i know at work at tac, not supported, thats not the appropiate way to route packets in a network specifically a high availability server as CUCM, we can do it, but the best way to setup your network so traffic depending source uses different poath like route-maps. You can contact your local SE to push for a feature enhacenment to do that from regular cli.
I understand this is not big deal once we have the access, we do it in our machines everyday but we havent test it or we dont know how this affect your server at all.
We still dont have a command to add routes. This is in fact not supported, you can open a TAC case if its urgent, no problem, but as Justin explained you is not supported and not the best practice for a high availability server as CUCM.
Since we dont know what other behavior may affect the server performance.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.