I'm sure you have sorted this by now, but you only get 90 days to purchase UCSS from when you first purchase your CUCM. You are way past the conversion dates from SASU to UCSS so the answer should be no in this case.
Since you posted this query User Connect Licensing has been released and this is now the preferred Cisco option for upgrades/new purchases ... UCL will be required eventually if you want to upgrade to 7.1.5 or 8.x. If moving from CM 4.x then upgrade via the 3&3 method which (typically) mean $3 per user and 3 years of UCSS at $26/user ... so basically $29/user. The server count is no longer part of the equation, it's down to the number of users.
If you have no UCSS in place, the 3&3 method seems to be typically cheaper than repurchasing the server licenses, although this depends on number of users and cluster size.
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