We are looking for SIP/RTP VB.NET Developer that familiar with PBX, IVR, SIP and RTP. Client/Server application have to be made, where server side is SIP Registrar/Proxy mixed with accounting and billing system. Clients will connect to it, establish phone call, they will b connected to another client or IVR will respond if there is no funds left to place a call. Same way, if during the call, funds went lower than allowed balance, call will be terminated.
Please vote if you have already done similar projects and you can show any demos, or at least have clear 100% understanding of what we need.
Visual [url removed, login to view] knowledge is the must.