I ran a CNet/3 BBS on my A3000 for several years. Honestly though, if you're going to run more than 2-3 lines you're going to need more than an 030/16MHz. (I had an 040/35MHz with 40MB of Fast RAM and even that choked when things got busy.
If I were to run an Amiga BBS today, I'd just run it on WinUAE. It's faster, and saves the wear and tear on your old valuable hardware.