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CE 450 IP R / IM-Ost english / A31008-M1817-R601_1-7619 / glossary.fm / 02.03.2007
Ve
rs
ion 2,
21
.12.
2006
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 that is played while you are on a
. The waiting par-
ticipant hears music while on hold.
N
NAT
Network Address Translation
Method for converting (private)
to one or more (public) IP addresses.
NAT enables the IP addresses of
(e.g. VoIP telephones) in a
to be concealed behind a shared IP address for the
on the
.
VoIP telephones behind a NAT router cannot be reached by VoIP servers (on account of
the private IP address). In order to "get around" NAT, it is possible to use (alternatively)
in the VoIP telephone, or for the VoIP provider to use an
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 (
) or wide-area networks (
)
– Structure:
or ad-hoc network
Network subscribers
Devices and computers 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
. They control data traffic through the firewall.
Outbound proxy and STUN servers should not be used simultaneously.
See also:
.
P
PIN
Personal Identification Number
Protects against unauthorised use. When the PIN is activated a number combination has
to be entered in order to access a protected area.
You can protect your base station configuration data with a system PIN (4-digit number
combination).
