Panasonic DBS 40 Operating Manual page 140

Chapter 4. Key Telephone Features
Related Programming
Considerations
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The LED of the Talk Back key flashes green.
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The current call is held automatically.
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3. Press the Talk Back key again to return to the original call.
The LED of the Talk Back key goes off when the Call Waiting party
hangs up.
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Version 3.1 or higher)
FF3 (Extension): Extension Class of Service Assignment (CPC-AI1 and
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CPC-B Version 3.1 or higher)
FF3 (Extension): Call Waiting/OHVA
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Message code 8 cannot be used from an SLT. (The digit "8" is used to
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transfer calls on SLTs.)
Call Waiting can be used without the user entering a message code.
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Call Waiting is cancelled when the sender replaces the handset.
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If the called extension has DND activated, has a call on hold, is ringing
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(from another call), or is engaged in a conference call, Call Waiting cannot
be sent.
A call on an outside line can be placed on hold before Call Waiting is
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answered to avoid terminating the original call. An Intercom Call,
however, must be terminated before Call Waiting can be answered.
If Onhook Call Transfer has been enabled and you have placed an outside
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line on hold to answer Call Waiting, replace the handset after the other
extension hangs up. If the caller hangs up fist, the held call will be
transferred to the called extension.
Call Waiting cannot be sent
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Section 700 - Operation
to an ML key.