Alpha Technologies IPBELLv2-01 User Manual page 7

Sip, voip door entry system
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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
space
into another by modifying
Protocol
(IP)
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"
User manual
IPBELLv2
-
datagram
packet headers while they are in transit across a
network address
information in
address
Internet
7

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