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Multimedia communication management system with line status notification for key switch emulation

  • US 7,304,985 B2
  • Filed: 07/22/2003
  • Issued: 12/04/2007
  • Est. Priority Date: 09/24/2001
  • Status: Expired due to Fees
First Claim
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1. A communication management system for operation with a packet switched local area network, the communication management system comprising;

  • a PSTN interface for communicating over a telephone line with a service provider central office;

    a network interface for communicating over the packet switched local area network with at least one real time communication device;

    a PSTN gateway comprising;

    means for establishing a logical channel over the packet switched local area network with a real time communication device in response to receiving session signaling that identifies a local area network address associated with the real time communication device, on a logical port associated with the telephone line;

    means for controlling the PSTN interface to transition the telephone line to an off hook state in response to receiving session signaling on a logical port associated with the telephone line;

    translation means for;

    providing digital audio over the logical channel, the digital audio representing a dial tone received on the telephone line from the central office; and

    providing one of a plurality of dual tone multi freguency signal on the telephone line in response to receipt of data from the real time communication device corresponding to the one of a plurality of dual tone multi freguency signals;

    means for receiving a session signaling message from the real time communication device that includes an identifier associated with the telephone line;

    means for determining a logical port associated with the telephone line;

    means for adding the logical port to a destination address of the session signaling message to generate a translated session signaling message; and

    means providing the session signaling message to the PSTN gateway on the logical port.

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