Last week, I had a user tell me that something strange happened when she tried to forward a VM message to another subscriber. When she entered in the extension she wanted to forward the message to, she heard a message informing her that the extension she entered was associated with two different subscribers. Unity then prompted her to choose between two options, both of which were the same subscriber.
I checked Unity system admin and only found one subscriber for this particular extension. I also checked Active Directory and I only found one profile for the subscriber. Finally I checked the Global Subscriber List and that's where I found the duplicate entry. The two duplicate entries are exactly the same, but I have no idea how or why the duplicate was created.
As I looked through the Global Subscriber List, I started noticing there were quite a large number of subscribers with duplicate entries in there, probably one out of every five is duplicated. Most of the duplicates were carbon copies of each other, but some were slightly different. The duplicates that were slightly different shared the same alias, but had different Display Names, and DTMF Access ID's. For these specific entries, it almost looks like someone updated the Display Name and/or the DTMF Access ID, but for whatever reason, instead of updating the Global Subscriber entry, Unity decided just to create a new one with the same alias and the new Display Name or DTMF.
We have three Unity 4.0(4) SR1 servers in three different locations, and this problem is only happening in one of the locations. Any help you can provide would be greatly appreciated.