Panasonic KX-TD308 Installation Manual page 113

Features
Conditions
Programming References
Feature References
Operation References
Confirmation tone 4:
Sent when moving from a two-party call to a three-party call, and
vice versa. (These are caused by Executive Busy Override,
Conference, or Privacy Release.) It is possible to eliminate this
tone by System Programming.
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Confirmation Tone 1 and 2 are provided to reconfirm the assigned
feature.
Section 4, System Programming
None
Not applicable.
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Features
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