Bitstream Services involve interconnection of two networks, whereas DSL Resale Service is a pure resale service.
The Bitstream Services are Layer 2 Services, which are provided at a point of interconnection. In addition, the Access Seeker assigns the IP addresses to the Customer.
In the case of DSL Resale Service, there is no connection between the Access Provider and Access Seeker networks. The Access Provider would be required to offer billing information and like services to enable the Access Seeker to bill the customer. In this case, the Access Provider assigns the IP addresses to the Customer.