Siemens Gigaset S450 IP User Manual page 131

Glossary
T
TCP
Transmission Control Protocol
Transport protocol. Session-based
transmission protocol: it sets up, moni-
tors and terminates a connection
between sender and recipient for trans-
porting data.
TLS
Transport Layer Security
Protocol for encrypting data transmis-
sions on the Internet. TLS is a superor-
dinated 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 listen in.
Transmission rate
Speed at which data is transmitted in
the WAN or LAN. The transmission rate
is measured in data units per unit of
time (Mbit/s).
Transport protocol
Controls data transport between com-
munication partners (applications).
See also: UDP, TCP, TLS.
U
UDP
User Datagram Protocol
Transport protocol. Unlike TCP, UDP is
a non session-based protocol. It does
not establish a fixed connection. The
data packets (datagrams) are sent as
broadcast. The recipient is solely
responsible for making sure the data is
received. The sender is not notified
about whether it is received.
URI
Uniform Resource Identifier
Character string used to identify
resources (e.g. e-mail recipient,
http://siemens.com, files).
On the Internet URIs are used as a uni-
form identification for resources. URIs
are also described as an SIP address.
130
URIs can be entered in the phone as a
number. By dialling a URI you can call
an Internet subscriber with VoIP equip-
ment.
URL
Universal Resource Locator
Globally unique address of a Domain
on the Internet.
A URL is a subtype of URI. URLs identify
a resource by its location in the Inter-
net. For historical reasons the term is
often used as a synonym for URI.
User ID
See User identification.
User identification
Name/number combination for access
e.g. to your VoIP account.
V
Voice codec
See Codec.
VoIP
Voice over Internet Protocol
Telephone calls are no longer placed
and transmitted over the telephone
network but over the Internet (or other
IP networks).
VoIP provider
A VoIP, SIP or Gateway Provider is an
Internet service provider that provides
a Gateway for Internet telephony. As
the phone works with the SIP standard,
your provider must support the SIP
standard.
The provider routes calls from VoIP to
the telephone network (analogue,
ISDN and mobile radio) and vice versa.
W
WAN
Wide Area Network
Wide-area network that is unrestricted
in terms of area (e.g. Internet).