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Glossary
Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 16.8.07
Version 2.1, 08.01.2007
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.
URI
Uniform Resource Identifier
Character sequence for identifying 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 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.
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 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).
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
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