I have already done the following:
rpm -ivh http://dag.wieers.com/rpm/packages/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
wget http://rpms.famillecollet.com/enterprise/remi.repo
yum install freetds
yum install freetds-devel
yum update
vim /etc/yum.conf <-- retirei os excludes da configuração do yum para fazer a instalação abaixo
yum install --enablerepo=remi php-mssql
But it still does not connect "could not find driver".