Asterisk A2billing Freeswitch Voip

We currently use elastix and a2billing on VPSs to offer our clients a hosted ITSP solution. We would like to implement the following VPSs on OpenVZ containers with High Availability and solid performance -Elastix for Hosted PBX and Call Centers -A2billing for Clients looking to start Calling Card Companies, all features with Custom GUI (look and colours and Logos) Sign Up module and Customer Interface that intergrates with Payment Processor API -FreeSwitch and a billing software for us to manage minutes charges across our client base. Maybe for simple IVR and Virtual PBX Customers We are open to other suggestions as well. For more info please contact us.