Do download CUCM 12.5 from torrent sites or random file hosts. Cisco images are commonly backdoored with malware. Additionally, running unlicensed Cisco software violates copyright law and can result in legal action from Cisco's BSA team.
This guide covers everything you need to know about locating, downloading, and deploying Cisco CUCM 12.5. Cisco Cucm 12.5 Download
Simply having a contract isn't always enough; your contract must be "entitled" for the specific product. Usually, if you have purchased a CUCM server or a "Top Level" support contract for your collaboration infrastructure, this is included. Do download CUCM 12
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