[OpenSER-Users] Prepaid SIP

Hello all, Actually i have a testing setup which facilitates to give accounting details to mysql db once call was end by any one of the uac. But if i want to have a prepaid solution like our mobiles i dont found any solution till now on open source some of my friend suggested to go for B2BUA from vovida.org does anybody using this ? is this real that this can work for prepaid stuff? if not just let me know otherwise i will waste my time in doing some research on something not useful if not what might be the other ways to get around the problem of prepaid billing i know we can do this using b2bua, can we go ahead with asterisk? waiting for valuable suggestions -- Srinivas Antarvedi