ARBX Arbinet Corp. (MM)

Arbinet Corporation (NASDAQ: ARBX) announces today at Comptel's Spring 2010 Conference and Exposition that it has introduced into its network a new level of routing flexibility for its Arbinet Carrier Services (ACS) customers. Customer Based Routing(sm) enables a service provider or carrier customer to select from multiple grades of service for each destination over a single trunk group. A carrier can select routes with guaranteed CLI delivery and Mobile Subscriber Roaming Number (MSRN) support from Arbinet's Premium Mobile routing table for destinations where its customers need the highest quality of service with advanced features. On the same trunk group, it can choose more aggressively priced routes from Arbinet Quality or Value routing tables for destinations where cost is the most important attribute in route selection. And if it needs CLI delivery, but not MSRN support, it can select routes from Arbinet's Premium table.

"We set as a goal for ourselves in 2009, to leverage the technology at the core of our voice network and increase the flexibility with which we work with the marketplace," said Dan Powdermaker, Senior Vice President, Sales & Marketing. "We launched Carrier Services, a traditional wholesale way of working with customers and suppliers. Utilizing supply from the more than 1,100 service providers and network operators that are connected to Arbinet's network, ACS offers a number of grades of service ranging from an aggressively priced wholesale table to a recently announced Premium Mobile table with direct termination to more than 250 fixed and mobile network operators and guaranteed Caller Line Identity (CLI) transmission and delivery to terminating network suppliers. Customer Based Routing is the latest innovation to be deployed in our network. It enables our sales team to customize routing for each customer based on the customer's unique needs."

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

For more information about Arbinet 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 the Arbinet 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.

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 Part I, Item 1A of the Company's Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 16, 2009, and other 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