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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 transmissions 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 listen in.
Transmission rate
Speed at which data is transmitted in the WAN or LAN. The transmission rate is meas-
ured in data units per unit of time (Mbit/s).
Transport protocol
Controls data transport between communication 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 estab-
lish a fixed connection. The data packets (datagrams) are sent as broadcast. The recipi-
ent is solely responsible for making sure the data is received. The sender is not notified
about whether it is received.
UPnP
Universal Plug and Play
Enables spontaneous linking of networks: UPnP-compatible devices carry out the net-
work configuration automatically when they log in to the network. The devices make
services available to the network and use the services of other devices in the network.
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 uniform identification for resources. URIs are also
described as an SIP address.
URIs can be entered in the phone as a number. By dialling a URI you can call an Internet
subscriber with VoIP equipment.
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 on the Internet. For
historical reasons the term is often used as a synonym for URI.
User ID
See User identification.
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