We have current version of asterisk + a2billing (1.9.4) installed in our premises. We require someone to write Webmoney and [url removed, login to view] e-payment modules for a2billing.
6 freelancers are bidding on average $583 for this job
I have a lot of experience with webmoney. Never heard about PayPoint.Net but this won't be a problem, since i have a lot of experience with other payment systems. No upfront money required - payment upon completion.