you can get a tower or a server for a rack depending on the model
if you look in CCO for the model you have, you will get images
Cisco Unified Communications Manager Server Support Matrix
http://www.cisco.com/en/US/partner/prod/collateral/voicesw/ps6790/ps5748/ps378/prod_brochure0900aecd8062a4f9.html
to know which is CCM, try logging into CCMadmin. you could look at the server model, if it's not for CUCM then the server is not a CUCM.
what is the linux box? you need to find that out, just telling it's a linux box is not enough for someone to tell you.
http into the ip address from the server and you should get a page with some info
HTH
javalenc
if this helps, please rate
HTH
java
if this helps, please rate