Hello, you should normally post this question in the telephony section - as Reza mentioned, but while I'm here I'll try to help.
Firstly you need a valid cisco support contract and your cco login should be associated with this. And just follow the selections as you can see below.
at www.cisco.com
search for 'cisco unified communications manager'
Or you can navigate to it like this:
Im not sure if they have the ISO images available, however - I have seen the virtual server templates that are available.
Hope this helps.
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