Panasonic KX-TD1232 Manuel D’Utilisation

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Station Features and Operation (DPT/SLT)
User Manual
253
Conditions
The CO button pressed to join the conversation needs to be assigned as a Single-CO (S-CO) 
button.
After the user presses the CO button, the CO indicator light of the other extension flashes 
rapidly for only 5 seconds. Pressing the CO button again gives you an additional 5 seconds.
This feature overrides "Data Line Security" and "Executive Busy Override Deny."
When a two-party call is changed to a three-party call and vice versa, a confirmation tone 
is sent to all three parties. Eliminating the tone is programmable.
Programming Guide References
[990] System Additional Information
User Manual References