Panasonic KX-F280C - Manual (Page 56)

Transmitting documents with manuai operation
From a touch tone phone:
Your caller may call your unit, and then press * to
change the unit to the fax mode,
They then may start transmission upon hearing the
fax tone by pressing their start or transmit button.
From a rotary (pulse) phone:
Your caller may call your unit, and then press the
mute button or cover the mouthpiece of their handset
to change the unit to the fax mode during the greeting
message.
They then may start transmission upon hearing the
fax tone by pressing their start or transmit button.
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