At 07:33 AM 09-05-2017, gnorbury@bondcar.com [op25-dev] wrote:
Suppose it depends at what point in time you start counting messages being exchanged. If the radio is already turned on and affiliated then there will be a single request and grant exchanged, otherwise there will be more messages.
Fairly hard for a turned off radio to PTT. Radios register and affiliate as soon as they're turned on and dialed to a trunk talkgroup. So PTT --> request --> grants.
That said, from the perspective of someone passively monitoring the control channel for the purposes of listening to the chatter, mostly all they care about seeing is the grant and end messages.
The mythical end messages. Again, how would subscribers on a voice channel see an end message on the control channel?