Panasonic KX-TD816 Installation Manual page 483

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Features
Off-Hook Monitor
Description
Allows the KX-T7431, KX-T7433, and KX-T7436 digital
proprietary telephone users to let the other users listen to the
conversation through the built-in speaker, while continuing the
same call using the handset.
Conditions
This
is effective with a handset conversation.
Programming References
Section 4, System Programming
[
1481 Off-Hook Monitor
Feature References
None
Operation References
DPT Features
-User Manual
Off-Hook Monitor