Why does Entrust require a third party phone number source?
When Entrust issues an SSL Certificate to any entity, that certificate leverages the trust of Entrust’s Root Certificate. This Root Certificate is embedded in the internet browsers that clients use to access websites over the internet. By issuing a certificate, Entrust is attesting to the client accessing the site the certificate is installed on that they can trust that the information they submit on that site is being securely transmitted to the legitimate business identified in the certificate.