183
Glossary
Gigaset A580 IP / US English / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 28.04.2009
Ve
rs
ion 8,
03
.09
.200
8
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
. Session-based transmission protocol: it sets up, monitors
and terminates a connection between sender and recipient for transporting
data.
TLS
Transport Layer Security
Protocol for encrypting data transmissions on the Internet. TLS is a superordi-
nated
.
Toggling
Toggling allows you to switch between two callers or between a conference call
and an individual caller without allowing the waiting caller to listen to the call.
Transmission rate
Speed at which data is transmitted in the
or
. The transmission rate
is measured in data units per unit of time (Mbit/s).
Transport protocol
Controls data transport between two communication partners (applications).
£
U
UDP
User Datagram Protocol
is a non session-based protocol. UDP
does not establish a fixed connection. The data packets ("datagrams") are sent
as a broadcast. The recipient is solely responsible for making sure the data is
received. The sender is not notified about whether it is received or not.
URI
Uniform Resource Identifier
Character sequence for identifying resources (e.g. e-mail recipient, http://
gigaset.com, files).
On the
, URIs are used as a uniform identification for resources. URIs
are also described as SIP addresses.
URIs can be entered in the phone as a number. By dialing a URI you can call an
Internet subscriber with VoIP equipment.
URL
Universal Resource Locator
Globally unique address of a domain on the
.
A URL is a subtype of
. URLs identify a resource by its location on the
. For historical reasons the term is often used as a synonym for URI.
User ID
£
User identification
.