I just stopped answering any/all unknown phone numbers. Only my contacts get me without leaving a message. I'm sure it's caused me to lose business, but I can't find a better way of maintaining my own productivity/sanity. I do disclose this practice in the outgoing message, and encourage callers to text me if they don't get an answer. Whatever software the robocallers use doesn't seem to be smart enough to clock this as an alternative channel, but I'm sure some AI product will make this worse.
