How to Install Asterisk on CentOS 7
https://www.linode.com/docs/applications/voip/install-asterisk-on-centos-7/ https://www.tecmint.com/install-asterisk-on-centos-7/
source
https://www.linode.com/docs/applications/voip/install-asterisk-on-centos-7/ https://www.tecmint.com/install-asterisk-on-centos-7/
source