Patent ID: 7738634

Claim:
A method for providing emergency location information to an emergency service provider, comprising: (a) providing an enterprise network comprising at least one communication device, an Open Systems Interconnect (OSI) switch and a corresponding enterprise switch, wherein the communication device is connected to an access point connected to the OSI switch, the enterprise network corresponding to a plurality of Emergency Location Information Numbers (ELINs) associated with differing segments of the enterprise network, and wherein the OSI switch serves at least one of the differing segments; (b) when a predetermined first event occurs, the communication device obtaining via the access point an access point identifier; (c) the communication device thereafter maintaining the access point identifier in memory; (d) when a call is initiated by the communication device to a universal emergency number, the communication device providing the access point identifier to the enterprise switch in a message transmitted via the access point; (e) the enterprise switch, maintaining a set of data structures mapping the access point identifier to an ELIN corresponding to a network segment comprising the corresponding communication device and, in response to step (d), using the set of data structures and access point identifier received from the communication device to select a first ELIN corresponding to a first network segment including the first communication device; and (f) the enterprise switch, forwarding, as part of the call, the first ELIN to a public safety answering point.