Sysadmin Pro VPN with Yealink

I want to use sysadmin pro to create vpn client files for my Yealinks.
There is no option to create the client file for a particular manufacturer. I assume they all require a wide array of different configurations. Is that one size fits them all, or how does this work?
Is Yealink supported?

Also can we modify parameters in the VPN config files to suit our needs?
E.g. with the VPN server we are currently running we had to turn off TLS retry, to avoid 5 second dropouts every hour.