You can't set an MWI appearance against a ring group, the MWI (and therefore the mailbox number) has to be a line on a set, but it can be a non-prime line. Normally when we set up a system, we program a 5340 or 6940 as a Trusted device and place all the DN's we need for this sort of thing as single line appearances on that. Then over in the MiCollab NuPoint, program the mailboxes and make the Ring Group an associated extension on the mailbox. So, caller calls the ring group, it overflows to VM, ends up in a mailbox, and then lights the light for the non-prime line appearance and also the MWI appearances on the phones that need it.