Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-03-03
2010-06-22
Feild, Joseph H (Department: 2627)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S466000, C455S410000, C455S411000, C455S412100, C455S414100
Reexamination Certificate
active
07742768
ABSTRACT:
A soft switch134providing wireless PBX voice services to a local area network (WLAN) is used to extend PBX functionality to the cellular domain. A dual mode remote unit is capable of receiving signals both in the cellular system as well as the WLAN. The cellular system is comprised of a data-bearing path and a voice-bearing path. When the dual mode remote unit is within the WLAN, it communicates both voice over IP (VoIP) signaling as well as session initiation protocol (SIP) control signaling over the WLAN. When the remote unit is outside the WLAN, it communicates voice signaling over the voice-bearing path of the cellular network using a standard cellular voice channel. In parallel, it uses the data-bearing path of the cellular network to transmit SIP control signaling.
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Network Working Group
Devarasu Ragunath
Liu Kim Quo-Taht
Natarajan Shriram
Stensrud William R.
Feild Joseph H
Nguyen Huy D
Schwabe Williamson & Wyatt P.C.
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