Proxy modem for voice over internet protocol based...

Details Proxy modem for voice over internet protocol based... Proxy modem for voice over internet protocol based...

2007-10-02

2007-10-02

Ho, Duc (Department: 2616)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S401000, C375S222000

Reexamination Certificate

active

10244619

ABSTRACT:
In a packet data communications system (100) where a customer premises (120) has only a packet-based connection, a proxy modem (200) is provided at the customer premises to connect to devices that send and receive modulated transmissions, e.g., facsimile, modem, and TDD/TTY. The proxy modem demodulates the modulated transmissions (208), organizes the resulting digital signal into a packet (210) and forwards the packet over a packet network (104, 106). Another proxy modem (200) that connects to the packet network and to a telephony network (110) receives the packets from the packet network. The packets are re-organized into a digital signal that is then modulated and forwarded over the telephony network to a destination. Use of the proxy modems in the network prevents unnecessary digitizing of modulated transmissions, which slows transmission and introduces errors.

REFERENCES:
patent: 2002/0064137 (2002-05-01), Garakani et al.
patent: 2003/0123097 (2003-07-01), Fruth
patent: 2003/0123466 (2003-07-01), Somekh et al.
patent: 2006/0133358 (2006-06-01), Li et al.

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