Panasonic KX-TD816 Manual De Usuario

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Station Features and Operation (DPT/SLT)
User Manual
181
<SLT>
If another user tries to access an outside line from a looked extension, the user hears a 
reorder tone.
With the KX-T7431, KX-T7433, KX-T7436 or KX-T7235, you can execute this feature 
using the display operation.
User Manual References