Dear Maintainer, To add, this root CA is also used in Apple's APNS (Push) endpoints. With the update, systems are not able to connect anymore to this service to deliver notifications to iOS and macOS devices.
Regards, Team 3CX -- Regards, Nick Digalakis Quality Assurance & Community Manager Phone:+1 813-591-0141 *www.3CX.com <http://www.3cx.com/>* <https://www.facebook.com/3CX> <https://www.facebook.com/3CX> <https://twitter.com/3CX> <https://twitter.com/3CX> <https://twitter.com/3CX> <https://www.linkedin.com/company/3cx> <https://www.linkedin.com/company/3cx> <https://www.linkedin.com/company/3cx>