iBasis CEO to Present at Needham Investor Conference.

Gneezy will Discuss Company's Historic Revenue Growth, Pending Merger of KPN Global Carrier Services into iBasis, and Future Market Opportunities

BURLINGTON, Mass. -- iBasis, Inc. (NASDAQ: IBAS), the global VoIP company[TM], today announced that company President and CEO Ofer Gneezy will present at the Ninth Annual Needham Growth Stock Conference that is being held at The New York Palace Hotel on January 9-12, 2007. Mr. Gneezy will present on Tuesday, January 9 at 5:00 p.m. EDT. A webcast of the presentation will be accessible live and archived from the iBasis investor relations site at investor.ibasis.com.

Mr. Gneezy will discuss the company's continued revenue growth, the logic of the company's agreement with Royal KPN to merge the Dutch national carrier's international voice business into iBasis, and the industry trends in international voice communications that he believes represent significant growth opportunities for the company.

About the Conference

The Ninth Annual Needham Growth Stock Conference will be held January 9 - 12 at the New York Palace Hotel, 455 Madison Avenue, New York. For more information visit the Needham web site at www.needhamco.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, including the Pingo[R] web-based offering (www.pingo.com) and disposable calling cards that are sold through major distributors and available at retail stores throughout the U.S. iBasis customers include many of the largest telecommunications carriers, including AT&T, Verizon, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica. iBasis carried 7.8 billion minutes of international voice over IP (VoIP) traffic in 2005, and is one of the largest carriers of international voice traffic in the world1. The Company can be reached at its worldwide headquarters in Burlington, Massachusetts, USA at 781-505-7500 or on the Internet at www.ibasis.com.

iBasis and Pingo are registered marks, The iBasis Network and the global VoIP company are a trademarks of iBasis, Inc. All other trademarks are the property of their respective owners.

Safe Harbor Statement

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. Statements regarding the proposed transaction between the Company and Royal KPN, including the expected timetable for completing the transaction, the expected dividend payment, future financial and operating results, benefits and synergies of the transaction, future opportunities for the combined company and products and any other statements regarding the parties' future expectations, beliefs, goals or prospects, also constitute forward-looking statements. Important factors that could cause actual results to differ materially from such forward-looking statements include, but are not limited to, (i) the Company's ability to execute its business plan; (ii) the extent of adoption of the Company's services and the timing and amount of revenue and gross profit generated by these services; (iii) fluctuations in the market for and pricing of these services; (iv) the success of the Company's plans to contest the FCC ruling on prepaid calling cards; (v) the ability of the Company and Royal KPN to consummate the proposed transaction due to regulatory restrictions, the failure to receive shareholder approval, the ability to successfully integrate their operations and employees, the ability to realize anticipated synergies, the emergence of new competitive initiatives resulting from rapid technological advances or changes in pricing in the market, business conditions and volatility and uncertainty in the markets that the Company and Royal KPN serve, (vi) the Company's inability to meet the requirements of the NASDAQ Stock Market for continued listing of the Company's shares; and (vii) the other factors described in the Company's Quarterly Report on Form 10-Q for its most recently completed fiscal quarter and Annual Report on Form 10-K for its most recently completed fiscal year and Royal KPN's Annual Report on Form 20-F for its most recently completed fiscal year 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.

This communication may be deemed to be solicitation material in respect of the proposed transaction between iBasis and Royal KPN. In connection with the proposed transaction, iBasis intends to file relevant materials with the SEC, including a proxy statement on Schedule 14A. SHAREHOLDERS OF IBASIS ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING IBASIS'S PROXY STATEMENT, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED TRANSACTION. Investors and security holders will be able to obtain the documents free of charge at the SEC's web site, http://www.sec.gov, and iBasis's shareholders will receive information at an appropriate time on how to obtain transaction-related documents for free from iBasis. Such documents are not currently available.

Participants in Solicitation

PRoyal KPN and its directors and executive officers, and iBasis and its directors and executive officers, may be deemed to be participants in the solicitation of proxies from the holders of iBasis Common Stock in respect of the proposed transaction. Information about the directors and executive officers of Royal KPN is set forth in the Annual Report on Form 20-F for the year ended 2005, which was filed with the SEC on March 14, 2006. Information about the directors and executive officers of iBasis is set forth in iBasis' proxy statement for its 2006 Annual Meeting of Shareholders, which was filed with the SEC on March 23, 2006. Investors may obtain additional information regarding the interest of such participants by reading the proxy statement regarding the transaction when it becomes available.

1 Telegeography 2006 data compared with iBasis 2005 traffic volume.