Method for handoff of a telephone call between two different wireless networks
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United States of America Patent
Stats
-
Jan 13, 2009
Grant Date -
Nov 25, 2004
app pub date -
Feb 17, 2004
filing date -
May 22, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and method with which to establish parallel communications between the wireless terminal and the PSTN via a WLAN and an alternative network such as cellular or satellite networks. Once the parallel communications are established, handoff criteria govern seamlessly switching communications between the WLAN and the alternative network in order to avoid any lost or dropped communications. Communications may be serviced between a Private Branch Exchange (PBX) and a wireless terminal. The PBX communicatively couples to a wireless local area network (WLAN). Calls received at the PBX for the wireless terminal are routed to the wireless terminal if the wireless terminal is serviced by the WLAN, otherwise an attempt is made to deliver the call via an alternative network. Should both deliveries fail, the call is delivered to an alternative destination such as voice mail or an operator.
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