iBasis Brings the Benefits of International VoIP Services to Leading Swiss Operator; sunrise Selects The iBasis Global VoIP Network for High Quality International Service for Fixed and Mobile Traffic

Business Wire, Feb 15, 2006

BURLINGTON, Mass. -- iBasis, Inc. (OTCBB: IBAS), a leader in international long distance, VoIP, and prepaid calling cards, announced at 3GSM World Congress here that sunrise, part of the TDC group and the second largest telecom company in Switzerland, has interconnected with The iBasis Network(TM) for international voice services. The interconnection with iBasis enables sunrise to route international voice traffic over The iBasis Network, the leading global VoIP network, and expands iBasis' ability to complete mobile calls in the country.

Mobile operators have taken advantage of the iBasis international service portfolio, especially the company's PremiumCertified(TM) international routing product, which is specifically designed to deliver the highest quality of service for retail traffic. PremiumCertified features more than 700 routes that are actively monitored and managed to deliver quality that meets or exceeds retail quality benchmarks. Through a direct IP interconnect, mobile operators can fully leverage iBasis' VoIP expertise including sophisticated network performance monitoring and call routing systems based on the company's patent pending Assured Quality Routing(R) technology.

Increasing competition is driving many mobile operators to consider alternative international carriers that can provide quality while reducing costs. iBasis focuses on meeting mobile operators' pricing and quality requirements which will help sustain subscriber growth while minimizing capital and operational expenses:

--Lower termination cost with more than 1,000 direct routes in more than 100 on-net countries;

--Flexible pricing packages;

--High quality of call completion and ensured route stability; and a

--Fully managed solution for provisioning, routing, and quality monitoring

As a result, mobile operators are rapidly able to increase their international capacity with almost no additional capital investment. iBasis' cooperation with mobile operators in building out their international connections allows them to stay focused on increasing ARPU and margins and expanding their service portfolio to sustain subscriber growth in their domestic markets.

"The utilization of VoIP by mobile carriers mirrors our experience with fixed line carriers," said Ofer Gneezy, president and CEO of iBasis. "Leading mobile operators are recognizing that VoIP provides the perfect solution for extending the reach of their GSM network. We are very pleased to have sunrise join the growing number of mobile carriers connected to The iBasis Network. Our ability to deliver high quality of service to mobile network operators and our proven operational expertise is enabling them to reap the benefits of our global VoIP network and our interconnections with more than 370 carriers around the world."

According to Telegeography 2006, mobile operators account for a growing share of both originated and terminated international traffic. The growth in international calls that are either originating or terminating on mobile phones is outpacing the growth of new mobile subscribers. As a result, operators are beginning to view efficient international termination agreements as potential competitive advantages. Mobile users in Europe generated 60% of the world's total mobile-originated calls.

With the commoditization of voice services and price wars in most Western European countries, ARPU stagnation or decline can rapidly become a real threat for mobile operators. International calling packages combined to lower cost of transport can help mobile network operators maintain margin and grow their customer base and international usage.

About sunrise

sunrise is the leading independent telecommunications provider in Switzerland. Over 2.2 million customers enjoy the benefits of sunrise mobile, fixed network, and Internet services. The hybrid network based on GPRS, EDGE and UMTS technology provides cutting-edge mobile services to over 99% of the population and permits transmission rates of up to 384 Kbps. A wide range of high-quality voice and data services are provided via a high-performance fiber optic network with a total length of more than 7000 kilometres. As a founding member of the Starmap Mobile Alliance, an association of leading European mobile communications providers, sunrise offers its customers access to first-class services even while they are abroad. sunrise is the brand name of TDC Switzerland AG. The TDC Group owns 100% of the share capital of TDC Switzerland AG.

About iBasis

Founded in 1996, iBasis (OTCBB: 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, which are sold through major distributors and available at retail stores throughout the U.S. iBasis customers include many of the largest telecommunications carriers in the world, including AT&T, Cable & Wireless, China Mobile, China Unicom, MCI, Sprint, Skype, and Telefonica. iBasis carried 7.8 billion minutes of international voice over IP (VoIP) traffic in 2005, and is one of the ten largest carriers of international voice traffic in the world(1). For four consecutive years service providers named iBasis the best international wholesale carrier in ATLANTIC-ACM's annual International Wholesale Carrier Report Card(2). iBasis was also ranked among the fastest-growing technology companies in New England in the 2002, 2003, 2004, and 2005 Technology Fast 50 programs 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.