Telematrix Spectrum Plus SP300 User Manual page 27

Using the Hold Feature
The "HOLD" key is used to place a
caller on hold. To use, simply press
the "HOLD" key. The LED above the
line-in-use will illuminate to indicate
that this line is on hold.
When the "HOLD" key is active, the
handset can be lifted off-hook or
returned to its on-hook position and
the line will not be disconnected.
return to the caller, simply lift the
handset.
Hold will also release when the call is
picked up from an additional extension
phone.
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