Thank you for updating the install steps, but I seem to be failing on the second page due to missing packages.
Epel repository is installed, but the following packages are missing libssl-devel, libzrtpcpp-devel and lua-sql-postgresql.
libssl-devel was replaced with openssl-devel back in centos 6, which makes me wonder if this was just a mistake on the steps, or have the steps not been tested at all and the previous broken centos 6 install steps amended but not checked?
I cant find libzrtpcpp-devel or lua-sql-postgresql for Centos 7, should they be in the EPEL and Postgresql Repositories?