Secure ATM-based distributed virtual tandem switching system and method
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United States of America Patent
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Nov 30, 2010
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app pub date -
Sep 14, 2006
filing date -
Apr 30, 1998
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Abstract
Narrowband signaling from a transfer node for a call originating at an end office is received at a centralized control and signaling interworking function device in an asynchronous transfer mode switching network. The received narrowband signaling is converted to broadband signaling. The broadband signaling is provided to a plurality of trunk interworking function devices via the asynchronous transfer mode switching network, to establish a connection across the asynchronous transfer mode switching network, when the centralized control and signaling interworking function device and the plurality of trunk interworking function devices are determined to be members of a closed user group.
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