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iBasis TruePrompts™ Progam Promotes Consumer Trust in Prepaid Calling Cards

BURLINGTON, MASS. - October 9, 2007 -iBasis, Inc. (NASDAQ: IBAS), the global VoIP company, today announced the launch of its TruePrompts™; campaign, a nationwide program that guarantees that customers can receive exactly the minutes announced or "prompted" at the beginning of each call placed using any iBasis TruePrompts calling card.

With TruePrompts, iBasis is reinforcing consumer trust in the company's prepaid calling cards, which are sold through leading distributors in retail outlets nationwide. All iBasis prepaid calling card products throughout the United States now feature TruePrompts, which is easily identified by the bright yellow and green logo on all cards, posters and other point-of-sale materials.

As one of the largest carriers of international phone calls in the world, iBasis is committed to growing its retail calling card business through the continued support of its extensive distributor network. The TruePrompts campaign will help build consumers' confidence in the true value of their cards by delivering the minutes prompted.

"A very large portion of international calls from the United States are placed using prepaid calling services, including iBasis retail calling cards," said Ofer Gneezy, president and CEO of iBasis. "TruePrompts reflects our commitment to providing international calling service that consumers can count on for high quality service and honest value."

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, 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, 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.



iBasis and Pingo are registered marks; PremiumCertified and The iBasis Network are trademarks of iBasis, Inc. 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. 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 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; and (vi) the other factors described in the Company's 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.