AT&T System 25 - Manual (Page 17)

Hold
You can hold calls while you attend to other matters and then
pick them up again. After you put a call on hold, you may then
hang up the handset without losing the call. To pick up a call
you have placed on hold you must use the same telephone
where you held the call.
If you want to put a call
extension, you must use on hold and pick it
the “Park” feature.
up from another
Using Hold
1 Press the switchhook.
2 Listen for confirmation tone and dial tone.
3 You may go back to your call by pressing the switchhook
again.
HoId - Placing Another Call
1 Press the switchhook.
2 Listen for confirmation tone and dial tone.
3 Place and complete the second call.
4 To return to the held call, press the switchhook twice. (If
you hear dial tone, press the switchhook once more.)
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