What is STIR and SHAKEN all about?

STIR/SHAKEN (and the associated infrastructure) will lead to a dramatic drop in spam by making the source CallerID of phone calls impossible to fake.

As phone spammers have evolved their methods over the years, they have started spoofing the source of their phone calls, making it look like you are receiving a call from a local number, even if the spammer is not even in the same country!

By forcing spammers to use their real numbers, they will quickly be picked up by spam detection services, and in most cases, automatically blocked as soon as their (un-fakeable!) Caller ID number is reported.