Panasonic VA-1232 - Manual (Page 30)

You can talk hands-free through the built-in microphone and speaker.
Before speaking make sure that microphone indicator is lighting. If it does not, press MIC
key.
For muting the microphone, press MIC key while talking.
You can adjust the speaker sound with the speaker volume control.
Pressing the MIC key, during conversation, enable to mute your voice for outside line.
Calling
1. Press the line key (or for an extension press ON/OFF key)
* Listen for the outside or intercom dial tone from the
speaker. M/C indicator will flash.
2. Dial the telephone number
3. Speak when answered
4. Press ON/OFF key when call is completed
Answering
1. Press the line key
2. Talk through the microphone
3. Press ON/OFF key when call is completed
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