How do I put a call on system hold?

Putting a call on SYSTEM HOLD:
When caller is on the line press the HOLD button for 2 seconds.
That makes every phone’s HOLD button light up.
(Pushing HOLD Button on time quickly puts in hold on your phone only.)
On another phone press the HOLD button to see what line the call is on then enter that line number or press the button for that line.

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