AT&T MERLIN Plus Training Manual page 28

To put a call on hold:
Action
1. Touch the Hold button, located
above the dial pad on the right
side.
2. When you want to return to the call
that is on hold, press the line
button that has the flashing green
light.
Note: If the phone you're using does not have a line button (for example, if the
phone is an internal use only phone with no outside lines assigned to it), you can
receive an outside call and put it on hold. To resume the call that is on hold, touch #
and then *.
If you find that you regularly need to return to a call that is on hold and your phone
does not have line buttons, you can program an "unhold" (Hold Retrieve) button to
use instead of # *. Refer to the Programmable Features section for the procedures
to program and use a Hold Retrieve button.
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Result
The green light next to the line you
are on begins to flash and the red
light goes off. You are temporarily
"disconnected" from that call.
(Your phone will ring periodically if
you keep the line on hold for more
than a minute.)
You are "reconnected" to the line.
The red and green lights are on.