Can I have a silent ringtone for hangup calls?

I get an exasperating number of hangup calls. If I block them, I take the risk that I may block a legitimate caller. I do not want legitimate callers to hear either of the two falsehoods that are offered for calls from blocked numbers. I have previously pleaded for a blocking option that could be quickly invoked with a few taps.

If that is not going to happen, I would like to be able to quickly assign a silent ringtone to the offending number.

The noise is disruptive. The need to check email two minutes later to see if the suspicious call was a hangup is an interruption. I am tired of being yanked off-task.