1、 International Telecommunication Union ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 53(09/2005) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements to support the International Emergency Preference Scheme (IEPS) ITU-T Q-series Recommendations Supplement 53 ITU-T Q-
2、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 SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF
3、 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 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099
4、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 BROADBAND ISDN Q.2000Q.2999 For further details, please
5、 refer to the list of ITU-T Recommendations. Q series Supplement 53 (09/2005) i Supplement 53 to ITU-T Q-series Recommendations Signalling requirements to support the International Emergency Preference Scheme (IEPS) Summary This Supplement is an information document intended to identify the signalli
6、ng requirements required to support the International Emergency Preference Scheme (IEPS). IEPS is described in ITU-T Rec. E.106 and allows authorized users to have access to the International Telephone Service while the service is restricted due to damage, congestion, and/or other faults. IEPS capab
7、ilities provide authorized users with preferential call and connection handling. Source Supplement 53 to ITU-T Q-series Recommendations was agreed on 9 September 2005 by ITU-T Study Group 11 (2005-2008). ii Q series Supplement 53 (09/2005) FOREWORD The International Telecommunication Union (ITU) is
8、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 standardizing
9、 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 covered by
10、 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 publication, the expression “Administration“ is used for conciseness to indicate both
11、a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the publication is achieved when all of these
12、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 publication is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws
13、 attention to the possibility that the practice or implementation of this publication 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 asserted by ITU members or oth
14、ers outside of the publication development process. As of the date of approval of this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementors are cautioned that this may not represent the lat
15、est 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. Q series Supplement 53 (09/2005) iii CONTENTS Page 1 Scope 1 2 Refer
16、ences. 1 3 Definitions 2 4 Abbreviations and Acronyms . 2 5 Introduction 2 6 General requirements 3 7 Detailed requirements. 3 7.1 Identification of IEPS traffic and priority levels 3 7.2 Security. 4 7.3 Interworking . 4 7.4 IEPS treatment 4 8 Conclusion 6 Annex A Support of IEPS bearer level priori
17、ty indicator in E.106 6 A.1 Backward backbone network establishment composite flow. 6 Annex B Use of polling in the CSF for IEPS BICC calls. 15 Q series Supplement 53 (09/2005) 1 Supplement 53 to ITU-T Q-series Recommendations Signalling requirements to support the International Emergency Preference
18、 Scheme (IEPS) 1 Scope This Supplement identifies the signalling requirements to support preferential capabilities within networks that are used to support emergency response/recovery activities and disaster responders. IEPS is described in ITU-T Rec. E.106, International Emergency Preference Scheme
19、 (IEPS) for disaster relief operations. 2 References 1 ITU-T Recommendation E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. 2 ITU-T Recommendation E.370 (2001), Service principles when public circuit-switched international telecommunication networks int
20、erwork with IP-based networks. 3 ITU-T Q-series Recommendations Supplement 47 (2003), Emergency services for IMT-2000 networks Requirements for harmonization and convergence. 4 ITU-T Q-series Recommendations Supplement 32 (2002), Technical Report TRQ.2141.1: Signalling requirements for the support o
21、f narrowband services via broadband transport technologies CS-2 signalling flows. 5 ITU-T Q-series Recommendations Supplement 22 (1999), Technical Report TRQ.3000: Operation of the bearer independent call control (BICC) protocol with digital subscriber signalling system No. 2 (DSS2). 6 ITU-T Q-serie
22、s Recommendations Supplement 23 (1999), Supplement to ITU-T Q.1901 Recommendation Technical Report TRQ.3010: Operation of the bearer independent call control (BICC) protocol with AAL Type 2 Signalling Protocol (CS-1). 7 ITU-T Recommendation Q.1902.x series (2001), Bearer Independent Call Control pro
23、tocol (Capability Set 2). 8 ITU-T Recommendation Q.1950 (2002), Bearer independent call bearer control protocol. 9 ITU-T Recommendation Q.2931 (1995), Digital Subscriber Signalling System No. 2 User-Network Interface (UNI) layer 3 specification for basic call/connection control. 10 ITU-T Recommendat
24、ion Q.2630.3 (2003), AAL type 2 signalling protocol Capability Set 3. 11 ITU-T Recommendation Y.1271 (2004), Framework(s) on network requirements and capabilities to support emergency telecommunications over evolving circuit-switched and packet-switched networks. 12 ITU-T Recommendation M.3350 (2004
25、), TMN service management requirements for information interchange across the TMN X-interface to support provisioning of Emergency Telecommunication Service (ETS). 2 Q series Supplement 53 (09/2005) 3 Definitions This Supplement defines the following term: 3.1 authenticating entity: A recognized ent
26、ity that validates that the user of the IEPS is entitled to such use under the charter of that entity. There would be a number of such entities, each tasked with authenticating attempts for IEPS by their members. 4 Abbreviations and Acronyms This Supplement uses the following abbreviations: AAL 2 AT
27、M Adaptation Layer type 2 ACC Automatic Congestion Control ACG Automatic Code Gap BICC CS-2 Bearer Independent Call Control protocol, Capability Set 2 B-ISDN Broadband ISDN B-ISUP B-ISDN User Part CANF CANcel From CANT CANcel To CBC Call Bearer Control Protocol CPC Calling Partys Category DSS2 Digit
28、al Subscriber Signalling System No. 2 IAM Initial Address Message IEPS International Emergency Preference Scheme ISDN Integrated Services Digital Network ISUP ISDN User Part NMC Network Management Control PLMN Public Land Mobile Network PSTN Public Switched Telephone Network QoS Quality of Service A
29、ll other relevant abbreviations are contained in the above references. 5 Introduction Disaster situations can occur any time, any place, unexpectedly. These events often significantly damage the community infrastructure and severely disrupt daily living. Recovery requires rapid response by local aut
30、horities, immediate reaction from utility service providers, and support from medical, construction, fire, and police resources. Effective communications are essential to facilitate the myriad activities for coordinating lifesaving activities concurrent with re-establishing control in the disaster a
31、rea. Following a disaster, immediate response operations focus on saving lives, protecting property, and meeting basic human needs. Q series Supplement 53 (09/2005) 3 When a disaster strikes, the public telecommunications infrastructure generally sustains damage, experiences excessive traffic loads,
32、 and is subject to external interference that may severely limit the ability for response and recovery activities to communicate. Therefore, special provisions to facilitate effective communications for the emergency activities are necessary. This includes priority establishment and processing of co
33、mmunications through the telecommunication resources that remain available. IEPS traffic needs to receive preferential use of the surviving capacity of the impacted network. 6 General requirements The general requirements for IEPS are currently contained in ITU-T Rec. E.106 for Integrated Services D
34、igital Networks (ISDN), Public Land Mobile Networks (PLMN), and Public Switched Telephone Networks (PSTN), irrespective of the bearer technology. Essential network features are identified as priority dial tone, priority call set up, including priority queuing schemes, and exemption from restrictive
35、network management controls, such as call gapping. The basic services E.106 addresses are voice and data. The growing emergence of integrated voice and data services of next generation telecommunication and mobile networks not only supports telephony but also provides a variety of enhanced modes of
36、communication. These additional services can also be used for emergency communications and will enable emergency recovery operations to have a comprehensive menu of supporting communication capabilities. In addition to the IEPS priority indication, the country/network of call origination and multipl
37、e levels of priority are required to be supported in the call control network based on bilateral agreement between administrations. Similarly, the IEPS priority indication is required to be supported in the bearer control network. 7 Detailed requirements 7.1 Identification of IEPS traffic and priori
38、ty levels Calls need to be marked to identify authorized IEPS users and the identification be maintained through to completion. Support for the IEPS call indicator is required for signalling, switching, and in bearer and traffic channels. An IEPS priority indicator is generated in a network of the c
39、all originating country. The IEPS priority indicator is set independently from any other indicator or condition and is included in the very first signalling message of the call set up procedure, e.g., IAM. The Bearer Control Signalling Protocol shall, where possible, signal the IEPS priority indicat
40、or in the very first signalling message of the bearer setup procedure, e.g., SETUP, INVITE, etc. This will ensure that the Bearer Relay Nodes provide priority to Bearer setup with an IEPS indicator. The IEPS priority indication is retained in call and bearer control throughout the call duration. Net
41、works supporting IEPS use the Calling partys category and IEPS indicator values to trigger IEPS treatment. These values should be set prior to accessing the international network (for example, within the originating national network or at the outgoing international gateway). Thirty-two levels of pri
42、ority have been identified within ISUP and BICC. Priority levels are not used to provide preferential treatment for the call. The lowest numerical value signals the highest priority. Incoming international gateway exchanges may be equipped to map priority level indications received in the context of
43、 incoming international IEPS calls to national priority levels required and applied in the terminating countries. In case that mapping is not implemented, priority level may be discarded, however the call shall continue to be treated as a priority call. 4 Q series Supplement 53 (09/2005) 7.2 Securit
44、y Security protection is necessary to prevent unauthorized users from accessing scarce resources needed to support emergency operations. This includes such threats as spoofing, intrusion, and denial of service. IEPS calls should be protected against possible attempts to obstruct or otherwise impede
45、the provision, operation and performance of the IEPS service. Additional procedures concerning national issues should be considered, but are outside the scope of this Supplement. 7.3 Interworking IEPS may be accessed or terminated via legacy national preference schemes or emergency services. Interna
46、tional networks supporting IEPS should, at a minimum, transparently carry additional national information. Gateways between domains using different preference mechanisms must be able to translate IEPS markings (i.e., IEPS CPC value) appropriately. The following relationship exists between a national
47、 legacy and the IEPS priority scheme: i) Priority or preference within the international systems does not necessarily guarantee priority in national telecommunications networks. ii) Priority or preference within national systems does not necessarily guarantee priority in the international telecommun
48、ications networks. iii) IP-to-PSTN gateways should use the IEPS CPC value to maintain the identification for priority/preference for calls established as IEPS as consistent with clauses i and ii. iv) PSTN-to-IP gateways should have the capability to recognize the IEPS CPC value of an IEPS call, cons
49、istent with clauses i and ii, and mark packets in some way that maintains the identification for priority/preference treatment. IEPS may be accessed or terminated via national preference schemes or emergency services. With regard to the priority rights, the following relationship between a national and the international emergency system (IEPS) is ensured: Priority in national systems does not include priority in IEPS. This is to avoid IEPS access by non-entitled users. IEPS priority always i
