NG9-1-1 Prototype Demo

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 callers location and other information on
  a local map
• Shows nearby responders on map
• Implementation
• Geolynx Mapping System from GeoComm
• Google Maps

12
Emergency Call Flow
LoST Cluster
SOS caller
SIP proxy
call taker
13
Demo 1 Location Determination

• DHCP
• CDP
• SkyHook

14
DHCP for Location

• Mainly for stationary users
• We modified ISCs 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
• -gt 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.edu8080/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