STIR (Secure Telephony Identity Revisited) and SHAKEN (Secure Handling of Asserted information using toKENs) refers to techniques utilized via cryptography to ensure that numbers associated with a telephone call are secure. This was put into effect by the telecom industry in an effort to stop robocalls and spoofed numbers.
STIR is part of the Internet Engineering Task Force who’s mission is to better the internets performance. This is done by producing top quality technical documents which influence managers and designers of the internet itself.
SHAKEN works with service providers to supply guidance on operating techniques to validate legitimate calls and eliminate spoofed numbers.