User Guide

163

Glossary

Gigaset A510IP / USA en / A31008-M2230-R301-2-6019 / Glossary.fm / 09.10.2012

Version 4, 16.09.2005

Music on hold

Music that is played while you are on a Consultation call or during Call swapping. The waiting

participant hears music while on hold.

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 pri-

vate 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 structure:

–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.

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 servers. They control data traffic through the firewall.

Outbound proxy and STUN servers should not be used simultaneously.