1、 ATIS-0500037 ATIS Technical Report on Overview of how an IMS Originating Network Interfaces to an E9-1-1 or NG9-1-1 System Alliance for Telecommunications Industry Solutions Approved June 2018 Abstract This Technical Report provides an overview of ATIS-0700015.v003, Implementation of 3GPP Common IM
2、S Emergency Procedures for IMS Origination and ESInet/Legacy Selective Router Termination, that may aid Public Safety in understanding the application of this standard as it relates to the migration to NG9-1-1. ATIS-0500037 ii Foreword The Alliance for Telecommunications Industry Solutions (ATIS) se
3、rves the public through improved understanding between carriers, customers, and manufacturers. The Emergency Services Interconnection Forum (ESIF) provides a forum to facilitate the identification and resolution of technical and/or operational issues related to the interconnection of wireline, wirel
4、ess, cable, satellites, Internet, and emergency services networks. The mandatory requirements are designated by the word shall and recommendations by the word should. Where both a mandatory requirement and a recommendation are specified for the same criterion, the recommendation represents a goal cu
5、rrently identifiable as having distinct compatibility or performance advantages. The word may denotes an optional capability that could augment the standard. The standard is fully functional without the incorporation of this optional capability. Suggestions for improvement of this document are welco
6、me. They should be sent to the Alliance for Telecommunications Industry Solutions, Emergency Services Interconnection Forum (ESIF), 1200 G Street NW, Suite 500, Washington, DC 20005. At the time of consensus on this document, ESIF, which was responsible for its development, had the following leaders
7、hip: R. Hixson, ESIF Chair (NENA) R. Marshall, ESIF 1stVice-Chair (Comtech) J. Green, ESIF 2nd Vice-Chair (Sprint) C. Militeau, ESIF NGES Co-Chair (West Safety Service) T. Reese, ESIF NGES Co-Chair (Ericsson) The Next Generation Emergency Services (NGES) Subcommittee was responsible for the developm
8、ent of this document. ATIS-0500037 iii Table of Contents 1 Scope, Purpose, & Application 1 2 Normative References . 1 3 Informative References 1 4 Definitions, Acronyms, & Abbreviations . 2 4.1 Definitions 2 4.2 Acronyms & Abbreviations . 4 5 Assumptions 4 6 Conceptual Architecture 5 7 Originating I
9、MS Network Call Routing Criteria . 6 8 Delivering Calls to a Legacy Emergency Services Network 7 9 Delivering Calls to an NG9-1-1 ESInet 8 10 Data Management 9 11 Future Considerations 9 Table of Figures Figure 6.1: Simplified Conceptual Architecture 6 Figure 8.1: Simplified Conceptual Legacy Archit
10、ecture . 7 Figure 9.1: Simplified Conceptual NG9-1-1 Architecture . 8 ATIS TANDARD ATIS-05037 ATIS Standard on Overview of how an IMS Originating Network Interfaces to an E9-1-1 or NG9-1-1 System 1 1 Scope, Purpose, & Application This Technical Report provides an overview of interfaces between IP Mu
11、ltimedia Subsystem (IMS)-based carriers and Public Safety 9-1-1 service systems (as described in ATIS-0700015). ATIS-0700015, Implementation of 3GPP Common IMS Emergency Procedures for IMS Origination and ESInet/Legacy Selective Router Termination, identifies and adapts as necessary 3GPP common IMS
12、emergency procedures for applicability in North America. IMS is a global telecommunications standard developed by 3GPP that supports emergency communications originating from an IMS subscriber (fixed, nomadic, or mobile) and delivered to an E9-1-1 system or to an NG9-1-1 Emergency Services IP networ
13、k (ESInet). The first version of this standard was limited to voice and Global Text Telephony (GTT1) communication. A subsequent version of ATIS-0700015 included procedures for addressing additional media (i.e., text, pictures, video) in support of Multimedia Emergency Services (MMES). For calls des
14、tined to legacy emergency services networks, ATIS-0700015 results in the same signaling when delivering emergency calls from IMS-based originating networks as for emergency calls from legacy originating networks. Therefore, operators of those networks and the Public Safety Answering Points (PSAPs) b
15、ehind them should expect no changes in their processes. For calls destined to NG9-1-1 ESInets, ATIS-0700015 results in the same signaling when delivering emergency calls from an IMS-based originating network as is defined for delivering calls from IP-based originating networks toward NG9-1-1 PSAPs.
16、Therefore, operators of ESInets and the PSAPs behind them should anticipate similar processes as with other IP-originating networks. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publica
17、tion, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Ref 1: ATIS-0700015.v003, Implementation of 3GPP Commo
18、n IMS Emergency Procedures for IMS Origination and ESInet/Legacy Selective Router Termination.2Ref 2: ATIS-0500026, Operational Impacts on Public Safety of ATIS-0700015, Implementation of 3GPP Common IMS Emergency Procedures for IMS Origination and ESInet/Legacy Selective Router Termination.23 Infor
19、mative References Ref 100: NENA-STA-010.2-2016 (originally 08-003), NENA Detailed Functional and Interface Standards for the NENA i3 Solution, Version 2.31In North America GTT is referred to as Real Time Text (RTT). 2This document is available from ATIS, 1200 G Street N.W., Suite 500, Washington, DC
20、 20005 at: . 3This document is available from the National Emergency Number Association (NENA). . 2 Ref 101: NENA-STA-005.1-2017, NENA Standards for the Provisioning and Maintenance of GIS data to ECRF and LVFs.3Ref 102: NENA-ADM-000.21.1-2018, NENA Master Glossary of 9-1-1 Terminology.4Ref 103: Tas
21、k Force on Optimal Public Safety Answering Point Architecture (TFOPA) Final Report and Supplements.5Ref 104: 3GPP 22.226, Global Text Telephony (GTT), Stage 1.6Ref 105: 3GPP 23.167, IP Multimedia Subsystem (IMS) emergency sessions.64 Definitions, Acronyms, & Abbreviations For a list of common commun
22、ications terms and definitions, please visit the ATIS Telecom Glossary, which is located at . 4.1 Definitions Term Description 3GPP 3rd Generation Partnership Project. A collaboration agreement that was established in December 1998. The collaboration agreement brings together a number of telecommuni
23、cations standards bodies which are known as “Organizational Partners”. 9-1-1 Authority A State, County, Regional or other governmental entity responsible for 9-1-1 service operations. For example, this could be a county/parish or city government, a special 9-1-1 or Emergency Communications District,
24、 a Council of Governments, or other similar body. Note that various types of responsibilities may apply, such as funding, planning, management, and/or operations of certain service components. Additional Data Data that further describes the nature of how the call was placed, the person(s) associated
25、 with the device placing the call, or the location the call was placed from. ALI Automatic Location Identification. The automatic display at the PSAP of the callers telephone number, the address/location of the telephone, and supplementary emergency services information of the location from which a
26、call originates. Working with Automatic Number Identification, the use of a database to associate a physical location with a telephone number. ALI is a feature of Enhanced 9-1-1 (E9-1-1) systems. ALI is provided to agents answering E9-1-1 calls. It may include information such as name, phone number,
27、 address, nearest cross street, and special pre-existing conditions. On some systems, it may also provide the appropriate emergency service address for the particular address. ALI is retrieved from a computer database that may be held on site or at a remote location. ANI Automatic Number Identificat
28、ion. Telephone number associated with the access line from which a call originates. Associated Location A location (civic, geodetic, or polygon) within the designated PSAP jurisdiction that may be used in wireless call scenarios to route a call toward the designated PSAP. The Associated Location is
29、determined via a static mapping from the cell/sector ID received in incoming signaling to a routing location which, when used to query the routing database, will return routing instructions that will cause the call to be directed toward the designated PSAP. BCF Border Control Function. Provides a se
30、cure entry into the ESInet for emergency calls presented to the network. The BCF incorporates firewall, admission control, and may include anchoring of session and media as well as other security mechanisms to prevent deliberate or malicious attacks on PSAPs or other entities connected to the ESInet
31、. By-Reference An identifier that when used in the correct manner by an authenticated and authorized entity to query for information will yield the requested information (e.g., location-by-reference or additional data-by-reference). By-Value Information included in the body of the call setup message
32、 (e.g., location-by-value or additional data-by-value). 4Available from the National Emergency Number Administration (NENA) at: . 5See . 6This document is available from the 3rdGeneration Partnership Project (3GPP). . 3 Term Description Cell Centroid A point within and at the center of the physical
33、coverage area of a cell tower sector, as represented in a Geographic Information System (GIS). E9-1-1 Enhanced 9-1-1. A telephone system which includes network switching, database, and PSAP premise elements capable of providing automatic location identification data, selective routing, selective tra
34、nsfer, fixed transfer, and a call back number. The term also includes any enhanced 9-1-1 service so designated by the Federal Communications Commission in its Report and Order in WC Docket Nos. 04-36 and 05-196, or any successor proceeding. ECRF Emergency Call Routing Function. A functional element
35、in an ESInet which is a LoST protocol server where location information (either civic address or geo-coordinates) and a Service URN serve as input to a mapping function that returns a URI used to route an emergency call toward the appropriate PSAP for the callers location or towards a responder agen
36、cy. External ECRF: An ECRF instance that resides outside of an ESInet instance. Internal ECRF: An ECRF instance that resides within and is only accessible from an ESInet instance. E-CSCF Emergency Call Session Control Function. The entity in the IMS core network that handles certain aspects of emerg
37、ency sessions e.g. routing of emergency requests toward the correct emergency center or PSAP. ESInet Emergency Services Internet Protocol (based) Network. An ESInet is a managed IP network used for emergency services communications that can be shared by all public safety agencies. It provides the IP
38、 transport infrastructure upon which independent application platforms and core services can be deployed, including, but not restricted to, those necessary for providing NG9-1-1 services. ESInets may be constructed from a mix of dedicated and shared facilities. ESInets may be interconnected at local
39、, regional, state, federal, national, and international levels to form an IP-based inter-network (network of networks). The term ESInet designates the network, not the services that ride on the network. ESRP Emergency Service Routing Proxy. A functional element which is a SIP proxy server that selec
40、ts the next hop routing within the ESInet based on location and policy. There is an ESRP on the edge of the ESInet. There is usually an ESRP at the entrance to an NG9-1-1 PSAP. There may be one or more intermediate ESRPs between them. Originating ESRP: The first routing element within the Next Gener
41、ation Core Services (NGCS). It receives calls from the BCF at the edge of the ESInet. Terminating ESRP: The last ESRP for a call in NGCS. GTT Global Text Telephony. The feature that add real time text conversation to any 3GPP conversational environment Ref 104. IBCF Interconnect Border Control Funct
42、ion. The IBCF is a Session Initiation Protocol (SIP) Application Level Gateway (ALG) designed to facilitate interconnection between two service provider domains. Similar in role to a Session Border Controller (SBC), the IBCF performs functions such as IPv4 to IPv6 interworking, network topology hidi
43、ng, SIP message screening, and transport plane control via the Transition Gateway (TrGW). IMS Internet Protocol Multimedia Subsystem. The IP Multimedia Subsystem comprises all 3GPP/3GPP2 core network elements providing IP multimedia services that support audio, video, text, and pictures alone or in
44、combination delivered over a packet-switched domain. LRF Location Retrieval Function. The IMS associated functional entity that handles the retrieval of location information for the emergency caller including, where required, interim location information, initial location information and updated loc
45、ation information. The LRF may interact with a separate RDF or contain an integrated RDF in order to obtain routing information for an emergency call. LS Location Server. The general term for the entity responsible for obtaining the location of the User Equipment Ref 105. MGCF Media Gateway Control
46、Function. A system used in certain Voice over IP telephony architectures. An MGCF controls a number of Media Gateways or Media Servers. The MGCF receives signaling information (like dialed digits) from the Media Gateway and can be instructed to alert the called party, send and receive voice data, et
47、c. MMES Multimedia Emergency Services. Next generation emergency services utilizing real-time session-based text and other multimedia, including voice, that are based on trusted applications in support of non-voice communications between citizens and Public Safety. NG9-1-1 Next Generation 9-1-1. NG9
48、-1-1 is an Internet Protocol (IP)-based system comprised of managed Emergency Services IP networks (ESInets), functional elements (applications), and databases that 4 Term Description replicate traditional E9-1-1 features and functions and provides additional capabilities. NG9-1-1 is designed to pro
49、vide access to emergency services from all connected communications sources and provide multimedia data capabilities for PSAPs and other emergency service organizations. Nomadic The nomadic user may move from one network connection to another but cannot maintain a communications session during that move. If the user is able to move over the course of the call without losing network connection then the user is considered to be mobile, not nomadic. Originating IMS Network An Originating IMS Network provides the ability for fixed nomadic or mobile users
