Enhanced E911 network access for a call center using session initiation protocol (SIP) messaging
First Claim
1. A method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP), comprising:
- determining a unique PSAP having jurisdictional responsibility for a physical current location of a switched telephone device calling to said call center;
converting said switched telephone call to said call center into a session initiation protocol (SIP) packetized phone call at said call center;
querying a VoIP positioning center for call routing instructions for said SIP packetized phone call; and
routing said SIP packetized phone call to an emergency services gateway based on said call routing instructions without further passage through a public switched telephone network (PSTN).
2 Assignments
0 Petitions
Accused Products
Abstract
A switched emergency call (e.g., a 911 call, an alarm company call) forwarded by a telematics call center is converted into a session initiation protocol (SIP) packetized phone call at the call center, and routed over an IP network, for presentation to an emergency services gateway, which 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), queried from the call center. In this way, the switched emergency call is converted into a SIP packetized phone call and routed without further passage through the public switched telephone network (PSTN).
116 Citations
12 Claims
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1. A method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP), comprising:
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determining a unique PSAP having jurisdictional responsibility for a physical current location of a switched telephone device calling to said call center; converting said switched telephone call to said call center into a session initiation protocol (SIP) packetized phone call at said call center; querying a VoIP positioning center for call routing instructions for said SIP packetized phone call; and routing said SIP packetized phone call to an emergency services gateway based on said call routing instructions without further passage through a public switched telephone network (PSTN). - View Dependent Claims (2, 3, 4, 6)
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5. (canceled)
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7. Apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP), comprising:
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means for determining a unique PSAP having jurisdictional responsibility for a physical current location of a switched telephone device calling to said call center; means for converting said switched telephone call to said call center into a session initiation protocol (SIP) packetized phone call at said call center; means for querying a VoIP positioning center for call routing instructions for said SIP packetized phone call; and means for routing said SIP packetized phone call to an emergency services gateway based on said call routing instructions without further passage through a public switched telephone network (PSTN). - View Dependent Claims (8, 9, 10, 12)
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11. (canceled)
Specification