Comment by luma

Currently, STIR/SHAKEN is only required for VOIP and intermediate carriers but a lot of carriers have implemented or are in progress. Here's a recent report from the GSMA: https://www.gsma.com/get-involved/gsma-membership/gsma_resou...

> Signed traffic between Tier-1 carriers increased to 85% in 2023

We're getting there, just not soon enough. The whole world will have transitioned to never answering their phone before this actually is fully enforced.