Siemens Gigaset DE380 IP R - Manual (Page 82)

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Glossary
N
NAT
Network Address Translation
Method for converting (private) IP address to one or more (public)
IP addresses. NAT enables the IP addresses of Network subscribers
(e.g., VoIP telephones) in a LAN to be concealed behind a shared IP address
for the Router on the Internet.
VoIP telephones behind a NAT router cannot be reached by VoIP servers
(because of the private IP address). In order to "get around" NAT, it is possible
to use (alternatively) ALG in the router, STUN in the VoIP telephone, or for
the VoIP provider to use an Outbound proxy.
If an outbound proxy is made available you must allow for this in the
VoIP settings for your phone.
Network
Group of devices. Devices can be connected in either wired or wireless
mode.
Networks can also differ in range and structure:
– Range: local networks (LAN) or wide area networks (WAN)
– Structure: Infrastructure network or ad-hoc network
Network subscribers
Devices and PCs that are connected to each other in a network, e.g., servers,
PCs and phones.
O
Outbound proxy
Alternative NAT control mechanism to STUN and ALG.
Outbound proxies are implemented by the VoIP provider in firewall/NAT
environments as an alternative to SIP proxy server. They control data traffic
through the firewall.
Outbound proxy and STUN servers should not be used simultaneously.
See also: STUNand NAT.
P
PIN
Personal Identification Number
Protects against unauthorized use. When the PIN is activated, a number
combination has to be entered in order to access a protected area.
Port
Data is exchanged between two applications in a Network via a port.
Port Forwarding
The Internet gateway (e.g., your router) forwards data packets from the
Internet that are directed to a certain Port to the port concerned.
This allows servers in the LAN to offer services on the Internet without you
needing a public IP address.