Telephonic communications – Emergency or alarm communications – Central office responsive to emergency call or alarm
Reexamination Certificate
2005-09-06
2005-09-06
Chan, Wing (Department: 2643)
Telephonic communications
Emergency or alarm communications
Central office responsive to emergency call or alarm
C379S037000, C455S404200, C370S352000
Reexamination Certificate
active
06940950
ABSTRACT:
An E-9-1-1 voice-over-IP (VoIP) solution is provided wherein a 911 call from a wireless 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. Dedicated voice trunks (CAMA, SS7, FG-D) are installed between each local VoIP gateway and appropriate selective routers. An Automatic Location Identification (ALI) database is provisioned with ESRKs dedicated for VoIP use. TCP/IP circuits may be established between some or all of the various local VoIP gateways.
REFERENCES:
patent: 6650901 (2003-11-01), Schuster et al.
patent: 6678357 (2004-01-01), Stumer et al.
Dickinson Richard
Helme Steven P.
Marshall Roger
Bollman William H.
Chan Wing
TeleCommunication Systems Inc.
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