Just got off the line with @FrontierCorp, who told me there's nothing they can do about a constant stream of junk calls. Sure glad I have one of their competitors!
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If you look up the number it belongs to a medical supply company, I would recommend reaching to them because we wouldn't be able to stop a business from calling you. ^GKC
It rings 1 to 3 times then stops ringing. Hopefully I can get my parents moved off this terrible junk-call-plagued landline service soon. Alternatives are said to be expanding into the area.