Multiple RAS

The situatuion …9 sites 2 machines at a site. 1 Sco Unix and other NT Workstation (machines networked together)..NT machine has RAS connection back to central site…At central site (LAN 15 Workstations) I need users to be able to establish a telnet session through their server to throught the RAS connection to the Sco Unix box… I can do this now from the Remote server but not from the workstation a the central site…Any help or solution will be appreciated………I will provide drawing if needed…..