Hello experts, I was trying to set up a VoIP system with SER as my signalling proxy and was able to get lot of useful info from this mailing list. Thank you. I would like to know if there exists an open source billing solution which can fit seemlessly with SER and can handle realtime rating ( in a prepaid scenario). My initial study on this gave me the following link with a list of open source billing solutions. I would also like to know some reivews on these from experts like you. Since I have very less time to bring my project to life. http://www.voip-info.org/wiki/view/Open+Source+Billing+Systems Thanks a lot in advance. Regards, Jithu