NEC UNIVERGE SV9300 DT410 User Manual page 4

TERMS
Dial Tone You will hear the dial tone from handset when you hang up the hand set. If you press speaker
key, you will hear the dial tone from speaker.
Special Dial Tone If you press the transfer key while you are in conversation with calling party, you will hear
the special dial tone.
Ringback Tone When you dial an extension number, you will hear the ringback tone from handset.
DESCRIPTION
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PREFACE