iBasis Earns GSMA Certification for International SMS Hubbing Service

SMS hub simplifies worldwide termination and opens new markets for mobile operators, providing a single connection to hundreds of mobile networks worldwide

BURLINGTON, Mass. – 10/21/2009 – iBasis (NASDAQ: IBAS), a KPN affiliate, today announced that the GSM Association (GSMA) has certified iBasis International SMS Hubbing Service, a short message service interworking solution that provides mobile operators with secure SMS transit and access to over 650 operator destinations through a single connection. A member of the GSMA, iBasis earned certification for the new service through the GSMAs Open Connectivity program.

The simplicity of the iBasis International SMS Hubbing Service eliminates the need for mobile network operators (MNOs) to negotiate numerous bilateral contracts with other operators around the world by providing a single point for commercial and technical SMS connectivity. The service federates interconnections with other GSMA-approved SMS hubs across the world for a standardized hubbing environment that guarantees security, roaming, return traffic and least-cost routing (LCR) between operators.

iBasis extensive relationships with mobile operators, especially throughout Europe and Latin America, make our new International SMS Hubbing Service particularly strong for operators needing to quickly and securely expand termination capabilities worldwide, said Paul Floyd, iBasis Senior Vice President of Global Products, Network, and Systems. This service reaches more than 95 percent of the worlds economy, and customers are already benefiting from additional revenues and efficiencies the SMS Hubbing solution provides. Our Open Connectivity certification builds on iBasis technical leadership in the industry from our work advising the i3 Forum on IP voice interconnects, to our successful trials of the GSMAs IP eXchange (IPX).

iBasis offers international SMS hubbing via SS7 (C7 in Europe) and IP connections. The service is designed to complement customers existing bilateral agreements via expanded SMS coverage and prepares MNOs to eventually transition to the GSMAs multilateral approach for Open Connectivity. The iBasis International SMS Hubbing Service supports all major SMS transport protocols, along with mobile number portability (MNP).

About the GSMA
The GSMA represents the interests of the worldwide mobile communications industry. Spanning 219 countries, the GSMA unites nearly 800 of the worlds mobile operators, as well as more than 200 companies in the broader mobile ecosystem, including handset makers, software companies, equipment providers, Internet companies, and media and entertainment organisations. The GSMA is focused on innovating, incubating and creating new opportunities for its membership, all with the end goal of driving the growth of the mobile communications industry. For more information, please visit:http://www.gsmworld.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, TDC and many other large telecommunications carriers such as Verizon, Vodafone, China Mobile, China Unicom, IDT, Qwest, Skype, Telecom Italia, and Telefonica. In October 2007, iBasis acquired KPN Global Carrier Services to create one of the three largest carriers of international voice traffic in the world (1), and KPN became a majority stockholder of iBasis. The company carried approximately 24 billion minutes of international voice traffic in 2008. 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.

# # #

1. Based on Telegeography 2009 and iBasis and KPN Global Carrier Services 2008 traffic.

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

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 atwww.sec.gov. Such forward-looking statements are only as of the date they are made.