1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.952.7 SERIES Q: SWITCHING AND SIGNALLING Digital subscriber Signalling System No. I - Stage 3 description for Supplementary services using DSS I (06197) Stage 3 description for call offering supplementary s
2、ervices using DSS I : Explicit Call Transfer (ECT) ITU-T Recommendation Q.952.7 (Previously CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE NTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING UNCTIONS AND INFORMATION FLOWS FO
3、R SERVICES IN THE ISDN ;PECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 IIGITAL EXCHANGES NTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 :LAUSES AP
4、PLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer part (MTP) Signalling connection control part (SCCP) Telephone user part (TUP) ISDN supplementary services Data user part Signalling System No. 7 management ISDN user part Transaction capabilities application part Test specification Q3 inte
5、rface General Data link layer Network layer Ucer-network management DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.1-Q.3 Q.4-Q.59 Q.60-Q.99 Q.100-Q.119 Q.120-Q.249 Q.250-Q. 309 Q.310-Q.399 Q.40O-Q.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849 Q.700 Q.701-Q.709 Q.711-Q.719 Q.720-Q.729 Q.730-Q.739 Q.740-Q. 74
6、9 Q.750-Q.759 Q.760-Q.769 Q.770-Q.779 Q.78O-Q.799 Q. 800-Q. 849 Q. 850-Q. 999 Q.850-Q.919 Q.920-Q.929 Q.930-Q.939 Q .940-Q. 949 - Stage 3 description for supplementary services using DSS 1 Q.950-Q.999 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND
7、 ISDN Q. 1000-Q. 1 O99 Q. 1 1 OO-Q. 1 I99 Q.1200-Q.1999 Q.2000-Q.2999 For further details, please refer to ITU-T List of Recommendations. STD.ITU-T RECMN Q.952.7-ENGL 1997 48b25L Ob39b25 O22 m ITU-T RECOMMENDATION Q.952.7 STAGE 3 DESCRIPTION FOR CALL OFFERING SUPPLEMENTARY SERVICES USING DSS 1: EXPL
8、ICIT CALL TRANSFER (ECT) Summary This Recommendation specifies the DSS 1 signalling requirement on the N-ISDN user-network interface for the Explicit Call Transfer (ECT) supplementary service. The ECT supplementary service enables an ISDN user who has two calls, into one call. Source ITU-T Recommend
9、ation Q.952.7 was prepared by ITU-T Study Group 11 (1997-200) and was approved under the WTSC Resolution No. 1 procedure on the 5th of June 1997. STD-ITU-T RECMN d.952.7-ENGL L777 48b2571 Ob39b2b Tb9 m FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in t
10、he field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide
11、 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 their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the
12、 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 collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate bo
13、th a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The IT draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concernin
14、g the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU hadhad not received notice of intellectual property, protected by
15、 patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1997 All rights reserved. No part of this publication may be reproduced
16、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 4.952.7 (06/97) CONTENTS Page 7 Explicit call transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7.1 Scope 1 1 7.2 References . . . . . . . . . . . . 7.3 Definitions 2 7.4 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7.5 Description . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . .
19、 . . . . . . . . . . . . . . . . . . . . . . . . 4 7.6 Operational requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Provision and withdrawal . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6.2 Requirements on the originating network side 4 Requirements on the destination network side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 4 4 7.6.1 7.6.3 4 7.7 Coding requirements . . . . . . Coding of the Facility information element components . . . . . . , . 5 5 6 6 7.7.1 7.7.2 7.7.3 Coding of the Notification indicator information element . . . . . . Coding of the Redirection number information element . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . 7.8 State definitions . . . . . . . . 7.9 Signalling procedures at the coincident S and T reference point . 7.9.1 Activation, deactivation and registration . . . . . . . . 7.9.2 7.9.3 Invocation and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . Content of notification information . 7.10 Procedures for interworking with private ISDNs . 7.1 O. 1 Call transfer performed in the private network, served user is connected to the private ISDN 7.10.2 Call tr
24、ansfer performed in the public network, remote user is connected to the private ISDN 7.10.3 Procedures for the mechanism to avoid looping of uncontrolled circuits . 7.10.4 Call transfer performed by the public ISDN, served user is connected to the private ISDN . 7.1 1 Interactions with other network
25、s 7.12 Interaction with other supplementary services . 7.12.1 Call Waiting 7.12.2 Call Transfer 7.12.3 Connected Line Identification Presentation . . . , , . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . , . . . . . . . 7.12.4 Connected Line Identification Restriction ., . . . . .
26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.12.5 Calling Line Identification Presentation . . .,. . 7.12.6 Calling Line Identification Restriction . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.12.7 Closed
27、 User Group 7.12.8 Conference Calling . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 7 7 12 16 17 18 19 20 20 21 21 21 21 21 21 21 21 22 . Recommendation Q.952.7 (06197) 111 STD-ITU-T RECMN Q-752.7-ENGL 1777 W 4Bb2541 Ub37b
28、28 831 7.12.9 Direct-Dialling-In 7.12.1 O Call Diversion services . 7.12.12 Three-Party Service . 7.12.13 User-to-User Signalling . 7.12.14 Multiple Subscriber Number . 7.12.15 Call Hold . 7.12.16 Advice ofcharge 7,12.17 Sub-addressing 7.12.1 8 Terminal Portability 7.12.19 Completion of Calls to Bus
29、y Subscribers . 7.12.20 Malicious Call Identification . 7.12.21 Reverse Charging 7.12.22 Multi-level Precedence and Preemption 7.12.23 Support of Private Numbering Plans . 7.12.1 1 Line Hunting . 7.13 Parameter values (timers) . 7.14 Dynamic description (SDL diagrams) 7.14.1 User side SDL . 7.14.2 N
30、etwork side SDL . Appendix I . Signalling flows . Page 23 23 23 23 24 24 24 25 26 26 26 27 27 28 28 28 28 29 34 38 iv Recommendation 4.952.7 (06/97) STD-ITU-T RECMN Q-752.7-ENGL 1777 I 48b2572 Ob37b27 778 W Recommendation Q.952.7 STAGE 3 DESCRIPTION FOR CALL OFFERING SUPPLEMENTARY SERVICES USING DSS
31、 1: EXPLICIT CALL TRANSFER (ECT) (Geneva, 1997) 7 Explicit call transfer 7.1 Scope This Recommendation specifies the stage 3 of the Explicit Call Transfer (ECT) supplementary service for the Integrated Services Digital Network (ISDN) at the T reference point or coincident S and T reference point (as
32、 defined in Recommendation 1.41 1 3) by means of the Digital subscriber Signalling System No. 1 (DSS 1) protocol. Stage 3 identifies the protocol procedures and switching functions needed to support a telecommunications service (see Recommendation I. 130 13). In addition, this Recommendation specifi
33、es the protocol requirements at the T reference point where the service is provided to the user via an intermediate private ISDN. This Recommendation does not speci the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. Th
34、e ECT supplementary service enables a user who has two calls, each of which can be an incoming call or an outgoing call, to connect together the other users in the two calls, into one call. One of the two calls shall be answered, the other call can be either answered or, as a network option, in the
35、alerting phase. The ECT supplementary service is applicable to all circuit-switched basic telecommunication services using one B-channel. Further parts of this Recommendation shall specie the method of testing required to identi conformance to this Recommendation. This Recommendation is applicable t
36、o equipment, supporting ECT supplementary service, to be attached at either side of a T reference point or coincident S and T reference point when used as an access to the public ISDN. 7.2 References The following ITU-T Recornmendation and other references contain provisions which, through reference
37、 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 Recommendation are therefore encouraged to investigate the possibility of applying the most
38、recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. 13 CCITT Recommendation I. 130 (1 988), Method for the characterization of telecommunication services supported by an ISDN and network capabilities of
39、an ISDN. 2 ITU-T Recornmendation 1.252.7 (1 997), Call offering supplementary services: Explicit Call Transfer. Recommendation 4.952.7 (06/97) 1 CCITT Recornmendation 1.41 1 (1988), ISDN user-network interfaces - Reference configurations. ITU-T Recommendation I. 1 12 (1 993), Vocabulary of terms for
40、 ISDNs. ITU-T Recommendation 1.2 1 O (1993), Principles of telecommunication services supported by an ISDN and the means to describe them. ITU-T Recommendation 4.932 (1993), Generic procedures for the control of ISDN supplementary services. CCITT Recommendation E. 164 (1 991), Numberingplan for the
41、ISDN era. ITU-T Recommendation 4.953 (1 993), Stage 3 description for call completion supplementary services using DSS 1. CCITT Recommendation X.208 (1 988), Specification of Abstract Syntax Notation One (ASN. I). CCITT Recommendation X.219 (1 98S), Remote Operations: Model, notation and service Def
42、inition. ITU-T Recommendation 4.93 1 (1 993), ISDN user-network interface layer 3 specifications for basic call control. ITU-T Recommendation Q.952 (1 993), Stage 3 service description for call offering supplementary services using DSS 1 - Diversion supplementary services. ITU-T Recommendation 4.95
43、1 (1 993), Stage 3 description for number identification supplementary services using DSS 1. CCITT Recommendation 2.100 (1988), SpeciJication and Description Language (SDL). ITU-T Recommendation 4.920 (1993), ISDN user-network interface data link layer - General aspects. ITU-T Recommendation 4.956 (
44、1 993), Stage 3 description for charging supplementary services using DSS I. ITU-T Recommendation 4.957 (1 993), Stage 3 description for additional information transfer supplementary services using DSS I. Definitions This Recommendation defines the following terms. 7.3.1 call AX: The call between us
45、er A and user C. 7.3.2 call A-B: The call between user A and user B. 7.3.3 call state: A state as defined in 2.VQ.931 i i, for either the user side or the network side as appropriate. A call state may exist for each call reference value and for each additional responding Connection Endpoint Identifi
46、er (CEI) in the incoming call state. 7.3.4 component: See Appendix IV/Q.932 6. 7.3.5 connection endpoint identifier: The identifier that identifies the data link connection which is used to transfer the signalling information (for the complete definition see 3.4. UQ.920 151). 7.3.6 integrated servic
47、es digital network (ISDN): See 2.2D.112 4, definition 308. 2 Recommendation Q.952.7 (06197) 7.3.7 invoke component: See Appendix IVQ.932 6. Where reference is made to an “XXXX“ invoke component, an invoke component is meant with its operation value set to the value of the operation “xxxx“ . 7.3.8 IS
48、DN number: A number conforming to the numbering and structure specified in Recommendation E. 164 7. 7.3.9 network: DSS 1 protocol entity at the network side of the user-network interface. 7.3.10 network A: The network to which the served user is attached. 7.3.11 network B: The network to which the u
49、ser B is attached, 7.3.12 network C: The network to which the user C is attached. 7.3.13 public network: The DSS 1 protocol entity at the network side of the user-network interface at the T reference point. 7.3.14 private network The DSS 1 protocol entity at the user side of the user-network interface at the T reference point. 7.3.15 reject component: See Appendix IV/Q.932 6. 7.3.16 return error component: See Appendix IV/Q.932 6. Where reference is made to an “xxxx“ return error component, a return error invoke component is meant with its
