The FCC issued a report on this very subject[1]. TLDR, there have been four exceptions to the SHAKEN/STIR requirements:
- Providers that can't afford it implement it
- Non-IP networks
- Small voice service providers that originate calls via satellite using U.S. NANP
- Providers that lack control over the network infrastructure necessary to implement
Nothing is going to change as long as those holes exist.
- Providers that can't afford it implement it - Non-IP networks - Small voice service providers that originate calls via satellite using U.S. NANP - Providers that lack control over the network infrastructure necessary to implement
Nothing is going to change as long as those holes exist.
1: https://docs.fcc.gov/public/attachments/DOC-416732A1.pdf