Group voicemail can be set to answer calls when no users are available, for example, Out of Office Hours.
Navigate to "Setup", then "Voicemail". Click "Create Group VM". Assign a name and the destination email for the voicemail messages as below.
NB - We have changed the way voicemail's work. They no longer play the automatically generated message as this received bad feedback. Therefore, the voicemail message must now be recorded and uploaded using the "Media" Section.
Voicemails can no longer be assigned a DDI within the configuration. This is by design from user feedback to avoid any confusion this causes.