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A comment on T-Mobile says it blocked 21B scam calls this year. Parent comment

Re:T-Mobile says it blocked 21B scam calls this year by LostJourneyman on Tuesday December 21, 2021 @10:17AM (#29638147)
This is a call from Memphis TN with a badly formatted ANI. The format that you would recognize would be +19011700119 or (901) 170-0119. 111 or 011 are country code prefixes in the North American Dialing Plan. The "V" may mean verified (which would be an artifact of STIR/SHAKEN, ironically), if you're using XFinity/Comcast... but likely is just an artifact of a bug in the code used to set the headers. The fact that the 901 is prefixed with a 0 hints that the PBX/SBC used to place this call was configured for international use and they missed some localization settings, which could be the culprit for the weird formatting.
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Re:T-Mobile says it blocked 21B scam calls this year by ipython on Tuesday December 21, 2021 @10:23AM (#29638204)
This is fascinating, thanks for sharing. I noticed that I get a lot of spam calls from “Russia” (country code 7) because my local number is in an area code that starts with 7. I figured that the caller totally screwed up their caller ID. I find it hilarious that the callers are trying and failing to appear as if they are in my local area.
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Re:T-Mobile says it blocked 21B scam calls this year by woofcat on Tuesday December 21, 2021 @04:41PM (#29642442)
This is really interesting to me. I've basically just silenced all those calls and my life is much better for it. Interesting that they're in theory passing STIR/SHAKEN.
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