Telecommunications – Radiotelephone system – Emergency or alarm communication
Reexamination Certificate
2011-03-22
2011-03-22
Taylor, Barry W (Department: 2617)
Telecommunications
Radiotelephone system
Emergency or alarm communication
C455S404200
Reexamination Certificate
active
07912446
ABSTRACT:
An E-9-1-1 voice-over-IP (VoIP) solution is provided wherein a 911 call from a mobile VoIP device is routed directly to the correct Public Safety Answer Point (PSAP) via dedicated trunks, together with correct location information and call-back number. VoIP gateways are implemented locally, at least one per LATA, and accept VoIP packetized data inbound, and convert it to standard wireline voice calls. Calls are routed to an IP address at the VoIP gateway, which then egresses the call to a voice port at a selective router. Mid-call updating of location of a moving VoIP terminal is provided to a PSAP. The location of the VoIP is validated using HTTP based protocol by pushing location information to a VoIP location server, and comparing it against a geographic location database to confirm that a contained street address is valid.
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patent
Dickinson Richard
Helme Steven P.
Marshall Roger
Zhu Yinjun
Bollman William H.
Taylor Barry W
TeleCommunication Systems Inc.
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