Siemens Gigaset A580IP - Page 194

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Glossary
Gigaset A580 IP / GBR / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 24.03.2010
Version 8, 03.09.2008
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 Consultation call or for Toggli ng.
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 Router 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) ALG in the router, STUN in the VoIP telephone, or for the VoIP pro-
vider 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:
u Range: local networks (LAN) or wide-area networks (WAN)
u 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 environ-
ments as an alternative to SIP proxy server. They control data traffic through the
firewall.
Outbound proxy and STUN servers should not be used simultaneously.
£ STUN and NAT.