List of valid Certificate Authorities (CAs) on TLS SIP trunk

Hello,

I'm newbie in the community and this message may be missplaced (appologies in advance!)

We're working to settle a SIP TLS trunk from our infraestructure with Zoom but couldn't find a list of valid Certificate Authorities (CAs) and this is a requierement as trunk will use TLS

Is this reference available?

Thank you very much.

Regards