Make a channel call
To make a call to the default channel, press and hold the volume up (PTT)
key. A tone sounds, indicating that the access is granted, and the phone
displays your nickname and channel name.
To make a call to a non-default channel, select Channel list in the PTT
menu, scroll to the desired channel, and press and hold the volume up
(PTT) key.
Press and hold the volume up (PTT) key the entire time you are talking,
and hold the phone in front of you so that you can see the display. When
you have finished, release the volume up (PTT) key. Talking is allowed on
a first-come, first-served basis. When someone stops talking, the first
person to press the volume up (PTT) key can talk next.