hmmmm. Well I don't use dial-up or mandrake but the first stop you ought to make is to:
Check out the doc section at the top I am sure there is something in there. Just remember that connecting dial up is connecting dial up. The protocol is the same and you should already know the basic stuff. Post back if you get stuck.
Plus, since the LQ.org community will be more than happy to help you prehaps you'll devulge what company you work for. I would be interested to know what isp's are going forward with Linux support. I may switch.