Installing a new 200 ICP 4.0, One group of sets has 4 lines and another has 3 lines. There is 1 receptionist in each group. All sets are 5212 IP sets. Both recepts want a mailbox, and the ability to hit a night key or anyway to get there group of lines to be answered by a night message. Bothare going to have there own night message. Is it easier to set up a phantom extension and when they leave have them forward there sets to that phantom and build a MB on it? Or is there a better way! Thanks!