Are you tired of paying for expensive VoIP Billing service, and can't afford a US$6000 VOIP billing solution? Now you can get a VOIP billing solution for as less as $469.WinRadius is a standard Radius Server. it authorizes, authenticates and bill the calls,  stores the call history in MsSQL/MySQL/Access database.   it  supports more than 100 kinds of gateway, Softswitch( Quintum, Cisco, GnuGK). WinRadius can authorize the calls by user/password or by IP address of the  gateways.  More Info