Iwatsu ADIX VS Owner's Manual page 91

To answer a call:
Press the Headset Control key when receiving a ringing or
incoming call.
To end a call:
Press the Headset Control key to disconnect when finished
with the call.
To transfer a call using Screened Transfer:
Press the TRAN key.
Dial the telephone number.
When the party answers, press the Headset Control key.
To transfer a call using Unscreened Transfer:
Press the TRAN key.
Dial the telephone number.
While waiting for the called party to answer, press the
Headset Control key.
To place a call on hold:
Press the HOLD/DND key. An ICM dial tone is heard.
Dial another number or press the Headset Control key.
To retrieve a call from hold with Headset Control key idle:
Press the Headset Control key, then press the line key on
which the party is holding.
To receive a call from hold with Headset Control key active:
Press the line key where the party is holding.
To retrieve a message:
Press the MBOX key, then the Headset Control key.
To change from headset use to speakerphone use:
Press the SPKR key, then press the Headset Control key.
Digital Telephone User's Guide - 81