I get about 3 calls a day from this number, all hours. It does not have a caller id, nor does it say anonymous or unknown. Once it had V81812360700015 for the id. I have answered this call a number of times as it is a local number for me. No one answers and after a minute it hangs up and the phone starts beeping fast. I am also getting calls from a 972-370-3053 with the same issue. I suspect they are related. I suspect this is a scam for a security system or medical alerts as I have gotten a lot of calls around those lately.