NEC ITY-6D Start Manual page 21

Ringer volume (phone/headset):
Press the Up/Down key on the Cursor pad while the phone is not in use.
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VOICEMAIL
1.
While the phone is not in use, press the "Voicemail" softkey.
2.
Enter the voicemail PIN followed by #.
3.
Press 1 to listen to new voicemail messages.
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