Panasonic KX-TDA15 User Manual page 63

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To retrieve the held call, press the TRANSFER button, Recall/hookswitch.
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Even if you go on-hook while transferring a call, it is transferred.
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After the call is transferred, the line becomes idle.
Customising Your Phone
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3.1.3 Customising the Buttons
Create or edit an ISDN-Hold button.
1.4.1 Transferring a Call (Call Transfer)
User Manual 63