Yamaha CS-700 Operation Manual page 32

Calls
The calls section allows defining behavior and options available to the user
around call behavior.
Enable Message Waiting indicator allows the dialer to show information on
possible voice messages that are stored on the server for this number.
Set DnD puts the phone into this mode by default.
Enable auto-answer automatically answers any incoming call. This setting is
not recommended to be used.
The Ring tone selection offers several ring tones as stored on the device.
Provide a voicemail number to allow picking up voice mails with one button
press from the dialer.
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