
4、7 All rigits reserved Page 2 GSM 02.91 version 5.1 .l : March 1997 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
5、 Support Dept.“ at the address shown on the title page. . STD-ETSI GSM 02-91-ENGL 1777 3400855 OLBb032 TT7 M Page 3 GSM 02.91 version 5.1.1: March 1997 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Definitions and abbreviations 7 3.1 Definitions 7 3.2 Abbreviations . 8 4 Description 8 A
6、pplicability to telecommunication services . 8 4.1 5 Normal operation with successful outcome . 8 5.1 Provision 8 5.2 Wrthdrawal . 8 5.3 Registration 8 5.4 Erasure 8 5.5 Activation . 8 5.6 Deactivation . 8 5.7 Invocation . 8 5.8 Normal operation . 8 5.9 Interrogation . 9 5.1 O Charging requirements
7、9 6 Exception procedures or unsuccessful outcome 9 7 Alternate procedures . 10 8 Interaction with other supplementary services 10 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 8.10 8.1 1 8.12 8.1 3 8.14 8.15 8.16 8.17 8.18 8.1 9 Calling Line Identification Presentation (CLIP) 1 0 Calling Line Identification R
8、estriction (CLIR) . 10 Connected Line Identification Presentation (COLP) 1 0 Connected Line Identification Restriction (COLR) . 11 Call Forwarding Unconditional (CFU) 11 Call Forwarding on mobile subscriber Busy (CFB) 11 Call Forwarding on No Reply (CFNRy) 11 Call Forwarding on mobile subscriber Not
9、 Reachable (CFNRc) . 11 Call Waiting (CW) 11 Call Hold (CH) 11 Multi-party (MPTY) service 12 Closed User Group (CUG) . 12 Advice of Charge (AOC) . 12 Barring of All Outgoing Calls (BAOC) 12 Barring of all Outgoing International Calls (BOIC) . 12 Barring of all Outgoing International Calls except tho
10、se direct to the Home PLMN Country (BOIC-exHC) 12 Barring of All Incoming Calls (BAIC) 12 Barring of Incoming Calls when roaming outside the home PLMN country (BIC-Roam) 12 Call Transfer (CT) 12 9 Interworking considerations . 13 Annex A (informative): Deviations of GSM ECT to the ISDN specification
11、s of ECT . 14 A.1 Subclause 4.1: Applicability to telecommunication services . 14 STD-ETSI GSM 02*7L-ENGL 1777 3400855 OLBb033 733 Page 4 GSM 02.91 version 5.1.1: March 1997 A.2 Subclause 5.8: Normal operation . 14 A.3 Subclause 6: Exception procedures or unsuccessful outcome 14 A.4 Subclauses 8.6 a
12、nd 8.7 14 AS Annexes 14 Annex B (normative): Annex C (informative): Cross Phase compatibility 15 Change history . 16 History . 17 Page 5 GSM 02.91 version 5.1.1: March 1997 Foreword This Global System for Mobile communications Technical Specification (GTS) has been produced by the Special Mobile Gro
13、up (SMG) Technical Committee (TC) of the European Telecommunications Standards institute (ETSI). This GTS specifies the stage 1 description of Explicit Call Transfer (ECT) from the service subscribers and users points of view within the digital cellular telecommunications system (Phase 2Phase 2+). T
14、he contents of this GTS are subject to continuing work within TC-SMG and may change following formal TC-SMG approval. Should TC-SMG modi the contents of this GTS it will then be republished by ETSI with an identifying change of release date and an increase in version number as follows: Version 5.x.y
15、 where: y the third digit is incremented when editorial only changes have been incorporated in the specification; x the second digit is incremented for all other types of changes, .e. technical enhancements, corrections, updates, etc. Page 6 GSM 02.91 version 5.1 .I : March 1997 Blank page Page 7 GS
16、M 02.91 version 5.1.1: March 1997 1 Scope This Global System for Mobile communications Technical Specification (GTS) specifies the stage I description of Explicit Call Transfer (ECT) from the servke subscribers and users points of view, in particular: - the procedures for normal operation with succe
17、ssful outcome; - the action to be taken in exceptional circumstances; - the interaction with other Global System for Mobile communications (GSM) supplementary services. This GTS does not deal with the Man-Machine Interface (MMI) requirements, but makes reference to the appropriate GSM Technical Spec
18、ification and ETS. The charging principles applied to ECT are established in this standard in terms of the charging information required to be collected. Any subsequent charging implications are outside of the scope of this GTS. This GTS is applicable to the digital cellular telecommunication system
19、 GSM. Any interactions with other networks not dealt with in clause 9 are outside the scope of this GTS. 2 Normative references This GTS incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the
20、publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this GTS only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. GSM O1 .O4 (ETR 350):
21、 “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. GSM 02.30 (ETS 300 907): “Digital cellular telecommunications system (Phase 2+); Man-Machine Interface (MMI) of the Mobile Station (MS)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of this GTS
22、, the following definitions apply: subscriber A: Is the served mobile subscriber, the one who has subscribed to, and invokes the Explicit Call Transfer supplementary service. subscriber 6: Is the other party in one of subscribers As calls. By convention, in this standard it is considered that the co
23、nnection has been established on this call. subscriber C: Is the other party in another of subscribers As calls. subscriber D: Is the fotwarded-to subscriber of call forwarded by subscriber C. NOTE: Each of subscriber 6, C and D can be a mobile or a fixed subscriber, and each of them is referred to
24、as “remote party“. answered state: The connection has been established on the call to the remote subscriber. alerting state: The remote subscriber is being informed of the call (Le. the connection has not yet been established for that call). STD.ETS1 GSM 02-91-ENGL 1997 3400855 OLb037 589 Page 8 GSM
25、 02.91 version 5.1.1: March 1997 successful invocation: The ECT supplementary service is successfully invoked if the outcome of all checks (e.9. subscription, states of calls, resources) performed by the network on the received ECT request from the served subscriber are successful. 3.2 Abbreviations
26、 All abbreviations used within this ETS are given in ETR 350 (GSM 01.04) l. 4 Description The ECT supplementary service enables the served mobile subscriber (subscriber A) who has two calls, each of which can be an incoming or outgoing call, to connect the other parties in the two calls and release
27、the served mobile subscribers own connection. Prior to transfer, the connection shall have been established on the call between subscriber A and subscriber B. On the call between subscriber A and subscriber C, either the connection shall have been established prior to transfer, or, as a network opti
28、on, transfer can occur while subscriber C is being informed of the call (.e. the connection has not yet been established). 4.1 Applicability to telecommunication services This service is applicable to telephony (lS:ll) only. 5 Normal operation with successful outcome 5.1 Provision The supplementary
29、service shall be provided aier pre-arrangement with the service provider. The provision of the Call Hold (CH) supplementary service is also required. 5.2 Withdrawal The supplementary service shall be withdrawn at the subscriber request or for service provider reasons. 5.3 Registration Not applicable
30、. 5.4 Erasure Not applicable. 5.5 Activation The supplementary service shall be activated by the service provider as a result of provision. 5.6 Deactivation The supplementary service shall be deactivated by the service provider as a result of withdrawal. 5.7 Invocation ECT shall be invoked by the se
31、rved mobile subscriber by use of a control procedure as described in GSM 02.30 2. 5.8 Normal operation The served mobile subscriber (subscriber A) who has two calls (one with subscriber B and one with subscriber C), each of which can be an incoming call or an outgoing call, can request the invocatio
32、n of the ECT supplementary service with respect to the two calls. Page 9 GSM 02.91 version 5.1 .I : March 1997 The connection shall have been established on one of the calls (referred to as the call between subscriber A and subscriber B). The ECT supplementary service can be invoked afler the connec
33、tion has been established on the call between subscriber A and subscriber C, and in addition, as a network option, after subscriber C has been informed of the call (.e. an outgoing call from subscriber A to subscriber C, where the connection has not yet been established). On successful invocation of
34、 the ECT supplementaty service, the two calls between subscriber A and subscriber B and between subscriber A and subscriber C respectively shall be removed from subscriber As access (.e. the traffic channel and the signalling channel towards subscriber A will be released) and shall be transformed in
35、to a normal call between subscriber B and subscriber C where the state of the previously held party is changed to active without a subscriber action. The previously held party will be informed in the normal way of the retrieve procedure. If the network option above is supported, then if subscriber C
36、 is being informed of the call from subscriber A at the time of transfer, the call shall remain in this state at subscriber C (as a network option the ringing tone will be given to subscriber B), and when the connection is established by subscriber C, subscriber C shall be connected to subscriber B.
37、 Subscriber A will no longer have any control of the on-going call between B and C. The network shall inform (if possible) subscriber B and subscriber C of the occasion that call transfer has happened including the state (connection established, or user being informed of the call) of the call to the
38、 other subscriber. If the network option above is supported, then after connection is established on a call which was transferred whilst subscriber C was being informed of that call, subscriber B shall be informed that the connection has been established on the call to subscriber C. The line identit
39、y of subscriber B shall be indicated to subscriber C as specified in subclauses 8.1 through 8.4. The line identity of subscriber C shall be indicated to subscriber B as specified in subclauses 8.1 through 8.4, either: - at the time of transfer, if the connection had been established between subscrib
40、er A and subscriber C; or - when subscriber B is informed that the connection has been established to subscriber C, if this occurs after transfer. 5.9 Interrogation Not applicable. 5.1 O Charging requirements The charging principles applicable prior to the served mobile subscribers invocation of ECT
41、, shall also apply after the ECT supplementary service is successfully invoked, .e. the same charging information will continue to be collected after invocation as before. The charging information for both calls shall contain an indication of successful invocation of ECT. NOTE: There is no additiona
42、l charging requirement on the interchange signalling capabilities. 6 Exception procedures or unsuccessful outcome If a mobile subscriber tries to invoke the call transfer service while not subscribed to or the network cannot provide ECT supplementary service for some other reason, an indication shal
43、l be provided to the mobile subscriber to notify the mobile subscriber with the reason of failure. Page 10 GSM 02.91 version 5.1 .I : March 1997 The call state is not affected and the established connection shall remain in the state prior to the request. In the case where: - the two calls are incomp
44、atible with the ECT request, .e. either one of them or both are not belonging to the service TS:ll (telephony); - if the network option is not supported and the call state is not compatible with the request, e.g. one call is not answered; the request shall be rejected by the network and the subscrib
45、er shall be notified with the reason. The call state is not affected and the established connection shall remain in the state prior to the request. The request for the ECT supplementary service shall be rejected if, as a network option, the network can determine that the resulting connection would c
46、ontain no subscriber who is able to terminate the call. NOTE: It may not be possible to decide if the resulting connection would have such a subscriber, e.g. when interworking between different versions of signalling systems occurs. In such cases, as a network option, the request for the ECT supplem
47、entary seivke may be accepted, or rejected. If the request for the ECT supplementary service is accepted in this case, the network may employ other means to control this situation (e.9. time supervision). The procedures for this are outside the scope of this standard. 7 Alternate procedures For furt
48、her study. 8 Interaction with other supplementary services 8.1 Calling Line Identification Presentation (CLIP) If subscriber A originated the call between subscribers A and B, and subscriber B subscribes to CLIP, subscriber Cs identity shall be presented to subscriber B, subject to subscriber Cs lin
49、e identification restrictions (see subclauses 8.2 and 8.4). If the connection has been established on the call between subscribers A and C before ECT is invoked, subscriber Cs identity shall be presented when ECT is invoked. If the connection is established on the call between subscribers A and C after ECT is invoked, subscriber Cs identity shall be presented when the connection on that call is established. If subscriber A originated the call between subscribers A and C, and subscriber C subscribes to CLIP, subscriber Bs identity shall be presented to subscr
