1. NG 911 Project Wonsang Song, Jong Yul Kim, and Henning Schulzrinne Internet Real-Time Lab, Columbia University

2. 2 Overview Project goals Four phases of an emergency call 1)Call identification 2)Determining caller location 3)Routing to call center 4)Call presentation

3. 3 Project Goals Develop a prototype system that routes emergency calls over SIP based VoIP networks. Implement requirements for IP-based PSAP Provide opportunities to enhance 911 system: –Multimedia (audio, video, text) –Data delivery (floor plan, CPR how-to) –Language-based routing

4. 4 Four Phases of Emergency Calling Phase 1Phase 2Phase 3Phase 4

5. 5 Phase 1 : Identifying Emergency Calls Emergency URI –sip:sos@irt.cs.columbia.edu Identification by number –(911, 112) -> sip:sos@irt.cs.columbia.edu

6. 6 Phase 2 : Determining Caller Location Different types of callers –stationary, nomadic, or mobile Different types of solution CDPDHCPGPSManual Entry Merits  Cisco devices are ubiquitous  Less burden for administrators than DHCP  DHCP is ubiquitous  Applicable to both SIP UA and SIP proxy  Delivers precise location  No work for administrators  Is always a backup method Drawbacks  Only works with Cisco switches and access points  Administrators have to enter switch – location mapping  No good for wireless connections  Administrators have to enter machine – location mapping for each machine  GPS does not work indoors or when a significant portion of the sky is blocked from view.  No guarantee of timely update  Prone to human error Useful Situation In organizations that use Cisco devices In organizations where computers are fixed in one place OutdoorsWhen all else fails

7. 7 Phase 3 : Routing to Correct PSAP Which PSAP should the call go to? –Usually to the PSAP that covers the area –Sometimes to a backup PSAP –If no location, then ‘default’ PSAP PSAP determination –DNS-SOS –LUMP : Location-to-URL Mapping Protocol

8. 8 Phase 4 : Call Presentation in PSAP

9. 9 Screenshot of a call taker

10. 10 Thank you! Question?