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    • 1. 发明授权
    • Proxy modem for voice over internet protocol based communication system
    • 用于基于互联网协议的通信系统的代理调制解调器
    • US07277422B2
    • 2007-10-02
    • US10244619
    • 2002-09-16
    • Kevin L. BostromDavid G. TerebessyJudd O. WilcoxGeorge Paul Wilkin
    • Kevin L. BostromDavid G. TerebessyJudd O. WilcoxGeorge Paul Wilkin
    • H04L12/66
    • H04L12/2874H04L12/2856H04L12/66
    • 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.
    • 在客户驻地(120)仅具有基于分组的连接的分组数据通信系统(100)中,在客户驻地提供代理调制解调器(200)以连接到发送和接收调制的传输的设备,例如传真 ,调制解调器和TDD / TTY。 代理调制解调器解调调制的传输(208),将得到的数字信号组织成分组(210),并通过分组网络(104,106)转发分组。 连接到分组网络和电话网络(110)的另一个代理调制解调器(200)从分组网络接收分组。 分组重新组织成数字信号,然后通过电话网络将其调制和转发到目的地。 在网络中使用代理调制解调器可防止调制传输的不必要数字化,这减慢了传输速度并引入了错误。