XO Communications, a subsidiary of XO Holdings, Inc. (OTCBB: XOHO.OB), holds a long-standing partnership with deltathree. XO Communications is a leading provider of national and local telecommunications services to businesses, large enterprises and communications service providers. Through XO’s nationwide facilities-based IP network serving 75 metropolitan markets across the United States, deltathree is able to provide superior quality termination for its consumer and service provider clients.