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

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

2011-08-23

2011-08-23

Moe, Aung S (Department: 2474)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S310200, C370S328000, C370S401000, C370S493000, C455S428000, C455S466000, C455S560000

Reexamination Certificate

active

08005070

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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