I have 3CX phone version 5.0.14900.0 and Skype version 220.127.116.11 (but i tried on newer and older versions). My problem is that i cannot make calls to anybody when skype is running. My calls are laggy and I cannot hear person on the other side. I have integrated sound card SoundMax. 3CX phone works fine if i dont start Skype. If i turn on application and turn off, 3xPhone still dont work. The only solution which i have for now is not execute SKype if i want make a call. My operating system is Win Xp proffesional with service pack 3 I heard that only me have problem with those two applications on one computer.