Adding multiple users to single voice mailbox in Unity

Client wanted to add a shared line to 4 phones in CM. That was the easy part. After that I found that the public distribution list in unity didn't really give me what I wanted since when I did it that way the members weren't receiving the vm in their email. So I 1-Created a group in exchange(ShippingGroup), then a single user w/ group name(shippinggrp). 2- After that I added shippinggrp subscriber in Unity since you can't add a group under new subscriber. 3- I went to shippinggrp properties in ActiveDirectory , then delivery options and fwd the emails to the ShippingGroup. That's it. After that I left a voice mail and the whole group got the vm in their email.