Panasonic KX-TD308 Installation Manual page 105

Features
Transfer, Screened - to Outside Line
Description
Programming References
Feature References
Operation Reference
-User Manual
Allows the proprietary telephone user to voice-announce to the
external party and transfer the call.
Class of Service programming determines the extensions that are able to
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perform this.
If a call between two external parties is established by this feature, the
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duration of the call period is restricted by a system timer. Hold Recall
is generated to the extension who transferred the call 50 seconds before
the time-out. Also Hold Alarm tone is generated to both outside parties
15 seconds before the time-out. The call is disconnected at the time-out
unless the extension restores the conference.
Section 4, System Programming
Section 3, Features
Hold Recall
DPT Features, Standard Telephone Features
Call Transfer - to Outside Line
Features 3-45