1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.2761TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(12/2002) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN B-ISDN application protocols for the network signalling Functional description of the B-ISDN user part (B-ISUP) of signalling syst
2、em No. 7 Amendment 1: Support for the International Emergency Preference Scheme ITU-T Recommendation Q.2761 (1999) Amendment 1ITU-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 FUNCT
3、IONS AND INFORMATION FLOWS FOR SERVICES 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 SIGNAL
4、LING SYSTEM R1 Q.310Q.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOB
5、ILE 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 BROADBAND ISDN Q.2000Q.2999 General aspects Q.2000Q.2099 Signalling ATM adaptation lay
6、er (SAAL) Q.2100Q.2199 Signalling network protocols Q.2200Q.2299 Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking Q.2600Q.2699 B-ISDN application protocols for the network signalling Q.2700Q.2899 B-ISDN application protocols for access sign
7、alling Q.2900Q.2999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. Q.2761 (1999)/Amd.1 (12/2002) i ITU-T Recommendation Q.2761 Functional description of the B-ISDN user part (B-ISUP) of signalling system No. 7 Amendment 1 Support for the International Emergency Pr
8、eference Scheme Summary 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.2761 (12/99) in order to accommodate these needs. Thi
9、s amendment should be read in connection with the related amendments to ITU-T Recs Q.2762, Q.2763, and Q.2764. Source Amendment 1 to ITU-T Recommendation Q.2761 (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 Re
10、c. Q.2761 (1999)/Amd.1 (12/2002) 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, op
11、erating and tariff questions 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,
12、 produce Recommendations on these 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 I
13、n this Recommendation, the expression “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 inv
14、olve the use of a claimed Intellectual 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 Rec
15、ommendation, ITU had 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 therefore strongly urged to consult the TSB patent database.
16、 ITU 2003 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.2761 (1999)/Amd.1 (12/2002) iii CONTENTS Page 1) Clause 1 Scope. 1 2) Clause 2 References. 1 3) Clause 4 Abbreviations 1 4) Clause 6 Capabi
17、lities supported by the B-ISDN User Part . 1 5) New Appendix III. 2 ITU-T Rec. Q.2761 (1999)/Amd.1 (12/2002) 1 ITU-T Recommendation Q.2761 Functional description of the B-ISDN user part (B-ISUP) of signalling system No. 7 Amendment 1 Support for the International Emergency Preference Scheme 1) Claus
18、e 1 Scope Insert the following paragraph after the third paragraph: The International Emergency Preference Scheme is described in ITU-T Rec. E.106, Description of an International Emergency Preference Scheme. The associated B-ISUP general functions of messages and signals, formats and codes, and pro
19、cedures are to be found in ITU-T Recs Q.2762 3, Q.2763 4, and Q.2764 5. NOTE If B-ISUP is used as a bearer control protocol in a BICC environment as described in TRQ.3020 (ITU-T Q-series Recommendations, Supplement 16), these amendments to B-ISUP do not apply. 2) Clause 2 References Add the followin
20、g new references numerically: 52 ITU-T Recommendation E.106 (2000), Description of an international emergency preference scheme (IEPS). 53 ITU-T Recommendation E.412 (2003), Network management controls. 54 ITU-T Recommendation Q.767 (1991), Application of the ISDN User Part of CCITT signalling syste
21、m No. 7 for international ISDN interconnections. 55 ITU-T Recommendation Q.1902.x series (2001), Bearer Independent Call Control protocol (Capability Set 2). 3) Clause 4 Abbreviations Insert the following new abbreviation alphabetically: IEPS International Emergency Preference Scheme 4) Clause 6 Cap
22、abilities supported by the B-ISDN User Part Insert the following new entry into Table 1/Q.2761: Table 1/Q.2761 Signalling capabilities for basic call Function/service Origination/Destination nodes Transit nodes International Emergency Preference Scheme Note NOTE The procedures specified here for the
23、 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 with utmost priority. 2 ITU-T Rec. Q.2761 (1999)/Amd.1 (12/2002) 5) New Appendix III Insert the following new Appendix III: Appendi
24、x III B-ISUP enhancements to support IEPS III.1 Introduction There is an urgent need for enhancements to B-ISUP implementations in support of the International Emergency Preference Scheme (IEPS) as specified in ITU-T Rec. E.106 52. The intent is to increase the probability of call completion in cong
25、ested 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 domestic networks. III.2 Scope This appendix provides an overview of the signalling n
26、eeded to support IEPS. The B-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.2762, Q.2763, and Q.2764. To provide a viable IEPS capability, it is required to implement all the amendments to the ITU-T
27、Recommendations of this series. III.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 allows its support by different B-ISUP versions. The phases are: a) The mi
28、nimum implementation relies on the transfer in B-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 call marking shall bypass restrictive call handling procedures (for
29、example network management controls as specified in ITU-T Rec. E.412 53). 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 caused by, for example, queuing delays for trunk allocation on congeste
30、d routes. c) An additional information 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 pa
31、rameter and its associated procedures are not covered in this set of amendments and are for further study. III.4 ISUP versions and ISUP-based protocols As the B-ISUP specifications 3, 4, 5 are published in different ITU-T Recommendations, these amendments to B-ISUP provide all necessary information
32、for support of IEPS in international exchanges. IEPS can be implemented on the other ISUP versions, i.e., ISUP92, ISUP97 and ISUP2000, by the identical amendments made for B-ISUP. In support of IEPS, ITU-T Rec. Q.767 54 and BICC 55 are also being amended. Printed in Switzerland Geneva, 2003 SERIES O
33、F ITU-T RECOMMENDATIONS Series A Organization of the work 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 fa
34、ctors 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 services digital network Series J Cable networks and transmission of television, sound programme and other mul
35、timedia signals Series K Protection against interference Series 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 M
36、aintenance: 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 Telegraph transmission Series S Telegraph ser
37、vices 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
