Arbinet's Private Exchange Provides Global Interconnectivity Solutions

Washington DC, USA – May 24, 2010– 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 PrivateExchangesm to facilitate direct interconnects between it and correspondent carriers and bi-lateral partners.