cPanel doesn't support MSSQL through FreeTDS directly through EasyApache. I wrote an article on how to do this with cPanel quite a few months ago, and I haven't tested it since, but it worked when I wrote it:
If I want to access 2 different mssql servers (1 domain needs access to one server e another domain needs access to another server), did I just add a new "host =" line in "/usr/local/freetds/etc/freetds.conf"