I had this problem and the only fix that I could do was change the extension number. We are using 0700 extension for our unity voice mail server and I had a users that had extensions 0701, 0702, 0703 and their voice mail boxes would not work. But when I move them to 0721, 0722, 0723 the voice mail boxes work just fine. I am guesting that Unity voice mail server reserves 10 lines when you setup the extension to communicate with it. Example if I use 0600 as my extension for my voice mail server then I can not have any voice mail boxes from 0601 through 0609. This seem to be on the voice mail server side of the house. You can have these extensions in the call manager but you can not give them voice mail box.
No we are not duplicating any extension numbers.Everyone has their own unique number. For example, the call handler is 0700 and the then end users start at 0701, 0702, 0703, etc. It's just these lower extension such as 0701, 0702, 0703, etc. cannot recieve voice mail. When an outside caller calls 0703 for example, they get the prompts to set up voice mail as if they were the person that number is asssigned to. As was mentioned above when 0703 was changed to 0723 everything worked fine. In doing this, we theroized that maybe these lower extensions were reserved for some reason by the server because of the call handler having the extension of 0700.
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