911 and VoIP Where are you calling from

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9-1-1 and VoIPWhere are you calling from?

• InfraGard Conference
• April 2, 2008

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Agenda

• The Old Days
• 911 Call Routing
• Wireline Calls
• Phase I Wireless
• Phase II Wireless
• VoIP Current Status
• Future Routing Issues

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Voice Telephone Network OverviewTraditional
Residential/Business Calls
Public Switched Telephone Network
Residential
Local Tandem Office
Local Central Office (End Office)
Local Central Office (End Office)
Business
Other End Offices)
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Voice Telephone Network OverviewTraditional Long
Distance Call Routing
IXCs POP
IXCs POP
IXCs Network
Residential
Local Central Office (End Office)
Toll Tandem Office
Toll Tandem Office
Local Central Office (End Office)
CITY B
CITY A
Business
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Wireless E911Phase I

• Route the call to the right PSAP
• Provide the callback number

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ANI Automatic Number IdentificationPseudo
ANI A phone number used only for the duration
of the call to route the call to the PSAP.also
called an ESRKEmergency Service Routing Key
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Phase II

• Route the call to the right PSAP
• Provide the callback number
• Provide Lat/Long Location Within
• Network,
• 100 meters 67
• 300 meters 95
• Handset,
• 50 meters 67
• 150 meters 95
• Confidence Factor Estimate

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• VoIP Home and
• Small Business Phones
• Dial like a phone
• Quack like a phone
• Replace a phone
• Generate calls for help like a phone
• Pose problems for E9-1-1 agencies
• Would drain public safety revenue

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• VoIP CONCERNS
• Misroutes from Corporate Systems
• Misroutes from VoIP Providers
• VoIP calls to 10-digit admin. number
• Non-compliance with E9-1-1 routing
• Non-compliance with 9-1-1 fees
• Federal policy New Ruling

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3rdPARTY
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The i2 9-1-1 Network
LEC
CLEC
Wireless
PDE
ESGW
Call Server
VoIP End Point
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• Two New databases
• Will Emulate functions performed
• by landline 9-1-1 databases
• 1. VDB Validation Database
• Used when subscriber registers address
• Civic, Postal to
• MSAG valid address

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• Two New databases
• 2. ERDB Emergency Routing Database
• Used during 9-1-1 call to determine routing
• Provides routing instructions based on location
• Identifies the specific ESZ for the location
• Provides MSAG valid address

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NENA NG9-1-1 Architecture
March 2007
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QUESTIONS?Lucien JonesOklahoma City Public
Safety Communications Centerlucien.jones_at_okc.gov