Contact:

Laura Abbott, for XConnect

+1 203-869-8217

laura.abbott@comunicano.com

FOR IMMEDIATE RELEASE

NETNUMBER TITAN SERVER CERTIFIED XCONNECT-READY,

SIMPLIFYING VOIP FEDERATION-BASED INTERCONNECTION

Interoperability Testing Streamlines NetNumber TITAN Access

To XConnect Registry and Peering Federations Globally

LONDON – March 11, 2009 – XConnect, the leader in Voice over IP (VoIP) and Next Generation Network (NGN) peering, today announced that the NetNumber TITAN (Transactional IP Telephony Addressing and Numbering) server has been certified XConnect-Ready.â„¢

This interoperability certification assures service providers deploying the TITAN server that they can enable registry lookups and routing information with the XConnect ENUM registry. This allows calls between the service provider’s network and XConnect federation members to be routed over IP, bypassing the PSTN. With PSTN hops circumvented, call quality is preserved, termination costs are reduced, and advanced services such as high-definition voice and video can be carried across networks.

The NetNumber TITAN, a converged ENUM, SIP, SS7/C7 and SIGTRAN addressing and routing engine, received the XConnect Ready designation after completing interoperability testing based on SIP signalling and ENUM queries with XConnect federations.

“The TITAN server is the first addressing and routing engine that XConnect has certified,” said Eli Katz, XConnect CEO and founder, who added that the company previously has certified signalling platform elements, such as SIP proxies and session border controllers. “This new interoperability will enable service providers utilizing TITAN to efficiently access XConnect Registry information and interconnect to XConnect Federations by enabling cascading queries from TITAN to the XConnect Registry.”

Katz continued, “With NetNumber as our partner, we are pleased to be working toward the goal of universal routing of voice, video and converged applications between IP communication service providers, both fixed and mobile.”

The XConnect Ready Partners Program is designed to create an ecosystem of pre-tested vendors and solutions to facilitate peering.

“Fixed-line carriers and mobile operators that have deployed the NetNumber TITAN server can now query the XConnect registry via SIP and ENUM methodologies to identify routing details for millions of telephone numbers operated by service providers globally,” said Douglas Ranalli, NetNumber’s founder and chief strategy officer. “Future Carrier-ENUM and number-portability implementations will depend on the smooth integration of routing data from multiple registry providers, and this certification moves us in that direction.”

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About XConnect:

London-based XConnect offers a comprehensive suite of peering, interconnect and registry services to enable IP communication operators to connect and exchange voice and multimedia traffic within secure, ENUM-based peering federations. XConnect’s services enable telecom service providers to reduce interconnection costs, improve service quality, simplify operations, and offer rich multimedia IP communications on a cross-network basis. Backed by Tier 1 venture capital firms, including Accel Partners and Venrock Associates, XConnect was selected by the cable industry in the Netherlands to operate the first national VoIP peering solution. XConnect has lead industry consolidation via the acquisition of the European carrier ENUM exchange e164.info and US-based peering service IPeerX Inc. For more information, please visit http://www.xconnect.net/.

About NetNumber:

NetNumber provides market-leading converged, next-generation, ENUM, SIP, SS7/C7 and SIGTRAN addressing and routing technology to the global communications industry. The NetNumber TITAN server is licensed and deployed by many of the world’s largest mobile operators, fixed-line carriers, and cable companies as a centralized addressing and routing infrastructure for both TDM and IP-based voice services, messaging services, number-portability services and least-cost routing services. The highly-scalable TITAN Master/Edge architecture provides carriers/operators with a centralized infrastructure for managing addressing and routing data for use by multiple applications that may be widely distributed across a carrier’s global network. Additional information is available at http://www.netnumber.com/.

Service provides DCANet customers with access to affordable, high-speed Internet access

HERNDON, VA – March 11, 2009 – XO Communications (OTCBB: XOHO) today announced that it is providing DCANet, one of the oldest, continuously operating Internet service providers (ISPs) in the greater Philadelphia area, with Ethernet over Copper services. The deployment, launched this week, is an upgrade to the T-1 transport service provided to DCANet by XO since 2006 and will enable the company to offer customers access to high-speed, dedicated Internet access. By combining XO’s proven Ethernet capabilities with DCANet’s proactive monitoring and support, customers will have access to high-quality, high-capacity bandwidth while avoiding the costly and time-consuming process of laying fiber to connect their locations.

“The majority of our customers aren’t tied into fiber networks, so leveraging existing copper lines to deliver high-speed Internet access was a natural choice,” said Keith Duncan, Ph.D., president and CEO of DCANet. “XO had already proven its commitment to high-level service and offered the perfect option for Ethernet access, so our choice of where to turn was simple.”

Through the agreement, XO is providing DCANet with Ethernet access speeds starting at 5 Mbps, with the capability to increase to 20 Mbps – a significant jump for customers only able to access the limited 1.54 Mbps speed associated with the T-1 service. The end result will enable businesses to more quickly and effectively download and share data-intensive, latency-sensitive files across the Internet.

“Over the years, XO has taken care to ensure that the offerings we develop and package match the needs of our varied customer base,” said Don MacNeil, vice president of XO Carrier Services Sales Operations. “Our Ethernet over Copper products afford carriers a cost-effective, high-quality option for faster Internet connections for their customers. We’re pleased that DCANet has chosen us once again to be their network provider.”

XO Communications has become an industry leader in expanding the availability of Ethernet services to carriers through its utilization of Ethernet over Copper technology. The company recently expanded its Ethernet over Copper services footprint by 18 percent and now has deployments in 75 major metropolitan markets, enabling XO to utilize metro copper loops to serve non fiber-fed businesses with Ethernet services at speeds from 5 to 88 Mbps. For more information about XO’s Ethernet over Copper services, contact your Carrier Account Executive, visit www.xo.com/carrer or contact XO at 1+800.474.1763, 1+ 303.539.7738 or 1+ 972.578.6496.

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 DCANet

DCANet is a division of Consult Dynamics, Inc. (CDI), which was founded in 1990 as a wide-area networking consulting firm and computer reseller. DCANet has been providing quality Internet services since 1994, with offices in Philadelphia, Pa., and Wilmington, Del. With an emphasis on customer support, quality service and reliability, DCANet provides premium Internet, data and voice services at competitive prices throughout the Delaware Valley.

DCANet has built a fully redundant, private fiber-based regional network with upstream connectivity to multiple Tier-1 networks. DCANet maintains a 10GB DWDM SONET ring between its Philadelphia and Wilmington datacenters, providing the highest levels of network reliability. At its Wilmington datacenter, DCANet provides high density and high availability colocation facilities. For more information, visit www.dca.net.

Contact:

Cassidy Neveux

Reputation Partners (for XO Communications)

312-819-5720

cassidy@reputationpartners.com

FOR IMMEDIATE RELEASE

March 11, 2009

MEDIA CONTACT

Margaret Boles

202-296-6650

mboles@comptel.org

COMPTEL President Matthew Salmon Resigns

WASHINGTON, D.C. – COMPTEL announced today that Matthew Salmon has resigned as President of the association. He will join the lobby firm Policy Impact. COMPTEL CEO Jerry James will continue to provide leadership over COMPTEL’s public policy initiatives and will assume the day-to-day responsibilities.

Mr. James has served at the helm of COMPTEL since June 2007. He is a former president of Grande Communications and a past Chairman of COMPTEL. “It has been a pleasure working with Matt over the past year,” said Mr. James. “We appreciate his hard work and dedication and we wish him all the best in his future endeavors.”

“The association remains a strong and effective voice before lawmakers and regulators,” Mr. James continued. “We will continue to advocate for the needs of our members before Congress, the Federal Communications Commission and the Courts, as we have for the past 30 years.”

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About COMPTEL

Based in Washington, D.C., COMPTEL is the leading industry association representing competitive communications service providers and their supplier partners. COMPTEL members are entrepreneurial companies driving technological innovation and creating economic growth through competitive voice, video, and data offerings and the development and deployment of next-generation, IP-based networks and services. COMPTEL advances its members’ interests through trade shows, networking, education, and policy advocacy before Congress, the Federal Communications Commission and the courts. COMPTEL works to ensure that competitive communications providers can continue to offer lower prices, better service, and greater innovation to consumers. For more information, visit www.comptel.org.