1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.761TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(12/2002) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 ISDN user partSignalling System No. 7 ISDN User Part functional description Amendment 2: Support for the
2、 International Emergency Preference Scheme ITU-T Recommendation Q.761 (1999) Amendment 2 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 SYSTEM No. 4 Q.120Q.139 SPECIFICATIONS OF SIGNALLING SYSTEM No. 5 Q.140Q.199 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309 SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310Q.399 SPECIFICATI
4、ONS OF SIGNALLING SYSTEM R2 Q.400Q.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 transfer part (MTP) Q.701Q.709 Signalling connection control part (SCCP) Q.711Q.719 Telephone user part (TUP) Q
5、.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 Q.770Q.779 Test specification Q.780Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.8
6、50Q.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 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBA
7、ND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.761 (1999)/Amd.2 (12/2002) i ITU-T Recommendation Q.761 Signalling System No. 7 ISDN User Part functional description Amendment 2 Support for the International Emergency Preference Scheme Summar
8、y This amendment was produced to meet the urgent need for the implementation of the International Emergency Preference Scheme (IEPS) as specified in ITU-T Rec. E.106. This amendment contains the modifications to ITU-T Rec. Q.761 (1999) in order to accommodate these needs. This amendment should be re
9、ad in connection with the related amendments to IUT-T Recs Q.762, Q.763, and Q.764. Source Amendment 2 to ITU-T Recommendation Q.761 (1999) was prepared by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 December 2002. ii ITU-T Rec. Q.761 (1999)/Amd.2 (12/20
10、02) FOREWORD The International Telecommunication Union (ITU) 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
11、and issuing Recommendations on them with a view to standardizing 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 t
12、hese topics. The approval of ITU-T Recommendations is covered 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 ex
13、pression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Int
14、ellectual Property Right. 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 process. As of the date of approval of this Recommendation, ITU had not rece
15、ived 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 therefore strongly urged to consult the TSB patent database. ITU 2003 All rights reserved
16、. 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.2 (12/2002) 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
17、5) Clause 3 Capabilities supported by the ISDN user part 2 6) New Appendix II 2 ITU-T Rec. Q.761 (1999)/Amd.2 (12/2002) 1 ITU-T Recommendation Q.761 Signalling System No. 7 ISDN User Part functional description Amendment 2 Support for the International Emergency Preference Scheme 1) Clause 1.1 Scope
18、 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 Description of an International Emergency Preference Scheme 12. The associated ISUP functional descriptions, formats and codes, and procedures ar
19、e 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 references: 12 ITU-T Recommendation E.106 (2000), Description of an International Emergency Preference Scheme (IEPS). 13 ITU-T Recommendation E.412 (2003), Network management controls. 14 ITU-T Reco
20、mmendation Q.767 (1991), Application of the ISDN User Part of CCITT signalling system No. 7 for international ISDN interconnections. 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
21、subclauses: 1.3.6 ISUP97 1997 release of ISUP Recommendations. 1.3.7 ISUP 2000 1999 release of ISUP Recommendations. 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.2 (12/2002) 5) Clause 3 Capabilit
22、ies supported by the ISDN user part Insert the following new entry and Note into Table 1/Q.761: Table 1/Q.761 Signalling capabilities for basic call Function/service National use International International Emergency Preference Scheme (Note) NOTE The procedures specified here for the international s
23、ignalling network can be applied in national networks also. It is essential that the call is set up in the originating and destination national networks with utmost priority. 6) New Appendix II Insert the following new Appendix II: Appendix II ISUP enhancements to support IEPS II.1 Introduction Ther
24、e is an urgent need for enhancements to ISUP implementations in support of the International Emergency Preference Scheme (IEPS) as specified in ITU-T Rec. E.106 12. The intent is to increase the probability of call completion in congested network situations for authorized callers. These enhancements
25、 only apply to the international interface. Administrations and network operators are encouraged to support these or similar capabilities in their domestic networks. II.2 Scope This appendix provides an overview of the signalling needed to support IEPS. The ISUP enhancements to the other ITU-T Recom
26、mendations 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 capability, it is required to implement all the amendments to the ITU-T Recommendations of this series. II.3 Approach The implementation of IEPS s
27、upport may take place in a phased approach in a forward compatible manner. This phased approach facilitates and expedites the introduction of IEPS and allows its support by different ISUP versions. The phases are: a) The minimum implementation relies on the transfer in ISUP of a specific IEPS call m
28、arking in the forward direction for preferential call set-up in the international network. In an international exchange, any call attempt with this IEPS call marking shall bypass restrictive call handling procedures (for example network management controls as specified in ITU-T Rec. E.412 13). b) An
29、 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 caused by, for example, queuing delays for trunk allocation on congested routes. ITU-T Rec. Q.761 (1999)/Amd.2 (12/2002) 3 c) An additional informatio
30、n transfer mechanism, based on a new parameter in conjunction with the IEPS call marking, may be introduced to facilitate future enhancements of IEPS for example, in the areas of identification, security, validation, and priority levels. The coding of this new parameter and its associated procedures
31、 is not covered in this set of amendments and is for further study. 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 exc
32、hanges. IEPS can be implemented on the previous versions ISUP92 and ISUP97 by the identical amendments made for ISUP2000. In support of IEPS, ITU-T Recs Q.767 14 and BICC 15 are also being amended. Printed in Switzerland Geneva, 2003 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work
33、of ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Se
34、ries G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference S
35、eries L Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television t
36、ransmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R 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 and open system communications Series Y Global information infrastructure and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems
