Most of the certificates used in CUCM after a fresh installation are self-signed certificates issued, by default, for five years. Note that the five-year time range currently cannot be modified to be a shorter range of time on CUCM. However, a Certificate Authority (CA) can issue certificates for nearly any range of time.
There are also some trusted certificates (such as CAPF-trust and CallManager-trust) that are preloaded and have a longer validity period. For example, the Manufacturing CA certificate is provided on CUCM trust stores to specific features and does not expire until the year 2029.
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