Many years ago, when we used telephone modems (there was no Internet yet) there was a setting, in the software which you used to talk to the modem, for "Echo" - some modems would echo the text you types back to you, some wouldn't.
In whatever application you are using for communication - NetConsole? - look for a setting to control echo, and set it to off.
Sorry I can't be more specific, I'm not familiar with all that, but being old sometimes has its advantages...
