You can modify the Ring in many way, upload silent file is the long way out. I've posted few options that you may consider below.Also the link that you may want to keep handy. Cheers!https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/command/r...

Here's few options and flavor that you can work with to silent the ring using CME. SilentRing(s)You can configuresilentring on any type of phone.However, you typicallyset silentring only on buttonsofa phonewith multiplelines,such as a CiscoUnifiedIP ...