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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 Consultation call or Toggling. The waiting par-
ticipant 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 provider to use an Out-
bound 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 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 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
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).
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