1、 ETSI TS 123 091 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service; Stage 2 (3GPP TS 23.091 version 15.0.0 Release 15) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE C
2、OMMUNICATIONSRETSI ETSI TS 123 091 V15.0.0 (2018-07)13GPP TS 23.091 version 15.0.0 Release 15Reference RTS/TSGC-0423091vf00 Keywords GSM,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Assoc
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14、produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross referenc
15、e between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clau
16、se 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 123 091 V15.0.0 (2018-07)33GPP TS 23.091 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3F
17、oreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Explicit Call Transfer (ECT) 6g34.1 Functions 6g34.2 SDL diagrams and information flows 8g34.2.1 General description . 8g34.2.2 ECT (both
18、calls answered) 8g34.2.3 ECT (one call answered, the other alerting) . 11g34.3 Interaction with other supplementary services . 14g34.3.1 Line Identification services . 14g34.3.2 Call Forwarding Unconditional (CFU) . 16g34.3.3 Call Forwarding on mobile subscriber Busy (CFB) . 17g34.3.3.1 Call Forward
19、ing on mobile subscriber Busy due to Network Determined User Busy (NDUB) . 17g34.3.3.2 Call Forwarding on mobile subscriber Busy due to User Determined User Busy (UDUB) . 17g34.3.4 Call Forwarding on No Reply (CFNRy) . 18g34.3.5 Call Forwarding on mobile subscriber Not Reachable (CFNRc) 18g34.3.6 Ca
20、ll Waiting (CW) 18g34.3.7 Call Hold (HOLD) 18g34.3.8 Multi Party (MPTY) . 18g34.3.9 Closed User Group (CUG) . 18g34.3.10 Advice of Charge (AoC) services . 19g34.3.11 Call Barring services . 19g34.3.12 Explicit Call Transfer (ECT) 19g34.4 Information stored in the HLR . 19g34.5 State transition model
21、 . 19g34.6 Transfer of information from the HLR to the VLR 19g34.7 Information stored in the VLR . 19g34.8 Handover 20g3Annex A: Change history . 21g3History 22g3ETSI ETSI TS 123 091 V15.0.0 (2018-07)43GPP TS 23.091 version 15.0.0 Release 15Foreword This Technical Specification has been produced by
22、the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of r
23、elease date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.
24、e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 123 091 V15.0.0 (2018-07)53GPP TS 23.091 version 15.0.0 Release 151 Scope The present document gives the stage 2 description of the
25、call transfer supplementary services. Only one call transfer supplementary service has been defined, this is the Explicit Call Transfer (ECT) supplementary service, and is described in the present document. 2 References The following documents contain provisions which, through reference in this text
26、, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In t
27、he case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “3G Vocabulary“. 2 3GPP TS 23.083: “Call Waiting (CW) and Call Hold (HOLD) supplement
28、ary services - Stage 2“. 3 3GPP TS 24.008: “Mobile Radio Interface Layer 3 specification; Core Network Protocols - Stage 3“. 4 EN 300 368: “Integrated Services Digital network (ISDN); Explicit Call Transfer (ECT) supplementary service; Functional capabilities and information flows“. 5 EN 300 356-14:
29、 “Integrated Services Digital network (ISDN); Signalling System No. 7; ISDN User Part (ISUP) version 3 for the international interface; Part 14: Explicit Call Transfer (ECT) supplementary service “. 6 3GPP TS 23.011: “Technical realization of Supplementary Services“. 7 3GPP TS 23.018: “Basic Call Ha
30、ndling“. 3 Definitions and abbreviations 3.1 Definitions First call: One of the subscriber A calls (answered). Notification Indicator (NI): Indicates to each remote party in which state of the other remote party ECT was performed (active, alerting). Redirection Number (Rdn): Includes the presentatio
31、n indicator and the directory number of the other remote party. Second call: The other subscriber A call (answered or alerting). Subscriber A (PARTY A): The served mobile subscriber - the one who has subscribed to, and invokes the ECT Supplementary Service. Subscriber B (PARTY B): The other party in
32、 the subscriber A first call. Subscriber C (PARTY C): The other party in the subscriber A second call. Subscriber D (PARTY D): The forwarded-to party when the call is forwarded by the subscriber C. Transferred call: The resulting call after successful explicit call transfer between B and C. ETSI ETS
33、I TS 123 091 V15.0.0 (2018-07)63GPP TS 23.091 version 15.0.0 Release 153.2 Abbreviations In addition to those below, abbreviations used in the present document are listed in 3GPP TR 21.905 1. ECT: Explicit Call Transfer supplementary service LI: Line Identity NI: Notification Indicator Rdn: Redirect
34、ion numberRdnB: Redirection number of party B RdnD: Redirection number of party D 4 Explicit Call Transfer (ECT) 4.1 Functions The following function has been identified for the explicit call transfer service: MAF027 Explicit Call Transfer related authorizations examination The ability of a PLMN com
35、ponent to determine the authorizations relating to explicit call transfer. See figure 1. Location: VLR ETSI ETSI TS 123 091 V15.0.0 (2018-07)73GPP TS 23.091 version 15.0.0 Release 15Figure 1: Explicit Call Transfer related authorizations examination (VLR) Process in the VLR to checkif ECT is provisi
36、oned.Process MAF027 391_1(1)Signals to/from the left areto/from the MSC.IdleCheck ECTsubscriptionECTprovisionedSS-CSIprovisioned?ECT markedin CSI?Indicator:=ECT_availableProcessECTIdleIndicator:=ECT_available+ SS-CSIIndicator:=ECT_not_availableYesYesNoYesNoNoETSI ETSI TS 123 091 V15.0.0 (2018-07)83G
37、PP TS 23.091 version 15.0.0 Release 154.2 SDL diagrams and information flows 4.2.1 General description The procedures Handle_ECT_Active and Handle_ECT_Alerting show the behaviour of the service as perceived by the served mobile subscriber and by any of the other parties involved in the transfer. The
38、se procedures and the macro Check_ECT show the actions to be taken by the network and the information provided by the network to the users. The following states for the invocation of the ECT supplementary service are defined: a) First Call (Active, Held), Second Call (Active, Idle); b) First Call (A
39、ctive, Held), Second Call (Call Delivered, Idle). NOTE: The call state “call delivered“ means that an ALERTING message has been sent to the MS, but no ANSWER Message (ANM) has been received. In the information flows it is assumed that the served subscriber is a mobile subscriber and that the other p
40、arties are mobile or fixed subscribers. Party A is the subscriber controlling the Explicit Call Transfer Call (served mobile subscriber). Party B is the first remote party called. Party C is the second remote party called. The served party is disconnected by the generic disconnect/release procedure
41、after a successful transfer request. The connection of the remote parties in a new call (transferred call) is located in the served subscribers MSC. The information flows in figures 4 and 7 show the unsuccessful case (i.e. the check in the VLR or in the MSC fails). The information flows in figures 5
42、 and 8 show the successful case. 4.2.2 ECT (both calls answered) The SDL for the procedure Handle_ECT_Active (Explicit Call Transfer - both calls have been answered) is shown in figure 2. The checks of whether Explicit Call Transfer is barred or not are shown in figure 3. The corresponding informati
43、on flows are given in figure 4 and figure 5. ETSI ETSI TS 123 091 V15.0.0 (2018-07)93GPP TS 23.091 version 15.0.0 Release 15Figure 2: Procedure Handle_ECT_Active Procedure in the originating MSC to handle an Explicit Call Transfer when the first call leg (A-B) is connected and on hold and the otherc
44、all leg (A-C) is connected and active.Procedure Handle_ECT_Active ECT_Ac(1)Signals to/from the left areto/from the MS;signals to/from the right areto/from all/any remote partiesunless stated otherwise.Check_ECTConnect bothcallsECTrejectTo the held partyRetrievenotificationResult:=FailTransfernotific
45、ationECT ackSS-CSIpresent?SS InvocationnotifyTo gsmSCFFor call legsA-B - receives and accepts a call from subscriber C (by putting B on Hold), table 4 applies to the information supplied to subscriber B. ETSI ETSI TS 123 091 V15.0.0 (2018-07)153GPP TS 23.091 version 15.0.0 Release 15Table 1: Mobile
46、subscriber A was calling subscriber B, puts B on hold and calls subscriber C Call states COLR indication received from Information provided to C subscribers Bs network A-B Active Indicated “allowed“ At time of transfer: A-C Active / Alerting NI: “call transferred, active“ Rdn: PI = allowed, LI of B
47、A-B Active Indicated “restricted“ At time of transfer: A-C Active / Alerting NI: “call transferred, active“ Rdn: PI = restricted (note 1) A-B Active No indication received At time of transfer: A-C Active / Alerting (e.g. interworking) NI: “call transferred, active“ Rdn: PI = not available Table 2: M
48、obile subscriber A was called by subscriber B, puts B on hold and calls subscriber C Call states CLIR indication received from Information provided to C subscribers Bs network A-B Active Indicated “allowed“ At time of transfer: A-C Active / Alerting NI: “call transferred, active“ Rdn: PI = allowed,
49、LI of B A-B Active Indicated “restricted“ At time of transfer: A-C Active / Alerting NI: “call transferred, active“ Rdn: PI = restricted (note 1) A-B Active No indication received At time of transfer: A-C Active / Alerting (e.g. interworking) NI: “call transferred, active“ Rdn: PI = not available NOTE 1: If the subscriber C has CLIP Override Category then the following information is carried in the Redirection number: PI = restricted, LI of B. ETSI ETSI TS 123 091 V15.0.0 (2018-07)163GPP TS 23.091 version 15.0.0 Release 15Table 3: Mobile subscriber A puts t
