After re-watching most of the old Star Trek shows, I noticed something after many episodes. When they communicate in the show most times they hit their communicator, after responding the receiver of the original transmission would just stop speaking to the transmitter. My question is do the communications just stop or is there a length of time the communications stay open. I have seen in some episodes that they receiver will hit the comm badge again to end the communication.
It seems that there would be a standard to adhere to in Starfleet, but the task seems so erratic in the shows.