XO Communications Tops 3.8 Billion Minutes of VoIP Traffic in Second Quarter of 2006

RESTON, Va., July 17 /PRNewswire/ -- XO Communications today announced that it carried 3.89 billion minutes of Voice over Internet Protocol (VoIP) traffic across its private nationwide IP network in the second quarter of 2006, a 34 percent increase over the previous quarter and a 140 percent increase over the second quarter of 2005. The increase was driven by greater deployment of XO VoIP solutions by businesses and service providers, demonstrating the increasing demand for delivering voice services over an all IP network environment.

"Demand for our Voice over IP services continues to grow as businesses and service provider customers accelerate their migration of voice traffic to services based on IP," said Carl Grivner, CEO of XO Communications. "Our private IP network and robust Voice over IP platform provides customers with the broad nationwide coverage and performance to meet their requirements today and in the future."

XO offers a full suite of commercial and wholesale VoIP solutions delivered over an advanced softswitch and private IP network platform powered by Sonus Networks and Juniper Networks. This platform delivers both traditional circuit-switched voice traffic and packet-based VoIP traffic, allowing XO to support customers that continue to rely on time division multiplexing (TDM) technology and those that have migrated to more advanced, IP-based voice technology. By managing the VoIP platform over its own private IP network, XO helps customers avoid the congestion and delays of the public Internet while ensuring that customers' voice traffic is delivered with the same quality and reliability of traditional telephone networks.

For carriers and service providers, XO offers a complete suite of wholesale services, including VoIP origination, VoIP termination, IP transit, wholesale local voice, long distance termination and multi-market local inbound calling services. For business customers of all sizes, XO offers a wide range of voice services including local voice, dedicated and switched long distance, interactive voice response, and its award-winning VoIP services bundle, XOptions Flex. Since its introduction in April 2005, nearly 5,000 businesses have seamlessly moved into the IP world by taking advantage of XOptions Flex's fixed flat rate pricing and high performance service capabilities.

For more information about XO's services for businesses, carriers and service providers, contact an XO sales representative by calling (866) 963-9696 or visit http://www.xo.com/.

About XO Communications

XO Communications, a subsidiary of XO Holdings, Inc. (OTC: XOHO) (BULLETIN BOARD: XOHO) , is a leading provider of national and local telecommunications services to businesses, large enterprises and communications service providers. XO offers a complete portfolio of services, including local and long distance voice, dedicated Internet access, private networking, data transport, and Web hosting services as well as bundled voice and Internet solutions. XO provides these services over an advanced, nationwide facilities-based IP network and serves 75 metropolitan markets across the United States. For more information, visit http://www.xo.com/.