Patent ID: 7843903
Filing Date: 2010-11-30
Classification: H04L,H04M,H04W

Abstract:
1. A method for providing emergency 911 (E911) registration assistance for a portable Internet Protocol (IP) communications device, the method comprising: (a) storing, in a voice over IP (VoIP) application server, an IP address of a portable IP communications device; (b) receiving, at the VoIP application server, a registration message from a session border controller (SBC) indicating an IP address of the portable IP communications device, wherein the SBC generates the registration message in response to receiving a registration request message from the portable IP communications device; (c) determining, at the VoIP application server, whether a difference between the stored IP address and the received IP address indicated by the registration message indicates a change in geographic location of the portable IP communications device; and (d) in response to determining that the difference between the stored IP address and the IP address indicated by the received message indicates a change in geographic location of the portable IP communications device, prompting a subscriber to update stored geographic location information for providing E911 service to the subscriber.