Hello, Since I installed this 3CX for WIndows phone on Windows 8, my callers (or receivers) have been hearing an echo. I have tried with a hardwired headset and with a bluetooth headset with the same results. They hear themselves in an echo. This is very annoying to them. They do not hear it any other way except when they call me or I call them. This with people withing my organization and on the same telephone system (Asterisk, SIP, FreePBX) or on an outside line like a cell phone. What can I do to troubleshoot or solve this issue? All help is appreciated.