Iwatsu ENTERPROSE-CS Owner's Manual page 129

 Or
 Press the Call Park key PARK and press the key representing the
waiting call
To alternate between calls:
 Press the Call Park key PARK
To answer the waiting call:
 Hang up on the first call and press the key representing the waiting call,
or, press the Call Park key PARK and press the key representing the
waiting call
To alternate between calls:
 Press the Call Park key PARK
Busy Intercom Callback
Allows you to instruct the ECS to inform you when a busy extension that you
called becomes idle. When the extension becomes idle, the ECS will call you
back. After you answer, the desired extension will automatically be dialed. If
your phone has a display, the display will inform you that the call is a Callback
and identify the extension. You may leave one Callback message.
When you make an intercom call and the extension is busy:
 Do not hang up
 Press the Feature key FEAT then dial
Callback key ICM CB key if assigned as a Multipurpose Key and the
lamp will be solid red
 Wait for a confirmation tone
 Hang up
To Cancel all Intercom Callbacks
 Press the Speaker key SPKR
 Press the Feature key FEAT then dial
Intercom Callback key ICM CB if assigned as a Multipurpose key then

dial and the lamp will turn off.
 Wait for a confirmation tone
 Press the Speaker key SPKR
IWATSU TELEPHONE USER GUIDE - 111

, or, press Busy Intercom

, or, press the Busy