Where can I find the Secure SIP encryption details for v16? I'm looking for the level of encryption used, TLS versions etc (not necessarily how to configure Secure SIP).
Ok let me rephrase that. Secure SIP as it is currently implemented is deprecated. 3CX is going to re-do the SIP TLS at some point in v16 and automate most of it for those using 3CX FQDN (my assumption). As far as the level and TLS versions, I imagine you can simply follow the guide to configure and then wireshark to see the TLS handshake.
Yeah it would but if they don't have it by now, I don't think they are going to bother since they are revamping it. I think Update 1 is primarily focused on bug fixes and CFD so maybe Update 2 or Update 3.