The following Canadian telecommunications companies are members of the CST-GA:
Eligibility
Become a Member
Any Canadian Carrier with direct access to Canadian Telephone Numbers can participate in the call authentication scheme.

Our members are shareholders of the CST-GA – they are Canadian carriers helping to restore trust in telecommunications.
The following Canadian telecommunications companies are members of the CST-GA:
Any Canadian Carrier with direct access to Canadian Telephone Numbers can participate in the call authentication scheme.
Whether you are a Canadian carrier interested in joining the CST-GA or simply would like to learn more, we want to hear from you.