Hi Partha,
1. You will need to arrange your licenses before upgrading. Without
the Software feature License the Callmanager Service won't start.
2.The Restricted version is the one that has been around forever and is what 95%
of us run. The un-Restricted version only came out with the release of CUCM 7.1(5)
and it contains many changes to encryption that allows it to be shipped/installed in certain
countries around the world where it was previously not allowed.
Cheers!
Rob