NENA Technical Information Document on the Network Interface to IP Capable PSAP
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NENA Technical Information Document on the Network Interface to IP Capable PSAP NENA-08-501 Issued June, 2004 - NENA Technical Information Document on the Interface between the E9-1-1 Service Provider Network and the Internet Protocol (IP) PSAP Prepared by: National Emergency Number Association (NENA) Migration Working Group of the Network Technical Committee Published by NENA Printed in USA NENA NENA Technical Information Document on Network to IP PSAP Interface – NENA-08-501, Issue 0, June 2004 (Original) TECHNICAL Information Document NOTICE This Technical Information Document is published by National Emergency Number Association (NENA) as technical information to guide providers of Emergency Service Networks and Data and their equipment suppliers, and for the designers and manufacturers of customer-premise systems that are used for the purpose of processing emergency calls at a Public Safety Answering Point (PSAP). It is not intended to provide complete design specifications or parameters nor to assure the quality of performance of such equipment. NENA reserves the right to revise this Technical Information Document for any reason including, but not limited to, conformity with criteria or standards promulgated by various agencies, utilization of advances in the state of the technical arts or to reflect changes in the design of equipment or services described therein. It is possible that certain advances in technology will precede these revisions. Therefore, this Technical Information Document should not be the only source of information used to implement network changes or to purchase Customer Premise Equipment (CPE). NENA members are also advised to contact their Telephone Company representative to ensure CPE compatibility with the Telco network. The techniques or equipment characteristics disclosed herein may be covered by patents of some Corporations or others. No license expressed or implied is hereby granted. This document is not to be construed as a suggestion to any manufacturer to modify or change any of its products, nor does this document represent any commitment by NENA or any affiliate thereof to purchase any product whether or not it provides the described characteristics. This document has been prepared solely for the voluntary use of E9-1-1 service providers, E9-1-1 equipment suppliers, and participating telephone companies. By using this document, the user agrees that the NENA will have no liability for any consequential, incidental, special, or punitive damage that may result. This draft document is based on the DRAFT NENA Standard for Creating Or Updating E9-1-1 Technical References developed by the NENA PSAP standards Committee and further developed by the NENA Technical Committee Chairs. The NENA executive board has NOT recommended that document for industry acceptance. This draft document is being proposed as a draft. Recommendations for changes to this document may be submitted to: National Emergency Number Association 4350 N. Fairfax Dr, Suite 750 Arlington, VA 22203 800-332-3911 ii NENA Technical Information Document on Network to IP PSAP Interface – NENA-08-501, Issue 0, June 2004 (Original) Acknowledgments: This document has been developed by the National Emergency Number Association (NENA) Migration Working Group. The following industry experts and their companies are recognized for their contributions in development of this document. Group Leader: Nathan Wilcox State of Vermont Enhanced 9-1-1 Members: Company Nadine Abbott Telcordia Anand Akundi Telcordia Spencer Angel CML Richard Atkins Tarrant County 9-1-1 District Chuck Bell Sprint Jim Beutelspacher State of Minnesota Eileen Boroski Intrado Tom Breen BellSouth Larry Ciesla Intrado Kevin Eckhardt Zetron Pete Eggiman Metro 911 Board, St Paul, Mn Richard Frye Orbacom Systems Jay Fuller Plant Equipment John Gerberg SBC Pacific Bell Steve Gillies ACX Roger Hixson NENA Bill Johnson Orbacom Systems Scott Keagy Cisco Systems Gordon Kelly CML Mark Knox Intrado Ron Mathis Intrado iii NENA Technical Information Document on Network to IP PSAP Interface – NENA-08-501, Issue 0, June 2004 (Original) Robert Miller RCC Martin Moody State of Minnesota Mark Payne Denco Area 9-1-1 District Kantu Patel SBC/Pacbell Nancy Pollock Metro 911 Board, St Paul, Mn Keith Ritchie Bell Canada Jim Rusmisel PSAP Data Resources Joseph Sallak J&J Consulting Peter Schmidt Intrado Henning Schulzrinne Columbia University Steve Sipple Nortel Networks Allan Spivey Zetron Francois St Amand CML Atul Thaper Telcordia Wes Tilley Nortel Networks Mike Vislocky Network Orange iv NENA Technical Information Document on Network to IP PSAP Interface – NENA-08-501, Issue 0, June 2004 (Original) TABLE OF CONTENTS TABLE OF CONTENTS ...........................................................................................................................................V 1 EXECUTIVE OVERVIEW .......................................................................................................................... 1-1 1.1 PURPOSE AND SCOPE OF DOCUMENT ........................................................................................................... 1-1 1.2 REASON TO IMPLEMENT ............................................................................................................................... 1-1 1.3 BENEFITS AND RISKS ................................................................................................................................... 1-1 1.4 TERMS AND DEFINITIONS............................................................................................................................. 1-3 1.5 EFFECTIVE DATE.......................................................................................................................................... 1-3 1.6 DOCUMENT TERMINOLOGY.......................................................................................................................... 1-3 1.7 REASON FOR REISSUE .................................................................................................................................. 1-4 1.8 DATE COMPLIANCE...................................................................................................................................... 1-4 1.9 MAJOR INITIATIVES: .................................................................................................................................... 1-4 2 TECHNICAL DESCRIPTION..................................................................................................................... 2-6 2.1 NETWORK TO PSAP INTERFACE OVERVIEW ................................................................................................ 2-6 2.1.1 Architecture............................................................................................................................................ 2-6 2.1.2 Internet Protocol Stack........................................................................................................................... 2-9 2.1.2.1 Physical Layer – Layer 1 ............................................................................................................................... 2-9 2.1.2.2 Data Link Layer – Layer 2............................................................................................................................. 2-9 2.1.2.3 Network Layer – Layer 3............................................................................................................................. 2-10 2.1.2.4 Transport Layer – Layer 4 ........................................................................................................................... 2-10 2.1.2.5 Application Layers....................................................................................................................................... 2-10 2.1.3 VoIP Media Protocols .......................................................................................................................... 2-10 2.1.4 VoIP Signaling Protocols..................................................................................................................... 2-10 2.1.4.1 H.323 Protocol Overview............................................................................................................................. 2-11 2.1.4.2 H.248 (MEGACO) Protocol Overview........................................................................................................ 2-11 2.1.4.3 Session Initiation Protocol (SIP) Overview ................................................................................................. 2-11 2.2 CALL CAPACITY MANAGEMENT – BANDWIDTH MANAGEMENT .................................................................. 2-12 2.3 VOICE CALL FUNCTIONALITY .................................................................................................................... 2-12 2.3.1 Terminating Emergency Calls.............................................................................................................. 2-12 2.3.1.1 Network Call Distribution Functions (optional)........................................................................................... 2-12 2.3.1.2 Type of Call ................................................................................................................................................. 2-14 2.3.1.3 Delivery of Emergency Call Related Information........................................................................................ 2-14 2.3.1.4 Alerting .......................................................................................................................................................