KPN Names Willem Offerhaus CEO of iBasis and Promotes John van Vianen to Managing Director, KPN Business Market

BURLINGTON, Mass. – 12/01/2010 – iBasis, a KPN company, today announced the appointment of Willem Offerhaus to the position of Chief Executive Officer. Effective January 1, 2011 Offerhaus will replace John van Vianen, who will become Managing Director of KPNs Business Market segment, a leading provider of communications services to business in the Netherlands with 2.5 billion in revenue in 2009. Van Vianen joined iBasis in December 2009 as interim Chief Executive Officer and a member of the iBasis Board of Directors following the completion of KPNs acquisition of iBasis. Under van Vianens leadership, iBasis has achieved a dramatic turnaround in 2010 with revenue growth of 24 percent in the first nine months of 2010 compared to the same period in 2009. Van Vianen will continue as a member of the iBasis board and will succeed Eelco Blok as chairman of the iBasis board as of April 1, 2011.

Willem Offerhaus brings more than 20 years of management and sales experience in ICT and business-to-business markets. Since 2008 he has been Vice President of Sales for KPN subsidiary Getronics, a leading provider of ICT solutions, where he was responsible for KPNs corporate market. Prior to joining KPN in 2008, Willem worked in Paris for Orange Business Services/FT as Senior Vice President, Global Sales. Orange Business Services is active in more than 180 countries. Previously, Willem was Managing Director of Equant Netherlands, where he led the merger of Equant and Global One in the Netherlands.

We have made tremendous progress at iBasis this year, putting the company on a very positive trajectory with strong growth in revenue, profitability, and free cash flow, enhanced focus on customers, and innovative new services, such as IPX, said outgoing iBasis CEO John van Vianen. Im confident that under Willem Offerhaus leadership and with the support of the iBasis and KPN Boards, the strategic initiatives weve undertaken will continue, and iBasis will continue to exceed customer expectations, expand its market share and lead the industry in innovation and customer excellence.

Prior to joining iBasis, van Vianen was Managing Director of Information & Communication Solutions (ICS) at KPN/Getronics and a member of the KPN/Getronics Executive Committee. He has held several executive management positions at KPN, including leading the KPN business unit that provides Data & IP Solutions to the national and international business markets, Senior Vice President of KPN ICT Services, and senior management positions within KPN/Qwest, including vice president of mergers and acquisitions. Van Vianen also represents KPN on the supervisory board of several ventures.

About iBasis
iBasis is one of the largest carriers of international long distance telephone calls in the world and a provider of retail prepaid calling services and enhanced services for mobile operators. The company offers a comprehensive portfolio of voice termination services, value-added messaging, signaling and roaming services for mobile operators, as well as outsourcing services for more than 1,000 carrier customers and partners, including many of the worlds largest fixed and mobile operators and VoBB service providers. iBasis operates a hybrid global network that includes one of the most extensive VoIP networks in the world, as well as TDM infrastructure. In December 2009 iBasis became a wholly-owned subsidiary of KPN. As a KPN company, iBasis leverages the full extent of KPNs global resources to help customers raise the value of their business. The Company can be reached at its worldwide headquarters in Burlington, Mass., USA at +1 781-505-7500 or on the Internet at

# # #

iBasis, KPN, and Getronics are registered marks. All other trademarks are the property of their respective owners.