BroadSoft

Cbeyond and BroadSoft Take Leadership Role in SIP Trunking Market

A Dozen IP PBXs Deployed Through Innovative SIP Trunking Service Validates Market Demand

BOSTON - September 12, 2006 - Cbeyond^®, (NASDAQ: CBEY), a managed services provider to small businesses, and BroadSoft Inc., a leading provider of VoIP application software, today announced their leadership role in the Session Initiated Protocol (SIP) trunking market. Both companies stake their claim based on the success of a dozen IP PBX vendors that have successfully deployed solutions leveraging their innovative SIP Trunking Service, which further validates market demand.

Cbeyond and BroadSoft developed their SIP Trunking Service with the SIPconnect specification, which was pioneered 18 months ago by both organizations, along with a number of other leading IP telephony vendors. This specification fosters direct IP interoperability among businesses with IP PBXs and service providers by providing a consistent, industry standards-based approach to interconnection using SIP and other standard VoIP protocols.

"An industry standards-based approach to SIP trunking, such as SIPconnect, is an essential condition for widespread adoption by both IP-PBX vendors and service providers," said Marc Robins, chief evangelism officer at RCG and a leading IP communications industry authority. "Cbeyond, as the first VoIP service provider to embrace SIPconnect and one of the first to launch a successful SIP trunking service, and BroadSoft, with its development and support of the underlying technology, are true pioneers of this technology."

The SIPconnect specification, which is now a SIP Forum-proposed recommendation, includes detailed instructions and architecture specifications designed to ensure a consistent quality of service, low cost and full-featured telephony for SIP-based VoIP calls.

"Cbeyond's BeyondVoice with SIPconnect service, an integrated voice, broadband and mobile package, provides our small business customers with features typically available only to large enterprises," said Brooks Robinson, chief marketing officer for Cbeyond. "Directly peering with next generation IP PBXs via SIP, allows Cbeyond to take advantage of our strong relationships with the channel partner community, while leveraging the innovation of more than a dozen IP?PBX vendors."

Fully interoperable IP PBX vendors that have successfully deployed solutions leveraging SIPconnect include Allworx, Asterisk, Avaya, Cisco, Epygi, Fonality, Guardian Technologies, Linksys, Sphere Communications, Switchvox, TalkSwitch and TeleChoice Solutions.

"It's exciting to see such a widespread adoption of SIPconnect by IP PBX vendors," said Scott Wharton, vice president of marketing for BroadSoft. "We can power SIPconnect and help service providers like Cbeyond generate new streams of revenue."

About Cbeyond

Cbeyond (NASDAQ: CBEY) is an Atlanta-based managed services provider that delivers integrated packages of voice, mobile and broadband services to small businesses in Atlanta, Chicago, Dallas, Denver, Houston and Los Angeles. Cbeyond offers core communications services such as local and long-distance voice, mobile and broadband Internet access along with enhanced applications, including voicemail, email, Web hosting, fax-to-email, data backup, file-sharing, VPN and more. Cbeyond manages these services over a private, 100?percent Voice over Internet Protocol (VoIP) facilities-based network. For more information on Cbeyond, visit www.cbeyond.net

About BroadSoft

BroadSoft's VoIP application software is revolutionizing the delivery of hosted telephony and multimedia services. Its flagship BroadWorks technology empowers wireless, wireline and cable 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 provides VoIP applications to 6 of the top 10 and 11 of the top 25 largest carriers worldwide, including Korea Telecom, Singtel, Telefonica de Espana, Telstra, T-Systems, Verizon and XO Communications.

Forward-Looking Statements

This document contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements include, but are not limited to statements identified by words such as "believes," "expects," "anticipates," "estimates," "intends," "plans," "targets," "projects" and similar expressions. Such statements are based upon the current beliefs and expectations of Cbeyond's management and are subject to significant risks and uncertainties. Actual results may differ from those set forth in the forward-looking statements. Factors that might cause future results to differ include, but are not limited to, the following: adoption of SIPconnect by IP-PBX vendors and service providers, market acceptance of this service by our small business customers, changes in federal or state regulation that affects the Company; the timing of the initiation, progress or cancellation of significant contracts or arrangements; the mix and timing of services sold in a particular period; competitive factors; the need to balance the recruitment and retention of experienced management and personnel with the maintenance of high labor utilization; rapid technological change and the timing and amount of start-up costs incurred in connection with the introduction of new services or the entrance into new markets; the inability to attract sufficient customers in new markets; changes in estimates of taxable income or utilization of deferred tax assets which could significantly affect the Company's effective tax rate; and general economic and business conditions.

BroadSoft and BroadWorks are registered trademarks of BroadSoft, Inc. All other names are trademarks of their respective owners.

BroadSoft PR Contact:

Leslie Ferry
Vice President, Marketing
+1-240-364-9038
lferry@BroadSoft.com