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Method and apparatus for interfacing a public switched telephone network and an internet protocol network for multi-media communication
- August 28, 2018 AT&T Breaches VoIP Pioneer's Patents, Suit Claims
- August 11, 2009 Verizon's Bid To Dismiss VoIP Patent Suit Denied
- January 09, 2009 Charter Slaps Verizon With Patent Suit Over FiOS
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