We recently updated our certificates on CUCM 9.1. I ended up having to install new certificates twice. Both times, I updated the certificates without any downtime. I would add that we are using non-secure profiles for our phones.
I ran into a problem that I think other people might be having so I thought I would share the solution.
After installing the certificates and restarting the Cisco Tomcat service, we had too:
Restart the RIS service on the Call Manager
Repair the database replication on all CUCMs
The process of installing certificates is fairly simple:
Login to CUCM OS Administration
Click on Security, Certificate Management
Click on Generate CSR
Tomcat should be selected by default, click on generate
Next, download the CSR.
Submit the CSR to a Certificate Authority and get your certificate
In CUCM OS Administration, certificate management, click on upload certificate
First upload the Root or Intermediate CA certificate as a tomcat-trust certificate
Then upload the certificate for the CUCM.
From the CUCM CLI, restart the Cisco Tomcat services (utils service restart Cisco Tomcat)
Keep in mind that in my installation, I am using non-secure profiles and I did not research how this would affect secure profile installations (CAPF and Device Security Profile on phones).
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