Transcript NENA presentation

A prototype i3 VoIP PSAP
implementation
Henning Schulzrinne, Anshuman Rawat, Matthew Mintz-Habib,
Xiaotao Wu and Ron Shacham
Dept. of Computer Science
Columbia University
Walt Magnussen, Willis Marti, Patti Urbina
Chris Norton, Clark Yang, Karthik Kannan
Internet2 Technology Evaluation Center
Texas A&M University
NENA-VON
VoIPCIF
Santa Clara, CA
December 2004
Overview
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A quick review of I3 assumptions
Goals of project
Prototype architecture and experiences
Scaling and robustness
Next steps
Our I3 assumptions
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VoIP (SIP) capable end systems
SIP-capable PSAP
Location inserted by origin
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outbound proxy
originating device (e.g., via DHCP)
either geospatial or civic location
Goals of prototype
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Provide a platform for quick experimentation
Determine easy vs. hard parts of problem
Experiment with redundancy and robustness
Use off-the-shelf components where possible
Modes
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Phase II wireless (based on ALI lookup)
I3 VoIP end-to-end, with in-band location
information
Components
sipd
SIP proxy server
database-backed DNS server
SIP phone
web server
SQL database for call routing
sipc
SIP user agent
geo-coding, PSAP boundaries
GIS software for call location plotting
No endorsement implied – other components likely will work as well
Prototype
* gray features in progress.
Demo prototype
Ft. Wayne, IN: August 17, 2004
Call routing
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PSAP lookup depends on location type:
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DNS for civic locations
Mapinfo Envinsa for geo location
Detail: I3 - DNS-based resolution
DHCP INFORM
psap.state.vt.gov
SIP w/location
MAC  loc
Perl sip-cgi script
psap.state.vt.gov
DNS NAPTR:
addison.vt.us
algonquin-dr.addison.vt.us
…
151.algonquin-dr.addison.vt.us.sos-arpa.net
proprietary
TCP-based
protocol
Call taker setup
SIPc client receives calls
GeoLynx software displays
caller location
sipc receives call
GeoLynx displays location
Caller information
GeoLynx
location
receives
listens
displayed
fordisplayed
commands
commands
on map.
inand
GUI.
from
displays
SIPc…location.
Demo Ft. Wayne, IN (August 17, 2004)
Using IP phones for voice
redundant sipd’s
XML display
shows caller location
Apache
web server
XML display
with HTTP retrieval
Emergency call conferencing
PSAP brings all related
parties into a conference call
Hospital
Fire
department
INVITE
INVITE
Conference
server
Recorder
REFER
3rd party
call control
media
INVITE info
INVITE
INVITE
REFER
REFER
INVITE
media
info
Caller
PSAP
Scaling
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NENA: “estimated 200 million calls to 9-1-1 in
the U.S. each year”
 approximately 6.3 calls/second
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if 3 minute call, about 1,200 concurrent calls
typical SIP proxy server (e.g., sipd) on 1 GHz
PC can handle about 400 call arrivals/second
thus, unlikely to be server-bound
Next steps for our prototype
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Custom user interface for call taker
Add voice recording and conferencing
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“Data mining”
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using our software conference server
collect and display statistical data about calls
Integration of police/fire/EMS
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direct transmission of call-related data via simple
IM application  requires only Internet access
Difficulties
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Difficult to get good test environment
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access to PDE
IP access to ALI (often, jury-rigged telnet
interfaces)
access to MSAG and ALI data
“friendly” PSAPs one option
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but open, network-accessible test lab would be better
longer-term: may need “plug fests”
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see SIPit effort – vendors collaborating in friendly, nonpublic interop test efforts  rapid elimination of protocol
and implementation problems
Conclusion
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A first prototype of I3 PSAP
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integrates Phase II wireless call delivery
Shown that it is possible to integrate existing
GIS applications with I3
Based on COTS technology, with modest
modifications
Additional operational support in progress
NTIA VoIP i3 PSAP Project
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Partners
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Texas A&M University
Columbia University (Dr. Henning Schulzrinne co-PI)
The University of Virginia
National Emergency Number Association (NENA)
The State of Texas Commission on State Emergency
Communications (CSEC)
The State of Virginia Division of Public Safety Communications of
the Virginia Information Technologies Agency (VITA).
Internet 2
Brazos County Texas E911 District
City of College Station Texas
Cisco
Nortel
Project Goals & Duration
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To build and install in an operational PSAP an
i3 PSAP prototype system
Provide functional comparison to existing i2
systems
Provide VoIP E911 workshops designed to
expand Internet based 911 services
awareness
Project to begin on 1 October, 2004 and
conclude on 31 September, 2006
Project Responsibilities
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Columbia University – development of I3
components.
TAMU ITEC – I3 field trial and coordination
with PSAP entities.
Cisco and Nortel – Support I2 installations
Thank you – Now for Questions
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Contact info –
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Walt Magnussen
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[email protected]
Ph 979-845-5588
Henning Schulzrinne
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[email protected]
Ph 212-939-7005