Are you a Canadian carrier? Complete the form to see if you are eligible to join the CST-GA.


Any Canadian Carrier with direct access to Canadian Telephone Numbers can participate in the call authentication scheme. For more information, please contact us.

Am I eligible to join the CST-GA?

Please complete the form below to find out if you are eligible to become a member of the CST-GA. Required*


Contact Us

If you have a question or would like to learn more information about the CST-GA , please do not hesitate to reach out.