Through effective collaboration and administration, our mission is to ensure the successful implementation of the STIR/SHAKEN governance framework in Canada

Our Mandate

The Canadian Secure Token – Governance Authority (CST-GA) has been established by a group of Canadian telecommunications carriers, in response to CRTC Compliance and Enforcement Decision 2019-403. The CST-GA will develop policies and support industry protocols and operational procedures, designed to authenticate telephone calls and mitigate spoofing and illegal robocalling, generally referred to as STIR/SHAKEN.

The CST-GA will select and direct a Policy Administrator and Certificate Authority to enable STIR/SHAKEN. To participate in this regime please contact us today.

Who is CST-GA?

Bell Canada, Rogers Communications, SaskTel, Shaw Communications, Telus and Vidéotron are among the Founding members of the CSTGA. The Founding members are supported by Jacques Sarrazin, President and Marian Hearn, Executive Director.

See our members


STIR (Secure Telephony Information Revisited) is a technical standard that provides a means for call-originating TSPs to certify the identity of callers, thus enabling the caller’s identity to be validated. In conjunction with STIR, the Alliance for Telecommunications Industry Solutions (ATIS) has developed a framework, referred to as SHAKEN (Signature-based Handling of Asserted information using toKENs) for the implementation of STIR in IP-based service providers’ networks.

Under the STIR/SHAKEN framework, TSPs certify the extent to which a given caller’s identity can be trusted. This information is transmitted using a “digital signature” and is used by the called party, or their TSP, to verify the authenticity of the caller ID (i.e. to determine the extent to which the caller ID can be trusted). This process is dependent upon one or more Certificate Authorities (CAs) administering and issuing certificates to TSPs used to “sign” and “verify” the caller information. To learn more about STIR/SHAKEN, please visit our resources section.


Become a Member

Any Canadian Carrier, with a current year DCS and direct access to Canadian Telephone Numbers can participate in the call authentication scheme.

Become a Certification Authority

Submit your Certificate Practice Statement (CPS) today and start the process to becoming an authorized Certification Authority.