There’s no official way to disable the voice chat ringing sound in Steam settings. The only option is to either block or unfriend the person. This issue has been around for a while, but Steam hasn’t provided a full solution yet. It’s possible that this sound could be disabled using third-party programs, like Cheat Engine, but it can be risky and may violate Steam’s terms of service. I don’t recommend using such methods, as it could lead to a ban or other issues with your account.