Siemens Gigaset A580 IP User Manual page 185

Glossary
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 net-
work at a time.
Music on hold
Music on hold
Music that is played while you are on a
The waiting participant hears music while on hold.
N
NAT
Network Address Translation
Method for converting (private)
addresses. NAT enables the IP addresses of
ephones) in a
on the Internet.
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)
VoIP provider to use an
If an outbound proxy is made available you must allow for this in the VoIP set-
tings 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:
u
Range: local networks (LAN) or wide-area networks (WAN)
u
Structure:
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 envi-
ronments as an alternative to
through the firewall.
Outbound proxy and STUN servers should not be used simultaneously.
£
STUN
184
LAN to be concealed behind a shared IP address for the
ALG in the router,
Outbound
Infrastructure network
and NAT.
Consultation call
IP addresses to one or more (public) IP
Network subscribers
STUN in the VoIP telephone, or for the
proxy.
or ad-hoc network
SIP proxy server. They control data traffic
or for Toggling.
(e.g. VoIP tel-
Router