1) Should I configure sip trunk between CUCM and vcs-control? Because I've seen some documentation which says it is no longer necessary. 2) My software CUCM in unrestricted and not let me use TLS Encryption Key and certain features even so is compatible? 3) It is mandatory to install the certificates?
1) Not required, unless you want to have calls with something registered to the VCS-C
2) CUCM authentication and encryption is separate, and optional, for MRA. MRA will take care of securing the channel between the endpoint and the VCSs, then it will be un-encrypted once in your internal network
3) Not really, but will make your life a lot easier to have them all from a single CA.
If you haven't, I suggest you read the MRA config guide for the version you'll be deploying.
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