Glossary Nur für den internen Gebrauch
A31003-S2030-M100-11-76A9, 01/2015
406 OpenStage SIP V3R3 for OpenScape Voice, Administration Manual
bkglos.fm
S
SDP
Session Description Protocol. Describes and initiates multimedia sessions, like web con-
ferences. The informations provided by SDP can be processed by ->SIP.
SIP
Session Initiation Protocol. Signaling protocol for initialising and controlling sessions, used
e. g. for ->VoIP calls.
SNMP
Simple Network Management Protocol. Used for monitoring, controlling, and administra-
tion of network and network devices.
SNTP
Simple Network Time Protocol. Used to synchronize the time of a terminal device with a
timeserver.
Subnet Mask
To discern the network part from the host part of an ->IP address, a device performs an
AND operation on the IP address and the network mask. The network classes A, B, and C
each have a subnet mask that demasks the relevant bits: 255.0.0.0 for Class A,
255.255.0.0 for Class B and 255.255.255.0 for Class C. In a Class C network, for instance,
254 IP addresses are available.
Switch
Network device that connects multiple network segments and terminal devices. The for-
warding of data packets is based on ->MAC Addresses: data targeted to a specific device
is directed to the switch port that device is attached to.
T
TCP
Transfer Control Protocol. The protocol belongs to the transport layer and establishes a
connection between two entities on the application layer. It guarantees reliable and in-or-
der delivery of data from sender to receiver, as opposed to ->UDP.
TLS
Transport Layer Security. Ensures privacy between communicating applications. Typically,
the server is authenticated, but mutual authentication is also possible.
U
UDP
User Datagram Protocol. A minimal message-oriented transport layer protocol used espe-
cially in streaming media applications such as ->VoIP. Reliability and order of packet de-
livery are not guaranteed, as opposed to ->TCP, but ->UDP is faster and more efficient.
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