I just installed the free version of 3CX in order to evaluate the product for our company. We have Vitelity as our VOIP provider. They require the G.729 codec. The free version does not have this codec. I have sucessfully setup our test system with extensions. When I enter the info for our Vitelity VOIP DID, it does say that it is registered. When I call the DID, it just goes to the Vitelity voicemail. Does anyone know if Vitelity does work with the commercial versions of 3CX that have the G.729 codec? Is anyone out there successfully using Vitelity with this product?