Draytek Vigor IPPBX 2820 Series User Manual page 72

Available settings are explained as follows:
Item
Voice Mail Configuration
Description
Extension for checking messages - The number specified
here is used for the user to listen personal voice mail from
IP PBX device.
Voice mail remote access number –Type an access
number for authentication. It will be used for the user to
check the voice mail remotely.
For example, your extension is 100 and the number typed in
this field is 889. When you are outside the company and
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VigorIPPBX 2820 Series User's Guide