Internet Bandwidth Sharing

We are in an office sharing our 256k Frame Relay through a hub with other NT Servers in the building (4 in all) What we need is a reliable bandwidth management tool, or a method of piecing out the bandwidth to prioritize our users over the 4 other networks. Our router is shared through the network at the hub where all 5 networks have access. We give out one IP Address with each “outside” line connection.

Any help in managing these connections would be very much appreciated. We charge theoutside networks for this service, but its hard to “manage” or control how much they use.