We did this for another company quite some time ago. The company was
running MajorBBS and a TCP/IP add-on. We created a generic account in
the PortMaster that performed an rlogin call (so the connection would
be 8-bit and z-modem transfers would work...didn't work with telnet for
some reason) to the BBS. It worked great.
If the BBS in question can't be accessed via TCP/IP, I'm not sure how you
could aggregate the calls to the PM and forward them on to the BBS.
Damien