Toshiba America Information Systems, Inc. Telecommunication Systems Division

IRVINE, Calif. and Herndon, Va., September 9, 2009 — Toshiba America Information Systems Inc., Telecommunication Systems Division (Toshiba — www.telecom.toshiba.com) and XO Communications (OTCBB: XOHO) today announced the certification of interoperability of XO SIP, the award-winning Session Initiation Protocol trunking solution from XO Communications, with Toshiba’s family of Strata® CIX™ IP business communication systems. XO SIP is now available from Authorized Toshiba Dealers nationwide.

“The XO SIP solution delivers low-cost SIP ‘trunks’ to users of Toshiba Strata CIX VoIP business communication systems, giving them the best of Toshiba’s enterprise telephony capabilities without the need to rely on traditional land lines,” said Shahin Hatamian, vice president of Product Management for Toshiba America Information Systems, Telecommunication Systems Division.

“With this agreement, Authorized Toshiba Dealers can now offer their Toshiba Strata CIX customers a cost-effective, easy-to-deploy and easy-to-manage SIP solution as part of their overall enterprise telephony system,” said Eric Hyman, director of managed services for XO Communications.

“This certification confirms that Toshiba’s Strata CIX VoIP systems and XO SIP work seamlessly together, providing enterprises with the confidence of reliable telephone service and equipment,” added Eric Abing, product manager, Toshiba America Information Systems, Telecommunication Systems Division.

About XO SIP
XO SIP is a fully integrated solution designed to support the needs of businesses with the most demanding voice and data applications at single or multiple locations. XO SIP uses Session Initiation Protocol signaling and a native IP-based facility to manage all traffic between a customer’s IP-PBX system, the XO IP network, and the Public Switched Telephone Network. The service provides greater efficiencies by eliminating the need for businesses to maintain multiple access facilities for voice and data services and eliminating the need for bandwidth-consuming protocol conversions.

1. XO SIP includes a broad range of bandwidth options to maintain optimal network performance and has the following features:
2. Dedicated Internet access with dynamic bandwidth allocation
3. Unlimited local calling
4. Unlimited site-to-site calling for multi-location customers with IP Flex, IP Flex with VPN and XO SIP locations
5. Long distance calling with choice of calling plans
6. Optional Voice Compression
7. Online Feature Management through the XO Business Center

About XO Communications
XO Communications, a subsidiary of XO Holdings, Inc. (OTCBB: XOHO), is a leading nationwide provider of advanced communications services and solutions for businesses, enterprises, government, carriers and service providers. Its customers include more than half of the Fortune 500, in addition to leading cable companies, carriers, content providers and mobile network operators. Utilizing its unique combination of high-capacity nationwide and metro networks and broadband wireless capabilities, XO offers customers a broad range of managed voice, data and IP services with proven performance, scalability and value in more than 75 metropolitan markets across the United States.

For more information, visit www.xo.com.

About Toshiba America Information Systems Inc. (TAIS)
Headquartered in Irvine, Calif., TAIS is comprised of four business units: Digital Products Division, Imaging Systems Division, Storage Device Division, and Telecommunication Systems Division. Together, these divisions provide mobile products and solutions, including industry leading portable computers; projectors; imaging products for the security, medical and manufacturing markets; storage products for automotive, computer and consumer electronics applications; and telephony equipment and associated applications.

TAIS provides sales, marketing and services for its wide range of information products in the United States and Latin America. TAIS is an independent operating company owned by Toshiba America, Inc., a subsidiary of Toshiba Corporation. Toshiba Corporation is a world leader and innovator in high technology, a diversified manufacturer and marketer of advanced electronic and electrical products. These products span from information & communications systems; digital consumer products; electronic devices and components; as well as power systems including nuclear energy; industrial and social infrastructure systems; and home appliances. Toshiba was founded in 1875, and today operates a global network of more than 730 companies, with 199,000 employees worldwide and annual sales surpassing US $67 billion (FY 2008).

For more information on Toshiba’s leading innovations, visit the company’s Web site at www.toshiba.com.

###

© 2009 Toshiba America Information Systems, Inc. All product, service and company names are trademarks, registered trademarks or service marks of their respective owners. Information including, without limitation, product prices, specifications, availability, content of services, and contact information is subject to change without notice.