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VoIP – Asterisk(FreePBX, Elastix), CUCM/CUCME, Routers – Cisco 2900/3900/etc Switch – Cisco 2960/3750/etc, Dlink, HP, AT Firewall – Cisco ASA, CheckPoint Wireless – Mikrotik, Motorola Canopy, etc OS – Linux/FreeBSD PL – C,Perl,Bash,... DBMS – MySQL,PostgreSQL