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Internet Real-Time Lab, Columbia University NG9-1-1 Prototype Demo Jong Yul Kim, Wonsang Song, and Henning Schulzrinne.

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Presentation on theme: "Internet Real-Time Lab, Columbia University NG9-1-1 Prototype Demo Jong Yul Kim, Wonsang Song, and Henning Schulzrinne."— Presentation transcript:

1 Internet Real-Time Lab, Columbia University 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 LoST Cluster SIP proxy call taker SOS caller (1)Location Location + Service Identifier (2) INVITE PSAP URL To: urn:service:sos (5) INVITE PSAP URL To: urn:service:sos (6)(4) dial emergency dial- string or push emergency button Emergency Call Flow (3) PSAP URL + emergency dial-string INVITE call taker From: caller (7)(7) Media Stream

13 Demo 1 : Location Determination DHCP CDP SkyHook

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

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 Taken from 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

17 Demo 2 : LoST

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

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 SUBSCRIBENOTIFY INVITE REDIRECT INVITE

25 Demo 9 : Overflow Control SUBSCRIBENOTIFY 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 An Enhanced VoIP Emergency Services Prototype –Jong Yul Kim, Wonsang Song, and Henning Schulzrinne –ISCRAM 2006, May 2006 More information available on


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