iBasis CEO to Discuss VoIP Carrier's Growing Market Share in International Wholesale Telecom at NYSSA Conference

Gneezy Presentation Will Highlight Strength of iBasis' Financial Performance Relative to Other VoIP Carriers

BURLINGTON, Mass., Nov 25, 2003 (BUSINESS WIRE) -- iBasis, Inc. (OTCBB: IBAS), the leader in Internet-based voice communications, today announced that company CEO Ofer Gneezy will discuss iBasis' performance and the status of VoIP in international telecommunications at the New York Society of Security Analysts (NYSSA) conference on Wednesday December 3.

In his remarks, Mr. Gneezy intends to highlight the growth drivers for wholesale telecommunications and iBasis in particular, the strategic benefits of VoIP, and the advantages that iBasis enjoys in the wholesale international telecommunications market as well as in the retail prepaid calling card market, which the company recently entered.

The NYSSA Conference, "VoIP as a Driver for Growth in Telecommunications: Not If, But When," will take place at the W. 44th Street Harvard Club from 8:30 a.m. to 5:00 p.m. Mr. Gneezy's presentation is scheduled to begin at 10:45 a.m. For more information or to register for the conference, visit the NYSSA web site at www.nyssa.org.

About iBasis

Founded in 1996, iBasis (OTCBB: IBAS) is a leading provider of wholesale international telecommunications services. For the past two years the company has been named by service providers as the best international wholesale carrier in Atlantic-ACM's annual International Wholesale Carrier Report Card¹. iBasis is a preferred provider for many of the largest carriers in the world, including AT&T, Cable & Wireless, China Mobile, China Unicom, MCI, Sprint, Telefonica, Telenor, and Telstra. iBasis has carried more than six billion minutes of international voice traffic over its global Cisco Powered Network™, and is one of the ten largest carriers of international voice traffic in the world². In addition to its wholesale international telecommunications services, iBasis provides retail prepaid calling cards to major distributors, utilizing the international iBasis Network. Based on its revenue growth from 1997 through 2001, iBasis was ranked the #8 fastest-growing technology company in North America and the #1 fastest-growing technology company in New England in the Technology Fast 500 national program sponsored by Deloitte & Touche. 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.

The New England Technology Fast 50 program is presented by Deloitte & Touche and Hale and Dorr, in association with the sponsor, Mazonson Inc. In addition, Mass High Tech and Trinity Communications are associated with the program.