Patent ID: 8391828

Claim:
A method for interworking with an external network in a wireless local access network, the method comprising: transmitting, by a requesting station, a generic advertisement service (GAS) initial request frame to a responding station, the GAS initial request frame including: a category field set to a value indicating a public action frame; an action field set to a value indicating the GAS initial request frame; an advertisement protocol element indicating a query to the responding station to retrieve information from an advertisement server of the external network; and a query request element indicating a query for emergency call number information; and receiving, by the requesting station, a GAS initial response frame from the responding station, the GAS initial response frame including: a category field set to a value indicating a public action frame; an action field set to a value indicating the GAS initial response frame; and a query response element including a list of emergency call numbers retrieved from the advertisement server.