VOIP H323 DLL Soft Phone SDK allows you to make a simple program for connecting and conversating with anyone having a direct IP Address. The Gateway or the Gatekeeper can also be used to connect to /or from PSTN lines.

Now VOIP open source projects have made it easier to implement a customized VOIP Solution eliminating costly PSTN lines. Though this implementation might turn out fairly complex our VOIP Implementation Team at Research-Lab will guide you remotely for the same.