Trust in Telecommunications

CST-GA is the national governance authority tasked to direct and oversee the STIR/SHAKEN Policy Administrator and Certificate Authority for Canada.


Ensuring Integrity & Security

Re-establishing Trust

Contributing to the successful implementation of the STIR/SHAKEN framework will allow Canadians to once again answer the phone without apprehension.

A Unified Voice

Bringing together collective agreement will allow for a quicker and more proactive approach for implementing recommendations.

Knowledge. Experience.

The CST-GA’s team has decades of proven leadership and support to the industry – negotiating, building consensus and providing expert business guidance.

See if you are eligible to join


How It Works

STIR (Secure Telephony Information Revisited) is a a technical standard that allows telecommunications service providers to certify the identity of callers. SHAKEN (Signature-based Handling of Asserted information using toKENs) is the framework for the implementation of STIR into providers’ networks. Simply put, STIR defines how you could implement the protocol, while SHAKEN documents how you will implement the protocol.




Update on Application and Onboarding Process for TSPs not eligible to become Shareholders in CST-GA but who wish to acquire an SPC Token (the “Participants”)

Read more

Notice: Consultation to amend CST-GA Policy 001, SPC Token Access Policy

Read more

Restoring Trust in Phone Calls

Read more

Media Coverage

TELUS Hosts CRTC and FCC Exchange to Demonstrate Call Validation Technology

Read more

CRTC Calls on Telecoms to Adopt New Tool to Tackle “Spoofed” Phone Calls

Read more

View all news



TSPs registered with the CRTC to provide voice services in Canada may participate either as a Shareholder or a non-Shareholder Participant.

Become a Certification Authority

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