Iridium extreme ptt User Manual page 217

Once the talkgroup floor is granted, audio from your TALKING device is
transmitted to all participants on the talkgroup session. Press and hold the
PTT Button while you are speaking to continue the transmission to others
on the talkgroup.
Releasing the Floor on an Active Talkgroup Session
You must release the PTT Button when you are finished talking to stop
the audio from your device from being transmitted to the other active
participants on the talkgroup session. This releases the floor, changes the
display on your device from TALKING to OPEN and causes the Release Tone
(two ascending notes in rapid succession) to be played. The displays on
the other devices participating on the talkgroup session then shift from
LISTENING to OPEN and the Release Tone is played to notify them that
they may now request the floor by pressing the PTT Button.
Listening to a Talkgroup Session
If you wish to listen to a talkgroup session, the device must have that
talkgroup as the Home Talkgroup (see Talkgroups List on p. 228). When the
talkgroup becomes active and members of the talkgroup speak, the audio
is played and the device displays LISTENING.
Ignoring a Talkgroup Session
You can exit an active talkgroup session at any time by pressing the right
soft key, labeled Ignore, when you want to stop LISTENING. This stops
audio for that talkgroup session from playing on your device. When the
session ends, any subsequent sessions that begin are broadcast to all
devices that have that talkgroup as their Home Talkgroup. If you ignore the
talkgroup accidentally and want to rejoin the current session, navigate to
the Talkgroups List (see p. 228) and join the talkgroup again to restore the
audio for that session.
Scanning Talkgroup Activity
Press the right soft key, labeled Scan, (when displayed) to move into
Scan State to scan the audio of active talkgroups for which your device is
provisioned. Scan State provides information about the activity of those
talkgroups and plays the audio. Only audio for talkgroups that are actively
communicating is sampled while in Scan State. You will hear a single
distinctive tone indicating the talkgroup change.
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