NEW BRUNSWICK, NJ, Oct. 7, 2009 (Marketwire) --

NEW BRUNSWICK, NJ -- (Marketwire) -- 10/07/09 -- Arbinet Corporation (NASDAQ: ARBX), a leading wholesale telecommunications service provider, today announces the extension of its Global Number Portability Service to the customers of NetNumber, Inc., the world's leading provider of next-generation addressing and routing technology. Arbinet's Global Number Portability Databases will enable NetNumber's many carrier customers to better leverage NetNumber's market-leading TITAN routing database platform. Arbinet has been managing its number portability databases for over two years, and as the sponsor of GlobalNumberPortability.Org is a proven leader in this space. Arbinet currently manages 100M queries a month against its platform for its customers. By partnering with NetNumber, Arbinet can further extend its service to a broader range of carriers, mobile operators and messaging providers as a natural step to improving global call routing and quality.

Number Portability, while providing many benefits to the consumer, introduces considerable complexity into the International Call Termination marketplace. Traditionally, carriers and service providers have relied on in-country carriers to correctly route the voice call or SMS/MMS message to the appropriate mobile network, but the increasing percentage of ported numbers and the extra costs associated with rerouting a call to the correct network are straining those commercial arrangements. Network Portability is currently available in over 52 countries worldwide with many more expected to enable portability in the next few years.

Arbinet is a proven leader of Global Portability information, having launched its Global Number Portability Service directly to its own customers in 2008. The service enables carriers to query a database during the call set-up process. The query returns the identity of the mobile service provider supporting that number. The carrier then uses that information to correctly route calls to the terminating service provider, saving transit fees and improving the quality of service. The call itself is carried on the normal interconnection with the appropriate mobile service provider. In providing this service to the marketplace, Arbinet can handle any query protocol, enabling easy interworking with both traditional and next generation VoIP based switches. Both the Arbinet and NetNumber services have been proven to interwork with the majority of traditional and next generation switches available globally, including SONUS, Veraz, Genband, Siemens, Ericsson and Cisco.