JACQUES ADOLPHE ROTH
Pilots at Sandstone Ct, San Rafael, CA

5940479, Aug 17, 1999

Oct 1, 1996

8/724655

Kenneth R. Guy - Thousand Oaks CA
Jaswant R. Jain - Chatsworth CA
Ishwar V. Jasuja - Simi Valley CA
Michael W. Johnson - Petaluma CA
Albert Juandy - Greenbrae CA
Simon S. Lam - Agoura Hills CA
Anthony Y. Lee - Northridge CA
David Misunas - Thousand Oaks CA
Jacques A. Roth - San Rafael CA

Northern Telecom Limited - Montreal

H04M 1100, H04L 1228, H04J 312, H03M 1300

379 9301

A system and method for transmitting aural signals across a wide area network (WAN) from a local phone coupled to a computer, e. g. , a PC-phone, to a remote phone coupled to a KTS, PBX, or PSTN, for example. This capability is provided by the gateway unit of the present invention. The system of the present invention is quickly installed in a server or a personal computer coupled to a local area network. The system is connected to one or more of a PSTN, a private branch exchange, a key telephone system, a telephone, a facsimile machine, and a modem. In the case of voice transmission, a gateway unit translates received telephony signal into a format that is compatible with the telephone system or equipment connected thereto. The present invention can provide a voice quality that approaches, equals, or exceeds the voice quality of conventional telephone switched networks. This high voice quality is achieved by utilizing a high quality voice digitization algorithm on both the PC-phone and the gateway, by ensuring a low maximum network delay between the PC-phone and the gateway, by permitting a dynamic compensation for variations in network delay, and by utilizing a forward error correction technique for transmission over WANs that can recreate lost or delayed signals in a manner that recreates the signal so the lost signal is typically not detectable by a user.

6298057, Oct 2, 2001

Apr 19, 1996

8/634927

Kenneth R. Guy - Thousand Oaks CA
Jaswant R. Jain - Chatsworth CA
Ishwar V. Jasuja - Simi Valley CA
Michael W. Johnson - Petaluma CA
Albert Juandy - Petaluma CA
Simon S. Lam - Agoura Hills CA
Anthony Y. Lee - Northridge CA
David Misunas - Thousand Oaks CA
Jacques A. Roth - San Rafael CA

Nortel Networks Limited - St. Laurent

H04L 1228, H04J 316, G06F 1100

370389

A system and method for transparently transmitting aural signals across a wide area network (WAN). The system of present invention is connected to one or more of a private branch exchange, a key telephone system, a telephone, a facsimile machine, and a modem, for example. In the case of voice transmission, a user places a telephone call using the same procedure that is used when placing a telephone call over a conventional public switched network. The aural signals are translated into a format that is compatible with the local area network (LAN) and the translated signals are transmitted to a router or a switch that connects the LAN to the WAN. The data is transmitted across the WAN to a router or switch coupled to a second LAN. The data is then sent to a destination central site unit or PC which translates the signal into a format that is compatible with the telephone system connected thereto. The present invention provides a voice quality that approaches, equals, or exceeds the voice quality of conventional telephone switched networks.