Williams Communications Solutions, LLC is a North American, single-source provider of business communications equipment and multimedia integration services for data, voice, video and advanced applications. About Williams Communications Group, Inc. Ltd. SunTech is a Texas based private company with offices in Tulsa, Okla., and Waco, Texas. SunTech provides third-party call center services, such as customer care, order center and technical support. SunTech has approximately 1,200 employees in its Tulsa office and 550 in its Waco offices.
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