What would be the best way to have a DID over PRI ring on multiple sets, then have that DID go to a specific mailbox for one of those sets. In this scenario a user has his primary DID, plus a secondary DID that he gives out for select people (wife, kids etc). They also ring on his assistant's set and ideally on his iPhone softphone when he's out of the office, simultaneously. I've tried a Group DN but I can't get it to ring to the user's primary mailbox. Thanks.