■ Make and receive a PTT call
Select Menu > Settings > Tones > Push to talk settings to set the phone
to use the loudspeaker or headset for PTT communication.
Warning: Do not hold the device near your ear when the loudspeaker is
in use, because the volume may be extremely loud.
When connected to the PTT service, you can make or receive dial-out
calls, channel calls, or one-to-one calls. One-to-one calls are calls you
make to only one person.