CENTENNIAL OF PUERTO RICO CHOOSES BROADSOFT AND ATREUS
TO DELIVER MOBILE VOIP SERVICES

Service targets SMBs and large enterprises with BroadWorks Mobile PBX, advanced IP features including Remote Office and Sim Ring

PHOENIX, AZ, BROADSOFT CONNECTIONS 2006, October 17, 2006 - BroadSoft, Inc., a leading provider of VoIP application software, and Atreus Systems™, the leading supplier of IP provisioning software, today announced at the BroadSoft Connections 2006 Executive Users Conference that Centennial Communications Corp. (NASDAQ: CYCL), a provider of wireless and wired communications and business solutions in Puerto Rico, the Dominican Republic, the U.S. Virgin Islands and the United States, has chosen BroadSoft's BroadWorks® VoIP application platform to offer Mobile PBX telephony services. Centennial has completed BroadSoft's QuickStart Express program with VoIP provisioning partner Atreus Systems Inc., in preparation of launching Mobile PBX services.

Centennial is the first carrier in North America to offer BroadSoft's Mobile PBX application, an advanced, differentiated solution to IP PBXs and mobile IN solutions. BroadWorks Mobile PBX delivers the same feature-rich enterprise functionality to mobile devices that is available with hosted PBX. BroadWorks features available through Centennial's Mobile PBX offering will include remote office, selective call acceptance, call notify, auto attendant and simultaneous ring-where any call to an office number will automatically ring any other number specified by the end-user.

Centennial expedited its go-to-market strategy by going through the QuickStart Express program with BroadSoft and VoIP provisioning partner Atreus Systems.

"Fast-growing SMBs and enterprises in Puerto Rico conduct business across the Caribbean and in mainland U.S. states, such as Florida and New York, and require telephony services with a high degree of flexibility, scalability and mobility," said Carlos Blanco, president of Centennial de Puerto Rico. "BroadWorks Mobile PBX will give these companies and entrepreneurs the telecommunications capabilities they need to operate anywhere, at any time, on any device. BroadSoft and Atreus complemented our product deployment efforts very well, culminating in a highly successful launch."

Built on best practices, BroadSoft's QuickStart Express defines a planning, sales and deployment model and provides supporting go-to-market framework, toolkits and collateral for telecom service providers. Atreus Systems extends the BroadSoft QuickStart Express program with automated provisioning and customer self-management software for BroadWorks that enables Centennial to automate the provisioning of BroadSoft's Mobile PBX features, while streamlining service ordering, simplifying VoIP bundle package creation, and automating IP phone ordering, shipment and configuration.

"Our pre-packaged provisioning support for BroadSoft's QuickStart Express program will empower Centennial to become operational quickly by simplifying the complex processes in deploying the Mobile PBX application," said Andrea Baptiste, CEO of Atreus Systems.

"Centennial is leveraging its strong market position with enterprises by offering VoIP through our Mobile PBX solution," said Michael Tessler, president and CEO of BroadSoft. "This agreement also shows that Centennial is willing to lead the way in providing advanced telecommunications technology among carriers in North America and the Caribbean."

About the BroadWorks Platform
BroadSoft's IMS-compliant BroadWorks® platform provides a comprehensive range of VoIP applications, including hosted PBX, IP Centrex, mobile PBX, business trunking and residential broadband services fully integrated into a single VoIP application platform. BroadWorks provides these applications with the reliability, redundancy, scalability and regulatory capabilities required to deliver carrier-class service.

About Centennial
Centennial Communications (NASDAQ: CYCL), based in Wall, NJ, is a leading provider of regional wireless and integrated communications services in the United States and the Caribbean with approximately 1.4 million wireless subscribers and 337,700 access lines and equivalents. The U.S. business owns and operates wireless networks in the Midwest and Southeast covering parts of six states. Centennial's Caribbean business owns and operates wireless networks in Puerto Rico, the Dominican Republic and the U.S. Virgin Islands and provides facilities-based integrated voice, data and Internet solutions. Welsh, Carson, Anderson & Stowe and an affiliate of the Blackstone Group are controlling shareholders of Centennial. For more information regarding Centennial, please visit our websites www.centennialwireless.com, www.centennialpr.com and www.centennialrd.com.

About Atreus Systems
Atreus Systems™ is the leading supplier of provisioning software for VoIP, IMS and advanced IP service bundles. Atreus is the vendor of choice for the delivery of advanced IP services by leading providers, including Qwest, Lucent, Telus, Cincinnati Bell, Spirit Telecom, Aliant, Voila IP and Xspedius. Atreus has formed strategic partnerships with BroadSoft, Ericsson, Level 3 and Sonus, delivering carrier-class service provisioning and customer self-management for VoIP, IMS and advanced IP bundles. For more information, visit www.atreus-systems.com.

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 12 of the top 25 largest carriers worldwide, including Korea Telecom, Singtel, Sprint, Telefonica de Espana, Telstra, T-Systems, and Verizon.

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

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