1、 TSB-146-A March 2007R/11-2012Telecommunications IP Telephony Infrastructures IP Telephony Support for Emergency Calling Service NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, fac
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22、HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TSB-146-A i Table of Contents 1 Introduction . 1 2 Scope . 1 3 References 3 4 Definitions, Abbreviations and Acronyms 4 4.1 Definitions 4 4.2 Abbreviations and Acronyms. 4 5 Regulatory Consideration. 6 6 Voice over IP
23、 Networks. 6 7 Requirements Summary . 6 7.1 Basic. 6 7.2 Dialing 7 7.3 Originating Call Blocking 7 7.4 Alternate Routing . 7 7.5 Attendant/Staff Notification. 7 8 Determining Caller Location 8 8.1 Network Based Solutions to IP Telephony Caller Location 8 8.1.1 SNMP based solution 8 8.1.1.1 Switch ba
24、sed solution 8 8.1.1.2 LLDP-MED Enhancement of the Switch Based SNMP Solution . 10 8.1.2 DHCP tracker based solution for delivery of ECS LCI to endpoint. 12 8.1.2.1 Interface between DHCP server and Location Mapping Function (or Wall Jack Map) 13 8.1.3 LLDP-MED based solution for delivery of ECS LCI
25、 to Endpoint. 13 8.1.4 LLDP-MED based solution using direct LIS update by endpoint 15 8.1.5 Enterprise Wide-Area Network 16 8.1.6 The Transient User 16 8.2 Set-based Solutions 16 8.2.1 Positioning Beacon . 17 8.2.2 Bluetooth 17 9 Providing Caller Location Information for Selective Routing and for De
26、livery to PSAP. 18 9.1 Call Setup Associated Signaling of Location Information. 19 9.2 Non-Call Setup Associated Signaling of Location Information 19 9.2.1 Associating Location Objects with a Location Query Key 19 9.2.1.1 Example 19 9.2.1.2 Interface between IP Device and Location Update function .
27、22 9.2.2 Sending Non-Call Associated Updates of Location Information to E911 Databases. 22 ii 10 Location Information Server (LIS) 24 10.1 LIS Functions . 24 10.2 LIS Configuration. 25 10.3 LIS Mapping Data 25 10.3.1 LAN Switch Based Method Mapping Data 25 10.3.2 DHCP Based Method Mapping Data 28 10
28、.3.3 LLDP-MED Based Method Mapping Data 28 10.3.4 Non-Call Setup Associated Location Update Method Mapping Data 28 11 Related Activities . 28 12 Related ETSI activities (ETSI SR 002 180) . 29 Annex A : Prospective 30 TSB-146-A iii List of Tables Table 1, LIS Database. 26 Table 2, ELIN to ERL Mapping
29、 . 27 Table 3, IP Address/Router resolution 27 FOREWORD This Telecommunication System Bulletin (TSB) contains information concerning IP Telephony support for Emergency Calling Service (ECS), better known as Enhanced 911 in US and Canada. It addresses calls placed from IP Telephone terminals connecte
30、d to an Enterprise IP. This document was prepared by subcommittee TR-41.4 (IP Telephony Infrastructure) of TIA. A TSB is not an industry standard, and compliance with its contents is not mandatory. This information is an extension to the current ANSI/TIA-689-A-2003, for IP Telephony support of ECS.
31、We encourage parties with additional information or contrary views to contact us so that all concerns may be addressed in an open process. The TR-41.4 IP Telephony Infrastructures Subcommittee (Chair: Avaya, Joanne McMillen, Vice Chair: Nortel, Roger Britt and Secretary: Avaya, Joachim Pomy) acknowl
32、edges the contributions provided by the following individuals in the development of this TSB. Name Representing Previous Versions TSB-146-A Nadine Abbott Telcordia null Manfred Arndt Hewlett Packard null Bob Bell Cisco Systems null null Peter Blatherwick Mitel Networks null Roger Britt Nortel Networ
33、ks null null Tony Caggiano Lucent Technologies null Dick Frank Siemens null Dick Frank Dietrich Lockard Group null Raymond Gass Alcatel Editor Richard Hatherill Mitel Networks null Marc Linsner Cisco Systems Editor null Dorothy Lockard Dietrich Lockard Group null null Joanne McMillen Avaya Inc. null
34、 null Kirit Patel Cisco Systems null null Dave Vander Maiden Siemens null null Arnaud Vergnol Alcatel Editor Mo Zonoun, Nortel Networks Editor iv TSB-146-A Suggestions for improvement of this document are welcome. They should be sent to: Telecommunications Industry Association Engineering Department
35、 Suite 300 250 Wilson Boulevard Arlington, VA 22201 v TSB-146-A 1 Introduction This TSB reviews the problems that need to be solved to support Emergency Calling Service (ECS) from IP Telephony terminals connected to an Enterprise IP network. It addresses various Enterprise Network (EN) topologies, a
36、nd describes possible solutions. The ECS in US and Canada is known as E911. An explanation of how E911 calling works may be found in 1. That TSB provides information that was used to develop 2, a standard for PBX and KTS support of enhanced 911 calling. But, that standard was written before IP Telep
37、hony was a practical consideration. This TSB provides information that should be useful in addition to referenced standards. IP Telephony, sometimes called Voice-over-Internet-Protocol (VoIP), is a new and evolving technology. When an EN provides IP Telephony service, it needs to solve the same E911
38、 support problems faced by conventional telephony. It needs the capability of determining the callers location and call back number, routing the call to the appropriate Public Safety Answering Point (PSAP), and conveying the location and call back information to that PSAP. But, IP Telephony needs ne
39、w solutions to accommodate its unique features. 2 Scope Emergency calling solutions exist to retrieve users information and geolocation for both E.164 and PLMN telephone networks: An E.164 emergency call relies on the public phone directory to retrieve information; A PLMN emergency call relies on Ce
40、ll Ids and radio triangulation process to retrieve information. This TSB covers issues associated with support of ECS from IP Telephony terminals connected to an Enterprise Network (EN). It describes new network architecture elements needed to support ECS, and the functionality of those new elements
41、, in North America. Many countries have similar ECS requirements. Portions of this document may be applicable in providing guidance in solutions for those requirements. This TSB addresses ECS calls placed from fixed, mobile, remote dial-in, or wireless access VoIP terminals, as shown in Figure 1. Th
42、is figure also illustrates similar access scenarios for ECS calls placed directly through an ISP. Solutions contained within this TSB may apply to the non-enterprise environment as well. This TSB does not address scenarios for devices connected to VoIP networks through gateways. Use cases: (A) EN ma
43、y be directly accessed by the users terminal, without crossing a tiers network. (B) EN may also be accessed through one (or several) tiers network(s): o (B.1) Case of multi-site enterprises, using leased-links to connect distant sites; o (B.2) Case of public access point based connection, using VPN
44、o (B.3) Case of private (residential) access point based solution, also using VPN. 1 (C) EN may finally be accessed by a “guest” terminal, that doesnt belong to the enterprise fleet, but that anyway tries to setup an emergency call. Cases (A) and (B.1) are covered by immediate solutions, while cases
45、 (B.2), (B.3) and (C) are mentioned for further study, some material being proposed in the document annexes. Many ECS support issues will require further investigation, and are beyond the scope of this document. These include for example: Dialing procedures Call Reliability Call set-up delay Call qu
46、euing Calling feature override (e.g. call forwarding, call waiting, call conferencing, caller ID suppression, call priority interruption 18 and do not disturb.) Access by persons with disabilities (e.g. TDD devices) Language-based call routing Use of a Private Safety Answering Point Transmission of
47、supplementary call data (e.g. biometrics) Please note that using managed, switched infrastructure described in this TSB does not necessarily provide a solution for the problem of remote access via VPN connectivity It also assumes that a sufficient number of local tandem ECS trunk connections exist t
48、o allow for routing to the appropriate PSAP. LAN IP Phone Mobile IP Phone PSTN Router ALI DatabasePSAP A Terminal Agent A Agent B Agent X E911 switch Figure 1. ECS Network Configuration 2 TSB-146-A 3 References The following standards and TSBs contain provisions, which are referenced in this documen
49、t. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. PBX and KTS Support of Enhanced 9-1-1 Emergency Service Calling, TIA/EIA-689-A-.2003 2. Network Interfaces for E9-1-1 and Emerging Technologies, NENA Technical Information Document, Is
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