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Glossary
Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 16.8.07
Version 2.1, 08.01.2007
STUN
Simple Transversal of UDP over NAT
NAT control mechanism.
STUN is a data protocol for VoIP telephones. STUN replaces the private IP address in the
data packets of the VoIP telephone with the public address of the secure private net-
work. To control data transfer, a STUN server is also required on the Internet. STUN can-
not be implemented with symmetric NATs.
See also: ALG, Firewall, NAT, Outbound proxy.
Subnet
Segment of a Network.
Subnet mask
IP addresses consist of a fixed line number and a variable subscriber number. The net-
work number is identical for all Network subscriberss. The proportion of the IP address
made up of the network number is determined in the subnet mask. In the subnet mask
255.255.255.0, for e.g., the first three parts of the IP address are the network number
and the last part the subscriber number.
Symmetric NAT
A symmetric NAT assigns different external IP addresses and port numbers to the same
internal IP addresses and port numbers – depending on the external target address.
T
TCP
Transmission Control Protocol
Transport protocol. Session-based transmission protocol: it sets up, monitors and ter-
minates a connection between sender and recipient for transporting data.
TLS
Transport Layer Security
Protocol for encrypting data transfers on the Internet. TLS is a superordinated Transport
protocol.
Toggling
Toggling allows you to switch between two callers or between a conference call and an
individual caller without allowing the waiting caller to screen the call.
Transfer rate
Speed at which data is transferred in the WAN or LAN. The transfer rate is measured in
data units per unit of time (Mbit/s).
Transport protocol
Controls data transport between communication partners (applications).
See also: UDP, TCP, TLS.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
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