a) Complex: Install thirdparty certs in your CUCM/CUPS servers, those certs should be issued by a Certificate Authority which root certificate is already part of your Truststore in Mobile client (Example: Verisign, Godaddy, etc.)
This process in CUCM/CUPS has been there for a while, you can look up how to install third party certs for CUCM/CUPS. Process is very straight forward, you generate a CSR (Tomcat), provide the CSR to your CA and then obtain the new cert, once you have the new cert, import it to your CUCM. The CA must be a trusted one by your clients (Example: Verisign, Godaddy, etc)
b) Simple: Import those default Tomcat CUCM/CUP self-signed certificates into your Desktops/Mobile clients trust store.
c) Annoying: Educate users to select Accept certificates
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