Hi Folks, I am just putting this out there to see if anyone has had any type of similar issue. I can't verify exactly where the problem exists, so there is nothing saying for certain it is an issue with 3CX (to be honest it is most likely not). Here is my client's configuration (at a very high level): PSTN Lines (Provided by Shaw Communications - Cable TV provider) --> Sangoma A200 4-PORT FXO Card --> 3CX --> 5 GrandStream IP Handsets (The Sangoma is running NBE and exists on the same box as 3CX) The issue that they are experiencing is intermittent audio cut-out on outside calls. The remote party can hear the local party fine, however the remote party audio cuts out (as if a mute button is being pressed) on the local set. This happens very often in the span of single call. I have ran through every log file for both Sangoma and 3CX and all looks ok, but the client has gotten so frustrated with this behavior that they have pulled the analog lines from the 3CX/Sangoma box and connected up their old phones. Has anyone seen this before? Can someone point me in the right direction before my client throws me off a bridge :cry: ?