Hello
For Phantom > Extension > Extns VM do the following:
Set up a system Forwarding path which points to the Voicemail Extn (normally 2500) under Devices and Feature Codes / Station Related Information / System Forwarding Paths.
On the extn you wish to forward to voicemail give it the forwarding path you have just setup and then double click the forwarding path and tell it to forward IC calls.
Make sure this extn has an associated mail box.
Done
For Phantom Device > Hunt Group > Voicemail do the following:
Under Voice Processor / Devices / Applications create a new Call Routing Announcement, delete the default prompts under Day and Night, under digit translation set the Timeout to transfer to Mailbox number you wish to receive the VM for this group (You could create a new Non Associated MB if you wish)
In your Hunt Group set the recall destination as the Call Routing Announcement you have just created, set the recall timer and job is sorted!
Let us know if you need any more help but especially let us know if you manage to sort it