VTech DS6121 - Manual (Page 42)

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Answering system
Call screening
You can listen at the telephone base to a caller leaving a message. However, if
you want to silence the telephone base when messages are being recorded, set
the telephone base volume to its lowest level (1). Remember to raise the volume
in order to hear your messages during playback.
Call intercept
If you want to answer a call while a message is being recorded, press /FLASH
on the handset.