Abstract: In a Data Access Transport Service (DATS), Data Service Providers (DSPs) share dial-in access (e.g. analog modem or Integrated Services Digital Network (ISDN) access) resources from a common pool maintained by a Local Exchange Carrier (LEC) (or potentially a DSP. A system is disclosed wherein a Network Controller (NC) performs the role of DSP service partitioning, quota enforcement, and resource load balancing to ensure that a DATS provider can provide a high quality of service (availability, response time & consistent bandwidth) to subscribed DSPs and their end-users. The Network Controller assists in Internet Data call establishment and tear-down, with the ability to refuse calls when the associated DSP has exceeded its service quota. The Network Controller also assists in the routing of calls to one of the DSPs Network Gateways (or data routers), using a load balancing scheme that maintains a pre-defined relative load on given DSP Network Gateways.