Draytek Vigor IPPBX 2820 Series User Manual page 176

4. There are two options, Simultaneously and Sequentially for Hunt Rule.
Simultaneously means when someone dials 200, the three extensions belong to 200
will ring at the same time. If Sequentially is selected, every extensions in such group
will ring one by one. The ringing time for each extension is determined by Timeout
setting.
5. When no one answers the phone call, the following action will be determined by
Overflow Rule. There are five selections for people to choose.

Terminate: Time is up and no one answers, the phone call will be hung up
automatically.

Keep Ringing: If no one answers, the phone call will ring continuously till
someone lifts it.

Forward To Group: If no one answers, the phone call will be forwarded to another
hunt group.

Forward To Extension: If no one answers in certain extension, the phone call will
be forwarded to another extension in such group.

Voice Mail: If no one answers, the phone call will be forwarded into a voice mail
of specified extension.
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VigorIPPBX 2820 Series User's Guide