Press Release

XO Communications Selects BroadSoft's Leading VoIP Application Software to Power New Bundled IP Voice and Data Services

With BroadSoft, XO Reinforces its Commitment to Providing Businesses with the Latest in Innovative and Cost-Efficient Next-Generation Services.

GAITHERSBURG, MD, January 31, 2005 -- BroadSoft ®, the world's premier provider of VoIP application software, today announced that XO Communications, Inc. (OTCBB: XOCM.OB) will use BroadSoft's enhanced voice applications software to support XOptions® Flex - the new XO VoIP bundled service for businesses. XO is the nation's largest facilities-based provider of national local telecommunications services focused exclusively on businesses.

XOptions Flex will offer business customers a simple bundled VoIP services solution over single broadband connection to the XO IP Network that combines unlimited local and long distance calling, Dedicated Internet Access and web hosting for a single monthly price. By using BroadSoft's BroadWorks® platform, XOptions Flex will be able to offer a wide range of advanced features that enable businesses to:

• Increase efficiencies with dynamic bandwidth allocation;
• Save money with unlimited local and long distance calling;
• Improve productivity with a voice virtual private network (VPN) that offers site-to-site calling, private dial plans, and support for mobile workers;
• Improve customer service with a personalized and professional auto-attendant greeting that seamlessly connects callers to employees anywhere, on any phone;
• From easy-to-use web portals, empower employees to manage advanced features such as selective call forwarding, click-to-dial Microsoft Outlook contacts, and remote office calling.

"BroadSoft's BroadWorks platform is an integral part of our strategy to lead the industry with superior next generation bundled services for businesses nationwide," said Craig Collins, vice president of product management at XO Communications. "With BroadWorks, XO is able to leverage IP technology to provide our customers with the latest and richest set of advanced features that businesses need today to compete more effectively. BroadSoft's open architecture and scalability provides a platform that can grow to support millions of users and an evolving set of new applications."

"XO Communications has proven again and again its leadership in the competitive carrier industry by delivering communications solutions that improve businesses' productivity and bottom line," said Michael Tessler, CEO and president of BroadSoft. "We look forward to a long relationship with XO and expect they'll have great success as they launch XOptions Flex as the first in a line of new IP-enabled services."

ABOUT XO COMMUNIATIONS
XO Communications is a leading provider of national and local telecommunications services to businesses, large enterprises and telecommunications companies. 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, national facilities-based IP network and serves more than 70 metropolitan markets across the United States. For more information, visit www.xo.com .

ABOUT BROADSOFT
BroadSoft's VoIP application software is revolutionizing the delivery of hosted telephony and multimedia services. Its flagship BroadWorks® technology empowers wireless and wireline carriers to deliver next-generation voice and multimedia applications and advanced features that increase revenue, enhance competitive differentiation and elevate customer satisfaction. BroadSoft's family of carrier-class software products delivers the scale, open architecture and reliability that the world's leading telecommunications companies demand to serve mission-critical enterprise and residential broadband customers. BroadSoft's customer base of more than 90 network operators, including Alltel, Telstra, and XO Communications, leads the industry with more than 750,000 lines deployed. Additional information is available at www.broadsoft.com

BroadSoft and BroadWorks are registered trademarks of BroadSoft, Inc. XO and XOptions are registered trademarks of XO Communications, Inc. All other names are trademarks of their respective companies.

For further information contact:

Calysto Communications for BroadSoft
Cameron Smith
+1 (404) 266-2060 ext.19
csmith@calysto.com

BroadSoft
Hilary Tomasson
+1 (240) 364-5147
htomasson@broadsoft.com

# # #