U.K.-based Nexagent is wholesaling to U.S. providers its MPLS service that maintains quality of service as MPLS traffic crosses from one carrier's network to another.

Different providers use different methods of insuring service quality within their own MPLS networks, so when it comes time to hand off traffic to another carrier, it is sometimes impossible to maintain service quality. The quality markers aren't interpreted by the receiving network as traffic crosses network boundaries.

Nexagent has developed software that maps service-quality markers from one carrier to the next. In addition, it has set up peering points where these inter-carrier connections can be made.

Nexagent has already signed up U.S. providers China Telecom USA, Fibernet and Versatel, and says it will have more U.S. customers to announce soon.

The company is also licensing its underlying software called Multi-carrier VPN Lifecycle Management System directly to carriers that want to maintain QoS via private arrangement with a select group of carriers.