Invention Grant
- Patent Title: Extension of a local area phone system to a wide area network
- Patent Title (中): 将局域电话系统扩展到广域网
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Application No.: US10317035Application Date: 2002-12-09
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Publication No.: US07826868B2Publication Date: 2010-11-02
- Inventor: Barry R. Robbins , William R. Stensrud , Katherine White Umpleby
- Applicant: Barry R. Robbins , William R. Stensrud , Katherine White Umpleby
- Agency: Schwabe, Williamson & Wyatt, P.C.
- Main IPC: H04B1/38
- IPC: H04B1/38
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.
Public/Granted literature
- US20040072593A1 Extension of a local area phone system to a wide area network Public/Granted day:2004-04-15
Information query
