Virtualization: ESXI: 5.5-6.7, ProxMox, Docker.

ViciDial/Asterisk: SIP, Trunk, Dialplan, Stats, a2billing, ASTPP

Microsoft Windows Server: AD, GPO, DNS, RDP, Radius.

Mikrotik (ROS): NAT, GRE, L2tp, OSPF, FW, Mangle, Scripts.

Ubuntu Server: LAMP(NAMP), Squid, bind9.

WEB: L(N)AMP, MySQL(MariaDB), PHP, CSS.

Services: Zimbra, Zabbix, Nextcloud, Pritunl, Onlyoffice, Alfresco, Inclient

OutSource exp.: SimplyContact, Binotel, Nextel, Megabilling, IIKO, Rkeeper, B52

Certs: Mikrotik MTCNA (2019).

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