While CUCM 8.6.2 is considered a "legacy" version today, it remains a pillar in many stable environments and is a great learning tool for understanding the foundations of Cisco’s Unified Communications Operating System (UCOS).
This procedure assumes you are performing a fresh installation or a complete recovery. Warning: This will erase all existing data. Bootable UCSInstall UCOS UNRST 8.6.2.10000-14.sgn.161
Mira checked the logs. There it was—a buried notice: “Legacy SIP trunk failover test, Nov 15. High risk of toll fraud and dropped 911 calls.” No one else had flagged it. While CUCM 8
To manually verify (on a Linux host), one could use openssl dgst -verify if the public key is extracted, but Cisco does not openly distribute the verification key. Mira checked the logs
: Cisco Unified Communications Manager (CallManager) version 8.6(2). Version : 8.6.2.10000-14 is a specific maintenance release.
: Note that CUCM 8.6 is a legacy version (End of Support as of 2017). For production environments, it is highly recommended to upgrade to a supported version like CUCM 14 or 15