"On June 30, 2008, the Commission released the InterCall Order, in which the Commission determined that InterCall, Inc. (InterCall) and all similarly situated audio bridging service providers are required to contribute directly to the universal service fund (USF).As part of the InterCall Order, the Commission also directed the Universal Service Administrative Company (USAC) to conduct outreach to both stand-alone audio bridging providers and integrated teleconferencing service providers to ensure that such providers properly contribute directly to the USF based on their interstate and international end user revenues derived from providing audio bridging services."
The FCC Public Notice is available here.