No, the notifier component (the guy that's monitoring everyone's inbox) doesn't make any distinction about the source of the message or how it got to your inbox. Whenever a change is made in a subscriber's inbox, the notifer filters for new messages that are tagged as voice (i.e. they have a message class of IPM.Note.Voice.Unity) and if there's at least one that's marked unread, it'll trigger the lamp to go on if it's not already on and vice versa.
It'd be very difficult in Exchange to have to open each message and determine if it was sent to a DL (since Exchange "flattens" the delivery list, this is tricky). Even if possible this would add a lot of overhead to the mailbox monitoring process since we'd actually have to open each voice mail message instead of just filtering on it's message class.
In general, I'm reluctant to be selective about which messages trigger lamps/notifications... These are the types of things that cause calls to support with complaints of "delayed messages" and "I had a voice mail, why wasn't my lamp on or why didn't I get paged" etc... Also, things get sticky since you can address voice mail messages to many recipients (i.e. multiple DLs and individual subscribers). How would we determine which destinations had their lamps lit and which didn't?
One possible compromise would be something like not turning lamps on for messages sent with low priority. We can filter for the priority flag without having to open the message itself, which will keep the overhead down. Of course you'd still have some potential confusion when folks picked up their phone to check messages and discovered they had one or more even though their lamp wasn't on. This would also require that folks sending messages to DLs remember to mark their messages as low priority. But, that said, I still think it would be a better option than going the route where all messages sent to DLs don't trigger lamps.
Jeff Lindborg
Unity Product Architect/Answer Monkey
Cisco Systems
lindborg@cisco.com
http://www.AnswerMonkey.net (new page for Unity support tools and scripts)
