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Glossary
Gigaset N300/N300A IP / GBR / A31008-M2214-L101-2-7619 / Glossary.fm / 16.07.13
Version 4, 16.09.2005
MRU
Maximum Receive Unit
Defines the maximum user data volume
within a data packet.
MTU
Maximum Transmission Unit
Defines the maximum length of a data
packet that can be carried over the network
at a time.
Music on hold
Music on hold
Music that is played while you are on a Con-
sultation call or during Call swapping. The
waiting participant hears music while on
hold.
N
NAT
Network Address Translation
Method for converting (private) IP
addresses 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 Routers on the Internet.
VoIP telephones behind a NAT router cannot
be reached by VoIP servers (on account of
the private IP address). To "get around" NAT,
it is possible to use either 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 struc-
ture:
–Range: Local networks (LAN) or wide-
area networks (WAN)
– Structure: Infrastructure network or
ad-hoc network
Network subscriber
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: STUN and NAT.
P
Paging (handset search)
Base function for locating the registered
handsets. The base establishes a connection
to every registered handset. The handsets
start to ring.
PIN
Personal Identification Number
Protects against unauthorised use. When
the PIN is activated, a number combination
has to be entered to access a protected area.
You can protect your base configuration
data with a system PIN (4-digit number com-
bination).
Port
Data is exchanged between two applica-
tions in a Network via a port.
Port forwarding
The Internet gateway (e.g., your router) for-
wards data packets from the Internet that
are directed to a certain Port to the port con-
cerned. This allows servers in the LAN to
offer services on the Internet without you
needing a public IP address.
