“Some of your DNS only records are exposing IPs that are proxied through Cloudflare. Make sure to proxy all A, AAAA, and CNAME records pointing to proxied records to avoid exposing your origin IP.”
SIP is not HTTP/S traffic, so you can’t fix that. You’re seeing a standard message if you host another service in addition to your website on the same server.
Some people run email and web server on the same server. In that case, the MX record points directly at their web server IP address, and cannot be hidden and protected by Cloudflare. As you are using a service provider for email etc., this is not a problem for you.