Determining the geographical location from which an...

Details Determining the geographical location from which an... Determining the geographical location from which an...

2007-02-13

2007-02-13

Woo, Stella (Department: 2614)

Telephonic communications

Emergency or alarm communications

Central office responsive to emergency call or alarm

C370S352000

Reexamination Certificate

active

10861194

ABSTRACT:
In order that emergency service vehicles can be dispatched to the correct destination promptly, accurate information about the location of the caller is needed. Another problem concerns routing emergency calls to the correct destination. For emergency calls a universal code is used such as 911 in North America and 112 in Europe. This universal code cannot be used to identify the destination of the call. These problems are particularly acute for nomadic communications systems such as voice over internet protocol communications networks. That is because user terminals change network location. These problems are solved by enabling the geographical location of the emergency caller to be determined by entities within a packet-based network without the need for modification of existing emergency services network infrastructure.

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