• Internet is worldwide system of mutually connected PC networks
• Intranet is PC network similiar to internet but it is „private“. It is designed jsut
for small group of subscribers (for example workers in some company)
• PoE (Power over Ethernet) is powering via data network cable.
• NTP (Network Time Protocol) is protocol for synchronization of internal PC
clocks
• NAT (Network address translation) is a method of remapping one IP address
space into another by modifying network address information in Internet
Protocol (IP) datagram packet headers while they are in transit across a
traffic routing device
• STUN (Session Traversal Utilities for NAT) is a standardized set of methods
and a network protocol to allow an end host to discover its public IP address if
it is located behind a NAT.
• SIP User Agent - every SIP user agent (phone, software, device) identifies
itself with a string. The syntax of this string is not defined, but a common
practise is „device name + version“
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