Inventors:
Richard Dickinson - Seattle WA, US
John Gordon Hines - Kirkland WA, US
Jonathan Croy - Seattle WA, US
Assignee:
TeleCommunication Systems, Inc. - Annapolis MD
International Classification:
H04M 11/04
US Classification:
4554041, 4554042, 455521, 455560, 455561, 4555621, 370351, 370352, 370353, 370354, 370356, 379 37, 379 45, 379 49
Abstract:
An emergency call (e. g. , a 911 call, an alarm company call) forwarded by a telematics call center is routed over the switched PSTN to a Voice Over Internet Protocol (VoIP) call server, where the switched call is converted to a session initiating protocol (SIP) packetized IP call for presentation to an emergency services gateway, which reconverts the call to TDM and connects to a selective router via dedicated circuits, gaining full access to the Enhanced 911 network. This provides a PSAP receiving a call from a telematics call center or other call center with all features available in an Enhanced 911 network, e. g. , callback number of the 911 caller, and location of the 911 caller. Location of the caller is provided using a VoIP positioning center (VPC).