The Williams MediaXtranet is backed by the nation's largest fully-lit, next-generation fiber-optic network and powers their streaming offerings such as ActiveCast, a managed interactive webcasting service. Streamcheck's international network of measurement computers provides an early-warning system to the operations staff at Williams so that quality issues are immediately addressed. Williams is also using Streamcheck to provide Service Level Agreements (SLAs) to its customers.

"Streamcheck provides the ideal solution for our streaming QoS needs. The Williams network is designed to deliver streaming content with the high reliability that today's content owners demand. Streamcheck allows us to demonstrate this commitment to our customers and provide one of the most stringent SLAs in the industry." said Jill Harrington, Director of Customer Care for Williams.

Streamcheck has an international network of measurement computers ("Scanners") deployed throughout the US, Canada and Europe. Streamcheck Scanners mimic the experience of streaming end-users while gathering crucial metrics that allow content owners and service providers to monitor streaming quality. Since June 2000, Streamcheck has conducted more than five million checks on streaming content, ranging from Internet radio and financial news to live video events and on-demand entertainment content. It is this scope, reach and unique capacity to measure streaming performance that has attracted the industry’s most prominent content owners and service providers to Streamcheck's unique solution.

"We are thrilled to be working with a company as dedicated to reliability and quality as Williams Communications. Xtranet and ActiveCast customers are using one of the most advanced streaming networks currently in operation worldwide." said Shai Berger, president of Streamcheck.

About Williams Communications Group, Inc.
Based in Tulsa, Okla., Williams Communications Group, Inc., is a leading broadband network services provider focused on the needs of bandwidth-centric customers. Williams Communications operates the largest, most efficient, next-generation network in North America. Connecting 125 U.S. cities and reaching five continents, Williams Communications provides customers with unparalleled local-to-global connectivity. By leveraging its infrastructure, best-in-breed technology, connectivity and network and broadband media expertise, Williams Communications supports the bandwidth demands of leading communications companies around the globe. For more information, visit www.williamscommunications.com.

About Streamcheck
Streamcheck provides end-to-end measurement and monitoring solutions for streaming media, helping customers deliver their message with consistent quality and reliability. Streamcheck's family of services provides 24x7 monitoring, diagnostic tools and customizable reports. Streamcheck offers an objective way to demonstrate quality to customers, advertisers and partners. Streamcheck's distributed network of measurement devices ("Scanners") has performed more than 6 million individual checks on streams of all types and covers major cities in the US, Canada and Europe. To learn more, visit www.streamcheck.com.