Multiple handset use
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Answer a PTT call
You can respond to a PTT call whenever the speakerphone light is off, as 
described below.
When your handset receives a PTT call, the handset beeps and the screen 
shows Press and hold [PTT] to talk. 
When the other party is speaking, your speakerphone light is on, and 
your handset shows PTT From HS X To HS X (the first X represents the 
initiating handset number, the second X represents your handset number; 
a maximum of four handset numbers appear).
When your speakerphone light is off (the screen shows Press and hold 
[PTT] to talk), press and hold PUSH TO TALK on your handset. You will 
hear a chirp. Speak towards the handset.
While you are speaking, your handset screen shows PTT To handset: X 
(X represents the handset numbers of one or more destination handsets; 
a maximum of four handset numbers appear).
Your voice broadcasts to all destination handsets.
After speaking, release PUSH TO TALK. Your handset will beep.  
After the beep, if your speakerphone light is off, you can press and hold  
PUSH TO TALK to continue speaking, or the destination handset  
can respond.
Change a one-to-one PTT call to an intercom call
You can convert a one-to-one PTT session to an intercom call. 
When your handset screen shows Press and hold [PTT] to talk, press 
MENU/SELECT. The screen shows 
>
Intercom. 
Press MENU/SELECT. Your handset displays Calling other handset or 
Calling HANDSET X. The destination handset screen briefly shows Push 
to talk Ended and then Other handset is calling or HANDSET X is 
calling. The destination handset rings.
On the destination handset, press  PHONE/FLASH or any of the dialing 
keys (0-9, #, or TONE ) to answer the intercom call. Both handsets now  
show Intercom.
To end the intercom call, press  OFF/CANCEL or place the handset in the 
telephone base or charger. Both screens show Intercom ended. 
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Push-to-talk (PTT)