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Apparatus and method for interconnecting ISDN/internetwork users

  • US 5,745,702 A
  • Filed: 08/22/1995
  • Issued: 04/28/1998
  • Est. Priority Date: 08/22/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for interconnecting a LAN (local area network) and remote stations through an integrated services digital network (ISDN), each of said LAN and remote stations being a user of an internetwork and being assigned a network address and a host address of the internetwork and a telephone number of the ISDN, the apparatus comprising:

  • a first port connected to the LAN and a second port connected to the ISDN, said first and second ports being respectively identified by a port number;

    a database having a plurality of entries associating network addresses with said port numbers and a plurality of entries associating host addresses with telephone numbers;

    a lookup table having a plurality of entries corresponding to said port numbers; and

    control means for (a) receiving a call indication signal through the second port and storing a source telephone number contained in the call indication signal into an entry of the lookup table corresponding to the port number of the second port, (b) receiving a packet from the LAN, detecting a port number in an entry of the database corresponding to a network address contained in the received packet, detecting a telephone number in an entry of the database corresponding to a host address contained in the packet and forwarding the received packet as a message packet to the port of the detected port number if the detected telephone number is stored in an entry of the lookup table corresponding to the detected port number, and storing the detected telephone number into an entry of the lookup table corresponding to the detected port number if the detected telephone number is not stored in said entry of the lookup table and forwarding the received packet as a call setup packet to the port of the detected port number.

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