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From what I can tell, the telcos are implementing it, or at least say they are:

* "Caller Verified is T-Mobile’s implementation of the STIR and SHAKEN standards" [0]

* "Verizon reiterates both our commitment to deploying the STIR/SHAKEN call authentication technology" [1]

* "Sprint supports efforts to build the SHAKEN/STIR call authentication system" [2]

* AT&T doesn't seem to mention STIR or SHAKEN by name on their robocall page [3] but the FCC sent them a letter thanking them for their "commitment to implement a robust call authentication framework in 2019" [4]

* "Comcast is proud to be at the forefront of efforts to address the scourge of illegal spoofed robocalls in this country, including the development of the end-to-end call authentication protocol known as SHAKEN and STIR" [5]

etc

[0]: https://www.t-mobile.com/news/caller-verified-note9

[1]: https://ecfsapi.fcc.gov/file/1119062987519/2018%2011%2019%20...

[2]: https://ecfsapi.fcc.gov/file/1091391175368/Sprint%20Call%20A...

[3]: https://about.att.com/sites/cyberaware/ae/robocall

[4]: https://docs.fcc.gov/public/attachments/DOC-354933A2.pdf

[5]: https://ecfsapi.fcc.gov/file/111974588343/Comcast%20Resp%20t...




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