Siemens Gigaset S685 IP Manual page 262

Glossary
Subnet mask
IP addresses
number. The network number is identical for all
of the network number part is determined in the subnet mask. In the subnet
mask 255.255.255.0, for example, 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
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 Transport
Transmission rate
Speed at which data is transmitted in the
is measured in data units per unit of time (Mbit/s).
Transport protocol
Controls data transport between two communication partners (applications).
See also: UDP, TCP, TLS.
U
UDP
User Datagram Protocol
Transport
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 Internet, 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 dialling a URI, you can call an
Internet subscriber with VoIP equipment.
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consist of a fixed network number and a variable subscriber
protocol. Session-based transmission protocol: it sets up, monitors
protocol.
protocol. Unlike TCP,
Network
WAN or LAN. The transmission rate
UDP is a non session-based protocol. UDP
subscribers. The size