Hello all,
What happened to me today in the server was a joke.  Left KSEA in B752 talked with SEA-CTR, no ATC in between.  Talked to DFW Center, No Problem.  GO to DFW Approach, no comms working, only chat.  I just spoke with Ctr at hand-off, switch freqs. No response from App,  Left msg in Box,  30 secs to response.  Controller gives me clearence to decend,  read back on radio.  Controller types in chat that I need to read Back.  Typed a read back.  Obviously controller and I can't hear each other!
In Life, you recognise the problem.  You know what the aircraft is going to do he filed a FP.  You don't know if the pilot can hear you, so you ask the pilot to make a 60 deg turn.  If he hears, he makes the turn, you know he can hear you.  If not you have a problem, and as the aircraft gets closer you clear space for him to land.  Other aircraft may have to hold, some may be able to follow in a visual approach.  Whatever it takes!!  What you Don't do is have a fit, put nasty notes in the flight strip, and whine like a baby.  Remember No chatbox in real life folks.