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Operating a network node
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Patent number 9,800,957
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Issue date Oct 24, 2017
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METASWITCH NETWORKS LTD
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Jon Rowland
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Virtual telephone
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Patent number 6,956,936
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Issue date Oct 18, 2005
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Intel Corporation
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Robert Fritzinger
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Virtual PBX
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Patent number 6,587,555
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Issue date Jul 1, 2003
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Z-Tel Technologies, Inc.
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Daniel E. Cripe
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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