asterisk users - Jul 2003 - slightly OT /how to obtain 900 number

I'm interested in offering fee based support services by telephone.  Does 
anyone have any suggestions on how I could obtain a 900 number to do this?  
My initial thought is to have the 900 number terminate to my asterisk 
server which will connect callers to cus service reps / techs in various 
locations through IAX or SIP.  

I really would prefer to do this via 900 to avoid reps losing time having 
to enter and validate cc information but if anyone is familiar with an 
easy way to do this other than 900 please let me know.
AJ