[Serusers] Open source billing solution for SER (VoIP)

[Jithendranath]

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