I am looking for information regarding ISP billing systems and feel this list is a great place to start my research. I want to evaluate next generation billing systems that have the following capabilities at a minimum IP support Usage based billing Robust Security Architecture Real time reporting Creation and management of user accounts Rapid provisioning of service offerings Activity tracking Rating Advanced billing capabilities International capabilities (Spanish a must) I would like to know what vendors play in this space and pro's and con's of any vendors you out there in the industry may have evaluated. Sample RFP's would be extremely helpful but I know that is a stretch. At a minimum, vendor names would be great. Thanks in advance!!!