Gigaset C450 IP Manual page 97

Glossary
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. Email recipient, http://
siemens.com, files).
On the Internet URIs are used as a
unique 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 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) on the Inter-
net. For historical reasons the term is
often used as a synonym for URI.
User ID
See User recognition.
User recognition
Name/number combination for access
e.g. to your VoIP account.
96
V
Voice codec
See Codec.
VoIP
Voice over Internet Protocol
Calls are no longer established and
transmitted via the telephone network,
but via the Internet (or other IP net-
works).
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).