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Deskset operation
PTT to all handsets and the main base
When the deskset is idle, press the PTT key. Press  DIR or CID
 to 
choose #: All. Then press and hold PTT until the deskset displays 
PTT to: All Release PTT key to stop.
-OR-
When the deskset is idle, press and hold the PTT key until the deskset 
displays PTT to: All Release PTT key to stop.
When the connection is made, both the caller and the destination parties 
hear two beeps.
Speak towards the deskset speakerphone. Your voice is broadcast to 
all extensions. Release the PTT key after speaking. There is a three-
second PTT wait state with -MUTE slowly flashing on the screen and the 
MUTE indicator flashing. During the PTT wait state, if necessary, you can 
press and hold the PTT key to continue to speak towards the deskset 
speakerphone.
Any system device can reply. See Answer a PTT call in the user’s manual 
of SynJ SB67118, SynJ SB67138 or SynJ SB67108..
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Push to talk (PTT) intercom