Panasonic KX-TD816C User Manual page 216

Station Features and Operation (DPT/SLT)
Executing
Any Telephone
If you hear a busy tone after making an intercom call;
1
Dial 1.
To talk to the third party
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If OHCA is activated by the other party when you are engaged in a call using the handset, you
hear a confirmation tone and then the caller's voice through the built-in speaker of your PT.
Speak with the third
party through microphone.
The caller's number or name is shown on the display for
five seconds in 10 seconds intervals.
<PT Display Example>
123: Tony
You can talk to two parties individually.
216
Wait for an
Confirmation tone
answer and talk.
Caller's extension number
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