Nortel Networks 3100 - Manual (Page 67)

Advanced functions
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5. The MCG 3100 calls the voice mail server.
Note: You must use the Nokia telephone application to generate
DTMF tones.
Note: You can also call voice mail from the Recent preview panel by
selecting the voice mail entry, and choose Call from the menu. The
Recent preview panel can contain up to 10 voice mail and call entries.