Method and system for using a network-provided location for voice-over-packet emergency services calls
First Claim
1. A method for emergency services call routing, said method comprising:
- receiving from a client device, via a voice-over-packet (VoP) access network, a message requesting an emergency services call, said message including a client-provided location of said client device;
obtaining from said VoP access network a network-provided location of said client device;
determining whether said network-provided location and said client-provided location are consistent;
determining an appropriate public safety answering point (PSAP), from among a plurality of PSAPs, based on at least one of said network-provided location and said client-provided location; and
routing said emergency services call to said appropriate PSAP.
6 Assignments
0 Petitions
Accused Products
Abstract
A client device transmits, via a voice-over-packet (VoP) access network, a message that requests an emergency services call. An outbound proxy server receives the message and obtains a network-provided location of the client device, e.g., by looking up the source address of the message in a location database maintained by the access network or by invoking an active network location function. The outbound proxy server inserts the network-provided location into the message, leaving any client-provided location in the message undisturbed, and forwards the message to an emergency services routing server. The emergency services routing server determines which public safety answering point (PSAP) should receive the call, based on at least one of the network-provided location and any client-provided location in the message.
125 Citations
19 Claims
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1. A method for emergency services call routing, said method comprising:
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receiving from a client device, via a voice-over-packet (VoP) access network, a message requesting an emergency services call, said message including a client-provided location of said client device; obtaining from said VoP access network a network-provided location of said client device; determining whether said network-provided location and said client-provided location are consistent; determining an appropriate public safety answering point (PSAP), from among a plurality of PSAPs, based on at least one of said network-provided location and said client-provided location; and routing said emergency services call to said appropriate PSAP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for providing location information for emergency services calls, said method comprising:
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a client device logging into a voice-over-packet (VoP) access network via a physical link; dynamically assigning a network address to said client device; storing in a location database a correlation between said network address and a location associated with said physical link; an outbound proxy server receiving from said client device, via said VoP access network, a Session Initiation Protocol (SIP) INVITE message, said SIP INVITE message including said network address; said outbound proxy server determining that said SIP INVITE message is requesting an emergency services call and, responsively, accessing said location database to obtain said location based on said network address; and said outbound proxy server inserting said location into said SIP INVITE message as a network-provided location. - View Dependent Claims (15, 16, 17)
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18. A system for providing location information for emergency services calls, said system comprising:
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a voice-over-packet (VoP) access network to which a plurality of client devices are communicatively coupled; an outbound proxy server communicatively coupled to said VoP access network so as to receive call requests from said client devices, wherein in response to an emergency services call request from a given one of said client devices said outbound proxy server is configured to (i) obtain a network-provided location of said given client device, based on a source address of said emergency services call request or by invoking an active network location function of said VoP access network, and (ii) insert said network-provided location into said emergency services call request; and a routing server communicatively coupled to said outbound proxy server, wherein said routing server is configured to route said emergency services call request to an appropriate public safety answering point (PSAP), from among a plurality of PSAPs, based on an evaluation of said network-provided location and any client-provided location in said emergency services call request, wherein said evaluation involves determining whether said network-provided location and said any client-provided location are consistent. - View Dependent Claims (19)
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Specification