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ATM-based distributed virtual tandem switching system

  • US 6,389,011 B2
  • Filed: 02/28/2001
  • Issued: 05/14/2002
  • Est. Priority Date: 04/30/1998
  • Status: Expired due to Fees
First Claim
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1. A method for establishing an Asynchronous Transfer Mode (ATM) connection from an originating end office to a destination end office across an ATM network via an originating trunk interworking function (T-IWF) device and a terminating T-IWF device, the method comprising:

  • transmitting an originating message, including a called telephone number, from the originating end office to a centralized control and signaling interworking function (CS-IWF) device;

    processing the originating message to identify the originating T-IWF device and to identify the terminating T-IWF device;

    forwarding a terminating message, including the called telephone number, from the CS-IWF device to the destination end office;

    initially reserving a first trunk between the originating end office and the originating T-IWF device, the first trunk having a first trunk ID, the originating message further comprising the first trunk ID;

    sending an ATM request via the ATM network to the terminating T-IWF device requesting a second trunk between the terminating T-IWF device and the destination end office, the second trunk having a second trunk ID;

    reserving the second trunk;

    forwarding a trunk ATM message via the ATM network from the terminating T-IWF device to the CS-IWF device, the trunk ATM message comprising the second trunk ID; and

    establishing an ATM connection between the originating T-IWF device and the terminating T-IWF device.

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