Incom ICW-1000G Global User Manual page 50

If you set PTT configuration properly, you can see the PTT icon on idle window, and you
can switch to
PTT window through Options soft menu(PTT is only enabled with PTT enable set)
or if someone broadcast PTT with your setting the window change to PTT mode
automatically.
However, the setting value as Multicast Addr, Port and Channel should be same value. If
that value is
different, you can not communicate with others even though you are
on PTT mode. You should disable PTT setting, if you do not want PTT
mode any more.
To send PTT broadcast
① you press and hold the
indicate you can send voice
② Release the
③ In listen mode, you can not switch to Speaking mode. To send voice again, you
should wait to Standby mode then press and hold
When you're finished a conversation through PTT, you should disable the PTT mode
in PTT Settings. With incoming call, the state changes to ringing immediately. (always
high call priority)
button. Then status change to speaking mode to
button, when you finish speaking.
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button.