U.S. Bureau of Indian Affairs Southwestern Bell Telephone Company AT&T Lockheed-Martin Space Operations Capco Communications, Inc. Data Information and Voice Associates Telecom. & Business Strategies Group, Ltd. Texas State Agencies: Department of Information Resources General Services Commission (Texas Building and Procurement Commission) Health & Human Services Commission Department of Public Safety Texas School Districts: Birdville Independent School District Frisco Independent School District Coppell Independent School District Jacksonville Independent School District Georgetown Independent School District Collin County Community College District City of Odessa, Texas City of North Richland Hills, Texas Williamson County, Texas