Hardware

• Routers & Switches from Cisco, Cisco SMB and Mikrotik
• Logical and physical illustrations
• Segment / device relationship summary
• VoIP phones from Polycom, Cisco, KIRK - SIP
• Wireless equipment - IEEE 802.11 a/b/g/n 

  Software

• Linux Servers - CentOS, Ubuntu Server
• Asterisk PBX
• Kamailio SIP router
• LAMP
• IP firewalling in general

 Physical Plant 

• ISP evaluation, negotiation, management
• ITSP ecaluation, negotiation, management