Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2011-07-26
2011-07-26
Ly, Nghi H (Department: 2617)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S261000, C370S352000, C370S466000, C455S416000, C455S554100, C455S555000
Reexamination Certificate
active
07986665
ABSTRACT:
A mobile communication device operating in a wireless local area network (WLAN) of a communication network maintains an inter-enterprise voice call via its WLAN interface (e.g. 802.11/VoIP/SIP) with another communication device in the communication network. During the voice call, a handover of the voice call from the WLAN to a wireless wide area network (WWAN) (e.g. GSM/GPRS) is identified. In response to identifying a handover indication, the mobile device causes a request message (e.g. a SIP INVITE message) to be sent over the WWAN to the conferencing gateway for establishing a first connection leg through the WWAN via its WWAN interface with a conference room of the conferencing gateway. The mobile device also causes a re-routing message (e.g. a SIP REFER message) to be sent to the communication device, so that a second connection leg between the communication device and the conference room may be established.
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Kezys Vytautas Robertas
Smadi Mohammed
Todd Terence D.
Zhao Dongmei
Ly Nghi H
Oskorep, Esq. John J.
Research In Motion Limited
Sternbane Larry
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