Patent ID: 7398095
Filing Date: 2008-07-08
Classification: H04L,H04W

Abstract:
1. A method for initializing a push-to-talk call over a wireless communication network, comprising: receiving via a wireless communication network, a push-to-talk initialization request from a calling handset, the request identifying a recipient handset currently having no communicative links with the calling handset; establishing a communicative link between the calling handset and the recipient handset, including creating an announce message corresponding to the push-to-talk initialization request; addressing the announce message to the recipient handset; broadcasting the announce message over the wireless communication network, wherein the announce message is transmitted over a plurality of base stations the plurality of base stations covering a geographic region where the recipient handset is expected to be located; receiving via one of the plurality of base stations an acknowledgement message in response to the announce message; and transmitting a connection status message to the calling handset to instruct the calling handset to open an audio channel in response to receiving the acknowledgement message.