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How Internet protocol-enabled services are changing the face of communications: a view from technology companies: hearing before the Subcommittee on Telecommunications and the Internet of the Committee on Energy and Commerce, House of Representatives, One Hundred Ninth Congress, first session, February 9, 2005.
How Internet protocol-enabled services are changing the face of communications: a look at the voice marketplace: hearing before Subcommittee on Telecommunications and the Internet of the Committee on Energy and Commerce, House of Representatives, One Hundred Ninth Congress, first session, March 16, 2005.
How Internet protocol-enabled services are changing the face of communications : a view from government officials : hearing before the Subcommittee on Telecommunications and the Internet of the Committee on Energy and Commerce, House of Representatives, One Hundred Ninth Congress, first session, April 27, 2005.