1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.734.2 SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN sup p I e m e n ta ry servi ces (07196) Stage 3 description for multiparty supplementary services using Signalling S
2、ystem No. 7: Three-party service ITU-T Recommendation (2.734.2 (Previously CCIlT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN T
3、HE ISDN SPECIFICATION OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 CLAUSES APPLICABLE TO ITU
4、-T STANDARD SYSTEMS General Message transfer part Signalling connection control part Q.1-Q.3 Q.4-Q.59 Q. 1 00-Q. 1 I9 Q.60-Q.99 Q. 120-Q.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849 Q.700 Q.701-Q.709 Q.711-Q.719 II Telephone user part Q. 720-Q. 729 Data user part Q.740
5、-Q.749 Signalling System No. 7 management ISDN user part Transaction capabilities application part Test specification Q3 interface DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. I PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN Q.750-Q.759 Q. 760-Q.
6、769 Q.770-Q.779 Q. 780-Q. 799 Q. 800-Q.849 Q.850-Q.999 Q. 1000-Q. 1 O99 Q. 1 1 OO-Q. 1 I 99 Q. 1200-Q. I999 Q.2000-Q.2999 For further details, please refer to ITU-T List of Recommendations. STDaITU-T RECMN Q.734.2-ENGL 171b 48b251L Ob3LZb7 4T2 W ITU-T RECOMMENDATION 4.734.2 STAGE 3 DESCRIPTION FOR M
7、ULTIPARTY SUPPLEMENTARY SERVICES USING SIGNALLING SYSTEM NO. 7: THREE-PARTY SERVICE Summary This Recommendation defines the essential functions, procedures and messages required for the transportation of information relating to the three-party supplementary service. This Recommendation has been upda
8、ted due to a need for alignment with the revised specification of this supplementary service within DSS 1. Source ITU-T Recommendation Q.734.2 was prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 9th of July 1996. STD-ITU-T RECMN Q.734-2-
9、ENGL 1711 131 48b259L Ob31270 11i FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The IT Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical,
10、 operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in
11、their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collabo
12、rative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or impl
13、ementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development pr
14、ocess. As of the date of approval of this Recommendation, the ITU hadhad not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefor
15、e strongly urged to consult the TSB patent database. O ITU 1997 I All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. II Recommendation
16、4.734.2 (07/96) CONTENTS Page 2 2.1 2.2 2.3 2.4 2.5 2.6 Three-Party Service Introduction 2.1.1 Scope . 2.1.2 References . 2.1.3 Terms and definitions 2.1.4 Abbreviations Description . 2.2.1 General description 2.2.2 Specific terminology . 2.2.3 Qualification on the applicability to telecommunication
17、 services 2.2.4 State definitions . Operational requirements 2.3.1 Provisiodwithdrawal 2.3.2 Requirements on the originating network side 2.3.3 2.3.4 Requirements at the destination network side . Coding requirements Requirements in the network . Signalling requirements 2.5.1 Activatioddeactivatiodr
18、egistration 2.5.2 Invocation and operation . Interactions with other supplementary services 2.6.1 2.6.2 2.6.3 2.6.4 2.6.5 2.6.6 2.6.7 2.6.8 2.6.9 2.6.10 2.6.1 1 2.6.12 2.6.13 2.6.14 2.6. i 5 2.6.16 Call Waiting (Cy Explicit Call Transfer (ECT) . Connected line identification restriction (COLR) . Cal
19、ling Line Identification Presentation (CLIP) . Calling Line Identification Restriction (CLIR) . Closed User Group (CUG) Conference calling (CONF) Direct-Dialling-In (DDI) . Diversion services . Line Hunting (LH) Three-Party Service (3PTY) User-to-User Signalling (UUS) . Multiple Subscriber Number (M
20、SN) . Call hold (HOLD) . Advice of Charge (AOC) Connected line identification presentation (COLP) Recommendation 4.734.2 (07196) 3 3 3 3 3 3 3 4 4 4 7 7 8 8 8 8 8 8 8 8 8 8 8 9 9 9 9 . Ill STD-ITU-T RECMN Q.734.2-ENGL 1996 YBbZ591 Ob31272 T97 = 2.6.1 7 Sub-addressing (SUB) . 2.6.18 Terminal Portabil
21、ity (TP) Malicious Call Identification (MCID) . 2.6.19 Completion of Calls to Busy Subscriber (CCBS) . 2.6.20 2.6.21 Reverse charging (REV) . 2.6.22 Multi-Level Precedence and Preemption (MLPP) 2.6.23 Support of Private Numbering Plan (SPNP) . 2.6.24 International telecommunication charge card . 2.7
22、 Interactions with other networks 2.8 Signalling flows 2.9 Parameter values (timers) . 2.1 O Dynamic descnption . Page 9 9 9 9 9 9 9 9 10 10 14 14 iv Recommendation 4.734.2 (07/96) Recommendation Q.734.2 STAGE 3 DESCRIPTION FOR MULTIPARTY SUPPLEMENTARY SERVICES (Geneva, 1996) USING SIGNALLING SYSTEM
23、 NO. 7: THREE-PARTY SERVICE 2 Three-Party Service 2.1 Introduction 2.1.1 Scope This Recommendation describes the stage 3 of the three-party supplementary service for the Integrated Services Digital Network (ISDN) by means of the Signalling System No. 7 ISDN User The three-party (3PTY) supplementary
24、service enables a user to establish a three-way conversation, i.e. a simultaneous communication between the served user and two other users. The 3PTY supplementary service is applicable to all circuit-switched telecommunication services carrying speech. Part (ISUP). 2.1.2 References The following IT
25、U-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommen
26、dation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation Q.730 (1 993), ISDN supplementary services. IT
27、U-T Recommendation 4.761 (1993), Functional description of the ISDN user part of Signalling System No. 7. ITU-T Recommendation 4.762 (1993), General function of messages and signals of the ISDN user part of Signalling System No. 7. ITU-T Recommendation Q.763 (1993), Formats and codes of the ISDN use
28、r part of Signalling System No. 7. ITU-T Recommendation 4.764 (1 993), ISDN user part signalling procedures. CCITT Recommendation 1.254.2 (1 992), Three-Party supplementary service. ITU-T Recommendation Q.84.2 (1 995), Stage 2 description for multiparty supplementary services: Three-Party service. I
29、TU-T Recommendation Q.954.2 (1 995), Stage 3 description for multiparty supplementary services using DSS I: Three-Party service. ITU-T Recommendation I. 1 12 (1 993), Vocabulary of terms for ISDNs. ITU-T Recommendation 1.2 1 O (1 993), Principles of telecommunication services supported by an ISDN an
30、d the means to describe them. Recommendation 4.734.2 (07/96) I 2.1.3 Terms and definitions This Recommendation defines the following terms. 2.1.3.1 served user (user A): The user who has the service under his control during the invocation and the active phase. 2.1.3.2 remote users (user B and user C
31、): The users involved in the two calls that are joined together into a three-way conversation. 2.1.3.3 integrated services digital network (ISDN): See 2.3A.112 9, definition 308. 2.1.3.4 private communication: Communication between the served user and one remote user. This excludes communication wit
32、h the other remote user. 2.1.3.5 service; telecommunications service: See 2.2I.112 9, definition 201. 2.1.3.6 supplementary service: See 2.4A.210 i O. 2.1.3.7 three-way conversation: Communication between all three users, i.e. the served user and both remote users. 2.1.4 Abbreviations This Recommend
33、ation uses the following abbreviations. 3PTY Three-Party Service CPG Call Progress Message DSS 1 ISDN Integrated Services Digital Network ISUP ISDN Signalling User Part SS No. 7 Signalling System No. 7 Digital Subscriber Signalling System No. 1 2.2 Description 2.2.1 General description The served us
34、er, which has two calls can join the two calls, to form a three-way conversation. NOTE - Each call, to be involved in the 3PTY supplementary service, can have been originated by either the served user, or by the appropriate remote user. During the three-way conversation, the served user can request
35、that the network: - - terminates the three-way conversation; - - explicitly disconnects one of the remote users, and the connection to that remote user; creates a private communication with one of the remote users; or in conjunction with the call hold supplementary service, place its connection to t
36、he three- way conversation on hold. Either of the remote users (user B or user C) can request that the network disconnects the connection. Remote users are notified of these actions. The stage 1 ITU-T definitions for the 3PTY supplementary service is given in Recommendation 1.254.2 6. The stage 2 IT
37、U-T description is given in Recommendation 4.84.2 7. The stage 3 DSS 1 ITU-T description is given in Recommendation 4.954.2 8. This stage 3 description of the 3PTY supplementary service uses the ISDN User Part protocol as defined in Recommendations 4.761 2, 4.762 3, 4.763 4, 4.764 SI and 4.730 l. 2
38、Recommendation 4.734.2 (07196) 2.2.2 Specific terminology See 2.1.3. 1000011 1111001 2.2.3 See 2.1.1. Qualification on the applicability to telecommunication services Conference disconnected Remote hold 2.2.4 State definitions No specific states are required. 2.3 Operational requirements 2.3.1 Provi
39、siodwithdrawal See Recommendation 1.254.2 6. 2.3.2 This subclause is not applicable to SS No. 7. Requirements on the originating network side 2.3.3 Requirements in the network No specific requirements are needed in the network. 2.3.4 This subclause is not applicable to SS No. 7. Requirements at the
40、destination network side 2.4 Coding requirements For the 3PTY supplementary service, the call progress message, containing the generic notification indicator parameter, shall be used to send the appropriate notification towards the remote user. The generic notification indicator is accompanied by th
41、e parameter compatibility information parameter. The procedures for compatibility are defined in 2.934.764 5. The event indicator is set to “Progress”. The following notification descriptions are used: - conference established; - conference disconnected; - remote hold. The generic notification indic
42、ator parameter field shall be coded as shown below See Table 2-1. Table 2-UQ.734.2 - Coding of the generic notification indicator parameter Bits Description 7654321 c 1000010 Conference established Recommendation 4.734.2 (07/96) 3 STD-ITU-T RECMN Q.73q-Z-ENGL L79b 48b257L Ob3L27b b32 M 2.5 Signallin
43、g requirements 2.5.1 Activation/deactivation/registration This subclause is not applicable to SS No. 7. 2.5.2 Invocation and operation 2.5.2.1 The originating local exchange is the exchange where the service is controlled. The originating local exchange for this description is not necessarily the or
44、iginating exchange for the basic call. Actions at the originating local exchange 2.5.2.1.1 Normal operation 2.5.2.1.1.1 Requirements related to echo control a) General When the conference bridge is located in the originating local exchange, this exchange shall have the capability to invoke echo-cont
45、rol procedures. This is necessary in the case the total propagation delay for the two legs of the three-way conversation is above the value for which echo control is necessary. (Reference: 2.6Q.764 5.) The exchange shall also have the capability of storing propagation delay information received eith
46、er in a received Initial Address message (for incoming calls) or in an Answer/Connect message (for outgoing calls) until call release. This shall be done for both legs included in the three-way conversation. Criteria to initiate echo control procedures The originating local exchange has to sum up th
47、e propagation delay values of the calls A-B and A-C in order to determine the total value of propagation delay of the three-way conversation. If echo control is necessary, the exchange shall initiate echo control procedures for each of the legs concerned. (Reference: 2.7/Q.764 5.) b) 2.5.2.1.1.2 Beg
48、inning the three-way conversation Prior to the invocation of the 3PTY supplementary service, the served user (user A) shall be involved in two calls, both in the answered state: one call (e.g. with user B) in a held state and the other one (e.g. with user C) in an active state. When the 3PTY supplem
49、entary service is invoked the originating exchange, to which the served users equipment is connected, shall: a) b) join the two calls together into a three-way conversation; on request of the access protocol (see 2.9.2.1.UQ.954) send a call progress message to each remote user, containing the generic notification indicator parameter with the notification “conference established“. NOTE 1 - See Figure 2-1 and also Figure 2-I.UQ.954. NOTE 2 - For an interim period of time, some networks may not support the sending of notifications to the remote u
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