Definitive H.323 for engineers
5.0(3)Network management technologies
5.0(3)CWISA Wireless IoT Solutions Administrator
5.0(3)Definitive SIP in the IMS for engineers
5.0(3)Total BGP for engineers
5.0(3)Debian system administration
5.0(3)CentOS system administration
5.0(3)Suse system administration
5.0(3)