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Yes, as someone who has done volunteer telemarketing, we mark the call status. For example if you’re angry/rude, non-English speaking, disconnected, etc. Campaign managers can then target call sheets accordingly (e.g. for a Spanish-speaking line, have the Spanish team do a follow up call).

That’s really cool to find out. Thank you.

I can't help but think it's funny that scammers may have their own do-not-call list.

I ported my number to a voip service and set up an IVR that forces callers to press a number. I've gotten exactly one spam call in the roughly one year since I did that.

I do the same. Mostly they just hang up. Sometimes they start threatening to take possession of the real estate I don't own.

That also works collectively by clogging up their lines and costing them more in connection fees.

bold assumption that the scammers aren't using compromised pbx systems.