Hello, at first, sorry my english ist not so good. Okay, i have a problem with the 3CX VoIP Phone on Windows. If I get or do a call and will connect it internally, I get the error: System Failure. Everything else works fine. Only the Transfer (Intern and Extern) give me a Server Failure. I have a FritzBox 6360 Cable with the Provider unitymedia. Windows 64-Bit I hope you can help me. In Englisch or German Thanks.