ARBX Arbinet Corp. (MM)

Arbinet Corporation (NASDAQ: ARBX), a leading wholesale voice and data telecommunications service provider, announces today at International Telecoms Week (ITW) that Roshan, the leading GSM cellular service provider in Afghanistan, has contracted to utilize Arbinet's thexchange™ marketplace to buy and sell international voice communications and PrivateExchange(SM) to facilitate direct interconnects between it and correspondent carriers and bi-lateral partners.

By utilizing Arbinet's thexchange, Roshan gains access to a platform where more than 1,100 carriers and service providers trade, route, manage and settle voice traffic. Roshan can source high quality routes that allow it to provide its retail customers with cost-effective international voice services. It can offer its own routes to the marketplace in an easy and cost-effective manner. Arbinet's CreditWatch(SM) credit management and settlement technology, which is backed by third-party underwriting, guarantees fast, reliable payments for traffic received.

With PrivateExchange, Roshan can interconnect directly with corresponding bi-lateral partners over Arbinet's network. Arbinet will manage routing, billing and settlements, and provide any necessary TDM or VoIP protocol conversions. Roshan and its corresponding service provider partners will negotiate pricing and volume commitments directly between themselves.

"Arbinet's thexchange and PrivateExchange services are a key part of Roshan's strategy to provide high-quality and reliable telecommunications service to the people of Afghanistan," states Karim Khoja, chief executive officer, Roshan. "Using Arbinet's thexchange marketplace to trade traffic gives Roshan access to a majority of global service providers and carriers to buy and sell voice traffic. By using PrivateExchange, we will be able to easily develop bi-lateral routes and send and receive traffic with designated telecommunications providers. Both these services enable Roshan to easily and efficiently work with the international marketplace to provide customers with unmatched quality, reliability and value."

"We are very pleased with Roshan's selection and utilization of our voice services," states Dan Powdermaker, Arbinet's Senior Vice President of Sales and Marketing. "With one interconnect, Roshan gains access to two unique International Voice Services. In an industry where most operators are looking for new efficiencies when delivering international voice services to their end-users, Arbinet's PrivateExchange and thexchange services give Roshan high-quality voice access to carriers and service providers across the world with unmatched flexibility."

Arbinet offers three ways for carriers and service providers to originate and terminate international voice traffic. PrivateExchange is an easy to use, low-risk outsourcing approach that enables service providers to create virtual direct routes and aggregate existing interconnects. thexchange is the industry's leading marketplace for buying and selling voice communications. Arbinet Carrier Services is a standard wholesale service with no fees, a single invoice and rate lock. It uses supplier codes in its wholesale routing plans.

For more information about Arbinet's Carrier Services, thexchange™, or PrivateExchange(SM), please visit www.arbinet.com or e-mail sales@arbinet.com.

About Arbinet Arbinet is a leading provider of international voice and IP solutions to carriers and service providers globally. With more than 1,100 carriers across the world connected to Arbinet's network, Arbinet combines global scale with sophisticated platform intelligence, call routing and industry leading credit management and settlement capabilities. Customers and suppliers include many leading fixed line, mobile, wholesale and VoIP carriers as well as calling card, ISPs and content providers around the world who buy and sell voice and IP telecommunications capacity and content. For more information, please visit www.arbinet.com or call +1.917.320.2000 or email sales@arbinet.com.

About Roshan Roshan (Telecom Development Company Afghanistan Ltd) is Afghanistan's leading telecommunications provider, with coverage in over 230 cities and towns and approximately 3.6 million active subscribers. Roshan directly employs more than 1,100 people and provides indirect employment to more than 30,000 people. Since its inception seven years ago, Roshan has invested over $450 million in Afghanistan and is the country's single largest investor and tax payer. Roshan is deeply committed to Afghanistan's reconstruction and socio-economic development. The Aga Khan Fund for Economic Development (AKFED), part of the Aga Khan Development Network (AKDN), is a major shareholder of Roshan and promotes private initiatives in building economically sound enterprises in the developing world. Also owned in part by Monaco Telecom International (MTI) and TeliaSonera, Roshan brings international expertise to Afghanistan and is committed to the highest standards of network quality and coverage for the people of Afghanistan.

Forward-Looking Statements This press release may contain forward-looking statements, including forward-looking statements regarding anticipated future revenues, growth, capital expenditures, management's future expansion plans, expected product and service developments or enhancements, discussions of strategy, and future operating results. Such forward-looking statements may be identified by, among other things, the use of forward-looking terminology such as: "believes," expects," "intends," "may," "will," "should," "confident," "work to," "seeks," or "anticipates," or the negative thereof or other variations thereon or comparable terminology, or by discussions of strategy. Various risks and uncertainties may cause Arbinet's actual results to differ materially from those express or implied in such forward-looking statements. Please refer to Arbinet's most recent Annual Report on Form 10-K and other periodic and current filings that have been filed with the Securities and Exchange Commission for a description of the risks and uncertainties that Arbinet faces. Arbinet assumes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, and such statements are current only as of the date they are made.

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Ilissa Miller Jaymie Scotto & Associates 1.866.695.3629 Email Contact Michelle Midura Arbinet 1.917.320.2090 Email Contact