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Please look at this document especially scenario number 2http://www.cisco.com/en/US/partner/products/sw/voicesw/ps2237/products_white_paper09186a0080192db6.shtml
Here's what you need from the CallManager side2 Voicemail Pilot number2 Voicemail Profile2 sets of voicemail portsOn the Unity side, make sure you match the voicemail port name with the correct Unity server.
This is a bit complicated as the audio port being used by softphone is RTP port range 16384 to 32767. While you can make an ACL out of this range, there might be some applications that might be using these port ranges.Another thing that you can try ...
Here is a very good document on managng storage space and even optimizing the database.http://www.cisco.com/univercd/cc/td/doc/product/voice/c_unity/whitpapr/storage.htm
