Extension of a local area phone system to a wide area network

Details Extension of a local area phone system to a wide area network Extension of a local area phone system to a wide area network

2002-12-09

2010-11-02

Feild, Joseph H (Department: 2627)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S554100, C455S555000, C455S426100, C455S428000

Reexamination Certificate

active

07826868

ABSTRACT:
A soft switch providing 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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