Confirmed with DCS 2.7.11.21408.1 Open Beta in Caucasus and Persian Gulf Maps.
-Ground Crew only responds with first electric power connect request. No response at all for disconnect.
-ATC does not respond at all with voice or text, but comms menu changes still become available.
-Flight/Wingman do not respond at all.
Correct radio channels are set up and selected.
Volume knob appears to be turned up.
Not sure if it has to do with the new PTT functionality added.
DCS 2.7.11.21408.1 Open Beta (digitalcombatsimulator.com)