Echo

[thominfotech.com]

This has been a headache for me as well. The sidetone adjustment might help, though I can't get an answer as to what the range represents. Additionally, I changed it in the 3CX template and autoprovisioned afterwards. To make sure, I exported the config and sure enough, the change was made. I tried -1 and it appeared to completely mute the sidetone. A few minutes later it was back - loud enough to hurt your ear when blowing into the handset.

The setup here is 3CX with a Cisco SG300-28P switch and five T46G's. The customer hasn't paid for the system yet and they're about to have me pull it out and go back to multiline phones. That's just plain embarrassing.

** Quick Update - it appears that you have to reboot the phone in order to effect the change in sidetone. I just tried minus 40 and it seems to have removed all but a smidge of the sidetone. I will update this post if it fluctuates.