Party Mic Icon

I’ve searched on this and can’t seem to find an answer (though, I think the answer is a “no”). When in a party, there is the Mic icon to the right of the party unit frames…I play on a LAN and have no need for voice chat and am looking for a way to disable the icon from showing up. I have all of the voice chat options turned off and was hoping that would do it…to no avail.

Is there any setting that governs this? Or is there no way to shut off the indicator?