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iBasis Named VoIP Leader by FierceVoIP

Newsletter Distributed by FierceMarkets Puts iBasis on List of Top Ten Cutting-Edge VoIP Companies

BURLINGTON, Mass. - December 26, 2007 - iBasis (NASDAQ: IBAS), the global VoIP company, today announced that it has been named a VoIP Leader by FierceVoIP, an honor that recognizes the top 10 companies on the cutting-edge of the constantly evolving VoIP industry. Winners are singled out for leading the industry as it explodes beyond service providers and into the fields of enterprise and unified communications.

FierceVoIP is a bi-weekly email newsletter distributed by FierceMarkets that covers news and insights on the emerging VoIP industry, providing more than 35,000 subscribers a quick, authoritative briefing on the week's top VoIP stories marketplace developments.

"iBasis is very well positioned to manage the traffic for the multitude of providers expected to blossom as voice applications are embedded everywhere," said FierceVoIP editor, Tom Burton.

In October 2007 iBasis completed a transaction to acquire KPN Global Carrier Services, the international wholesale voice business of Royal KPN N.V., the national carrier of the Netherlands. The combination makes iBasis one of the three largest carriers of international voice traffic in the world1 and the first IP-based carrier to break into Telecom's Top Three.

"We are honored to be named a VoIP Leader by FierceVoIP, which is a VoIP industry frontrunner in its own right," said Ofer Gneezy, president and CEO of iBasis. "Our success in leveraging the efficiencies of IP for voice transport has played an important role in positioning iBasis as a powerful platform for the outsourcing of international voice traffic, which we believe will be the next big wave in international telecommunications."

The FierceVoIP "Emerging VoIP Leaders" list celebrates the spirit of being "fierce" -- championing innovation and creativity, even in the face of intense competition. The complete list of exceptional companies is available today in a special Web-only issue of FierceVoIP at http://www.fiercevoip.com/story/voip-leaders-2007/2007-12-10.

About FierceVoIP

FierceVoIP is the voice over IP industry's leading source of insider information and updated news. FierceVoIP provides more than 35,000 insiders with a twice-weekly briefing on the sector's top news, trends, and gossip. Thousands more regularly visit the FierceVoIP Web site for the industry's latest breaking news. Sign up is free at www.fiercevoip.com.

About FierceMarkets

FierceMarkets, a leader in B2B e-media, provides information and marketing services in the Telecommunications, Life Sciences, Healthcare, IT, and Finance industries through its portfolio of email newsletters, Web sites, Webinars, and live events. Every business day, FierceMarkets publications reach more than 500,000 executives in over 100 countries. Current publications include DailyTechRag (http://www.dailytechrag.com), FierceBiotech (http://www.fiercebiotech.com), FierceBioResearcher (http://www.fiercebioresearcher.com), FierceBroadbandWireless (http://www.fiercebroadbandwireless.com), FierceCIO (http://www.fiercecio.com), FierceDeveloper (http://www.fiercedeveloper.com), FierceFinance (http://www.fiercefinance.com), FierceHealthcare (http://www.fiercehealthcare.com), FierceHealthIT (http://www.fiercehealthit.com), FierceIPTV (http://www.fierceiptv.com), FierceMobileContent (http://www.fiercemobilecontent.com), FiercePharma (http://www.fiercepharma.com), FierceSarbox (http://www.fiercesarbox.com), FierceTelecom (http://www.fiercetelecom.com), FierceVoIP (http://www.fiercevoip.com), IT-Wireless (http://www.it-wireless.com), and The Business VoIP Report (http://www.businessvoipreport.com).

About iBasis

Founded in 1996, iBasis (NASDAQ: IBAS) is a leading wholesale carrier of international long distance telephone calls and a provider of retail prepaid calling services and enhanced services for mobile operators. iBasis customers include KPN, KPN Mobile, E-plus, BASE, and many other large telecommunications carriers such as AT&T, Verizon, Vodafone, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, Telefonica, and Yahoo. In October 2007, iBasis acquired KPN Global Carrier Services to create one of the three largest carriers of international voice traffic in the world, and KPN became a majority stockholder of iBasis. On a pro forma basis, the combined company carried more than 20 billion minutes of international voice over IP (VoIP) traffic in 2006. The Company can be reached at its worldwide headquarters in Burlington, Mass., USA at +1 781-505-7500 or on the Internet at www.ibasis.com.



Except for historical information, all of the expectations, plans and assumptions contained in the foregoing press release constitute forward-looking statements under Section 21E of the Securities Exchange Act of 1934 and involve risks and uncertainties that could cause results to vary materially. For a description of certain of these risks and uncertainties please read the Company's most recent Annual Report on Form 10-K and other periodic and current reports, all of which are available at www.sec.gov. Such forward-looking statements are only as of the date they are made, and we have no current intention to update any forward-looking statements.