# What is STIR/SHAKEN?

> STIR/SHAKEN is a framework of IETF and ATIS standards that cryptographically signs the calling number on a VoIP call so terminating carriers can verify the caller ID has not been spoofed. STIR (Secure Telephone Identity Revisited) defines the signed PASSporT token; SHAKEN (Signature-based Handling of Asserted information using toKENs) defines how carriers apply it. It is mandated for US and Canadian carriers to fight illegal caller-ID spoofing and robocalls. See /answers/what-is-cli and /answers/what-is-sender-id-spoofing.

- Canonical URL: https://www.broadnet.me/answers/what-is-stir-shaken
- Language: en
- Last reviewed: 2026-07-22
- Publisher: BroadNet (https://www.broadnet.me)

## Related

- [All answers](https://www.broadnet.me/answers)
- [Glossary](https://www.broadnet.me/answers)
- [What is CLI (Calling Line Identification)?](https://www.broadnet.me/answers/what-is-cli)
- [What is ANI (Automatic Number Identification)?](https://www.broadnet.me/answers/what-is-ani)
- [What is sender ID spoofing?](https://www.broadnet.me/answers/what-is-sender-id-spoofing)
- [How does programmable voice work?](https://www.broadnet.me/answers/programmable-voice)
- [Voice](https://www.broadnet.me/products/voice)
- [Compliance](https://www.broadnet.me/compliance)