AT&T SYSTEM 25 Manual page 67

Putting a Call on Hold and Answering Another Call
1
Press
The light next to the button of the held call winks.
2
Press the button next to the flashing light.
Speak with the caller.
3
To return to the held call, press the button next to the winking light.
4
Single-Line
Using the Hold Feature
1
Press the switchhook.
2
Listen for confirmation tone and dial tone.
3 Lay the handset down, but do not hang up.
To return to the held call, press the switchhook once.
4
Continue with your conversation.
5
Putting a Call on Hold and Calling Another Person
1
Press the switchhook.
2
Listen for confirmation tone and dial tone.
3 Place and complete the second call.
To return to the held call, press the switchhook twice.
4
(If you hear dial tone, press the switchhook once more.)
2-54 Voice Terminal Features
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[HOLD]