1、 International Telecommunication Union ITU-T Q.761TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 3(01/2006) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 ISDN user partSignalling System No. 7 ISDN User Part functional description Amendment 3: Support for the
2、 International Emergency Preference Scheme ITU-T Recommendation Q.761 (1999) Amendment 3 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVIC
3、ES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 General Q.700 Message
4、 transfer part (MTP) Q.701Q.710 Signalling connection control part (SCCP) Q.711Q.719 Telephone user part (TUP) Q.720Q.729 ISDN supplementary services Q.730Q.739 Data user part Q.740Q.749 Signalling System No. 7 management Q.750Q.759 ISDN user part Q.760Q.769 Transaction capabilities application part
5、 Q.770Q.779 Test specification Q.780Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000
6、Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.761 (1999)/Amd.3 (01/2006) i ITU-T Recommendation Q.761 Signalling System No. 7 IS
7、DN User Part functional description Amendment 3 Support for the International Emergency Preference Scheme Summary This amendment was produced to meet the need for the implementation of the International Emergency Preference Scheme (IEPS) for disaster recovery operations as specified in ITU-T Rec. E.
8、106. It contains the modifications to ITU-T Rec. Q.761 (1999) in order to accommodate these needs. This amendment should be read in conjunction with Amendment 3 to ITU-T Rec. Q.762, Amendment 4 to ITU-T Rec. Q.763, and Amendment 4 to ITU-T Rec. Q.764. This amendment incorporates Amendment 2 to ITU-T
9、 Rec. Q.761 and provides enhancements. Source Amendment 3 to ITU-T Recommendation Q.761 (1999) was approved on 27 January 2006 by ITU-T Study Group 11 (2005-2008) under the WTSA Resolution 1 procedure. ii ITU-T Rec. Q.761 (1999)/Amd.3 (01/2006) FOREWORD The International Telecommunication Union (ITU
10、) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standard
11、izing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is cover
12、ed by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indica
13、te both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved w
14、hen all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPE
15、RTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserte
16、d by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned tha
17、t this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2006 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.761 (1999)/Amd.3 (01/20
18、06) iii CONTENTS Page 1) Clause 1.1 Scope 1 2) Clause 1.2 References 1 3) Clause 1.3 Terms and definitions 1 4) Clause 2.4.1 ISUP Interworking 1 5) Clause 3 Capabilities supported by the ISDN user part 2 6) New Appendix II 2 ITU-T Rec. Q.761 (1999)/Amd.3 (01/2006) 1 ITU-T Recommendation Q.761 Signal
19、ling System No. 7 ISDN User Part functional description Amendment 3 Support for the International Emergency Preference Scheme 1) Clause 1.1 Scope Insert the following paragraph at the end of this clause (below the Note): The International Emergency Preference Scheme is described in ITU-T Rec. E.106,
20、 International Emergency Preference Scheme (IEPS) for Disaster Relief Operations 12. The associated ISUP functional descriptions, formats and codes, and procedures are to be found in ITU-T Recs Q.762 6, Q.763 7, and Q.764 8. 2) Clause 1.2 References Add the following new references: 12 ITU-T Recomme
21、ndation E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. 13 ITU-T Recommendation E.412 (2003), Network management controls. 14 ITU-T Recommendation Q.767 (1991), Application of the ISDN User Part of CCITT signalling system No. 7 for international ISDN in
22、terconnections. 15 ITU-T Recommendation Q.1902.x series (2001), Bearer Independent Call Control protocol (Capability Set 2). 3) Clause 1.3 Terms and definitions Add the following new definitions: 1.3.6 ISUP97: 1997 release of ISUP Recommendations. 1.3.7 ISUP 2000: 1999 release of ISUP Recommendation
23、s. 4) Clause 2.4.1 ISUP Interworking Insert the appropriate reference number 14 after each appearance of ITU-T Rec. Q.767. 2 ITU-T Rec. Q.761 (1999)/Amd.3 (01/2006) 5) Clause 3 Capabilities supported by the ISDN user part Insert the following new entry and Note into Table 1/Q.761: Table 1/Q.761 Func
24、tion/service National use International International Emergency Preference Scheme (Note) NOTE The procedures specified here for the international signalling network can be applied in national networks also. It is essential that the call is set up in the originating and destination national networks
25、with utmost priority. 6) New Appendix II Insert the following new Appendix II: Appendix II ISUP enhancements to support IEPS II.1 Introduction There is an urgent need for enhancements to ISUP implementations in support of the International Emergency Preference Scheme (IEPS) as specified in ITU-T Rec
26、. E.106 12. The intent is to increase the probability of call completion in congested network situations for authorized callers. These enhancements only apply to the international interface. Administrations and network operators are encouraged to support these or similar capabilities in their domest
27、ic networks. II.2 Scope This appendix provides an overview of the signalling needed to support IEPS. The ISUP enhancements to the other ITU-T Recommendations of this series relating to basic call are provided in corresponding amendments to ITU-T Recs Q.762, Q.763, and Q.764. To provide a viable IEPS
28、 capability, it is required to implement all the amendments to the ITU-T Recommendations of this series. II.3 Approach The implementation of IEPS support may take place in a phased approach in a forward compatible manner. This phased approach facilitates and expedites the introduction of IEPS and al
29、lows its support by different ISUP versions. The phases are: a) The minimum implementation relies on the transfer in ISUP of a specific IEPS call marking in the forward direction for preferential call set-up in the international network. In an international exchange, any call attempt with this IEPS
30、call marking shall bypass restrictive call handling procedures (for example network management controls as specified in ITU-T Rec. E.412 13). b) An improved implementation provides the generation of an early ACM. The aim of this mechanism is to reduce call set-up failures due to timer expiration cau
31、sed by, for example, queuing delays for trunk allocation on congested routes. ITU-T Rec. Q.761 (1999)/Amd.3 (01/2006) 3 c) An additional information transfer mechanism, based on a new parameter in conjunction with the IEPS call marking, is used to facilitate enhancements of IEPS in the areas of iden
32、tification and priority levels. II.4 ISUP versions and ISUP-based protocols As the ISUP2000 specifications 6, 7, 8 are published in different ITU-T Recommendations, these amendments to ISUP provide all necessary information for support of IEPS in international exchanges. IEPS can be implemented on t
33、he previous versions ISUP92 and ISUP97 by the identical amendments made for ISUP2000. In support of IEPS, ITU-T Recs Q.767 14 and Q.1902.x series 15 are also being amended. Printed in Switzerland Geneva, 2006 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General
34、 tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated servic
35、es digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, inc
36、luding TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R
37、Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
