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NG9-1-1 Prototype Demo: Location Determination, Multimedia, Mapping, and More

Explore a demo showcasing a NG9-1-1 prototype with features like call routing, multimedia, callback, and overload control. Learn about the architecture, components, and future work.

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NG9-1-1 Prototype Demo: Location Determination, Multimedia, Mapping, and More

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  1. NG9-1-1 Prototype Demo Jong Yul Kim, Wonsang Song, and Henning Schulzrinne

  2. Overview • Prototype Architecture and Components • Demonstration of Features • Demo 1 : Location determination • Demo 2 : Call Routing • Demo 3 : Multimedia and Mapping • Demo 4 : Inviting third party • Demo 5: Fully Mute / Partially Mute • Demo 6 : Callback • Demo 7 : Logging • Demo 8 : Queue • Demo 9 : Overload Control

  3. Prototype Architecture

  4. SIPc, a multi-function SIP UA • Function (caller side) • Identifies and initiates emergency call • Determines location from various sources • Function (calltaker side) • Interfaces with location mapping software • Shows calltaker status, responder list, incident type • Implementation • Tcl/Tk based User Interface and SIP stack • External programs for audio, video, application sharing, stun, etc.

  5. Location Information Sources • Function • Provides location information to SIPc • Implementation • GPS : USB device and NMEA 0183 parser • Location Information Server built using Apache, MySQL, and PHP

  6. LoST Cluster • Function • Translates (Location, Service) to a PSAP URL and emergency dial string • Verifies civic address • Implementation • PostgreSQL with PostGIS extension as a Database • US county boundary polygons to simulate geo PSAP boundary • Sample MSAG data for civic PSAP boundary • Tomcat + Axis for Web Service

  7. sipd, a SIP proxy and registrar • Function • Routes call to destination • Resolves SIP URL to a reachable address • Invokes sip-cgi for in-network special services • Implementation • CINEMA (Columbia InterNet Extensible Multimedia Architecture) • sip-cgi is perl-based

  8. psapd, a back-to-back SIP UA • Function • Facilitates multi-party conference setup • Distributes incoming call to call takers • Logs call details • Implementation • CINEMA C++ library (libsipapi) • Call distribution logic is written in Tcl

  9. psapd handles an incoming call • All signals go through psapd • psapd controls conference instances through MSCML • Media is directed to conference server

  10. Conference Server • Function • Mixes and records audio • Distributes video • Call Queuing • Interactive Voice Response • Implementation • sipconf from CINEMA • Snowshore IP Media Server from Cantata Technology

  11. Location Mapping Software • Function • Plots caller’s location and other information on a local map • Shows nearby responders on map • Implementation • Geolynx Mapping System from GeoComm • Google Maps

  12. (2) Location + Service Identifier (3) PSAP URL + emergencydial-string (1) Location INVITE call taker From: caller <Location> (7) INVITE PSAP URL To: urn:service:sos <Location> (5) (4) INVITE PSAP URL To: urn:service:sos <Location> (6) dial emergency dial-string or push emergency button Media Stream Media Stream Emergency Call Flow LoSTCluster SOS caller SIP proxy call taker

  13. Demo 1 : Location Determination • DHCP • CDP • SkyHook

  14. DHCPINFORM [MAC=00:11:20:9d:a0:03] request or response DHCPACK [option=0:US:1:NY:2:NEW YORK: 3:NEW YORK:6:AMSTERDAM:19:1214] DHCP Server DHCP for Location • Mainly for stationary users • We modified ISC’s dhcpd to generate location information • Use MAC address to get location information

  15. CDP for Location • Mainly for stationary and nomadic users • Cisco Discovery Protocol (Layer2) • Cisco switches broadcast switch/port ID periodically. • A Switch covers a floor, a port leads to a jack in a room -> room-level accuracy

  16. SkyHook for Location • Mainly for nomadic, mobile users • Wireless device receives signals from Wi-Fi sites in range • Skyhook compares signals to its database of geographically known locations • Location data is used to direct safety services Taken from http://www.skyhookwireless.com

  17. Demo 2 : LoST http://honamsun.cs.columbia.edu:8080/index.jsp

  18. Demo 3 : Multimedia and Mapping

  19. Demo 4 : Inviting third party

  20. Demo 5 : Fully / Partially Mute

  21. Demo 6 : Callback

  22. Demo 7 : Logging http://ng911serv.cs.columbia.edu/psap/

  23. Demo 8 : Automatic Call Distribution • Based on availability of call taker • Language-based distribution • Queue • Auto-Response based on time and location of new incoming call

  24. Demo 9 : Overflow Control SUBSCRIBE NOTIFY INVITE REDIRECT INVITE

  25. Demo 9 : Overflow Control SUBSCRIBE NOTIFY INVITE INVITE

  26. Future Work • Implement additional Features • Auto-Response based on time and location of incoming call • Video Push to caller (e.g. CPR how-to) • Measuring and reducing latency

  27. More Information • A VoIP Emergency Services Architecture and Prototype • Matthew Mintz-Habib, Anshuman Rawat, Henning Schulzrinne, and Xiaotao Wu • ICCCN 2005, Oct. 2005 • An Enhanced VoIP Emergency Services Prototype • Jong Yul Kim, Wonsang Song, and Henning Schulzrinne • ISCRAM 2006, May 2006 • More information available on http://ng911.tamu.edu

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