this post was submitted on 25 Oct 2023
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It's part of Rich Call Data, which is an extension to the STIR/SHAKEN token to add more details about the caller.
It requires that the data make it entirely across the network all the way to the endpoint, and that the endpoint cares to listen to it. As far as I am aware it basically only works by default on certain Samsung phones and can be added by an app to some other Android devices. I have not seen any evidence of Apple devices ever supporting it.
AFAIK you need a special certificate as well that of course costs a lot more than the normal SHAKEN/STIR stuff.