STAC
STAC is used to reduce the data volume transmitted (data compres-
sion).
Static IP Address
In contrast to a dynamic IP address, the static IP address is as-
signed permanently by the user. Network components such as the
web server or printer usually have static IP address, while clients
such as notebooks or workstations usually have dynamic IP ad-
dresses.
Station guarding
When station guarding is enabled, acoustic call signalling is
switched off. This function is also known as Do not disturb.
STUN Server
Simple Traversal of User Datagram Protocol (UDP) Through Net-
work Address Translators (NATs). A STUN server enables VoIP
devices behind an active NAT to access the network.
Sub-addressing
As well as the ISDN telephone number, a sub-address can also be
sent when establishing the connection. This sub-address can trans-
mit any additional information. It can be used, e. g., to systematically
address multiple ISDN terminals that can be reached under one
telephone number, or to open particular programs on a PC.
Subnet
A sub-network in an IP network is known as a subnet. A subnet is
defined like a normal network, via an IP address and (sub-)netmask
(IPv4) and prefix length (IPv6). Example: 192.168.1.250/24
(192.168.1.250/255.255.255.0, 256 possible IP addresses) is a sub-
net of 192.168.1.250/16 (192.168.1.250/255.255.0.0, 65536 pos-
sible IP addresses).
Suppress telephone
number
See Display caller number (CLIP / CLIR) and Display called party
number (COLP / COLR).
Switch
A switch is a network component that connects individual network
segments to one another. On the one hand, a switch can be oper-
ated as a bridge to the data link layer in the OSI model. Unlike the
bridge, however, a switch has more than one input and output. On
the other hand, the switch can be operated as a gateway to the net-
work layer in the OSI model. The device comparable to the switch in
the physical layer is known as the hub.
Switch contact
A telephone can be used to switch a device connected to the switch
contact, e. g. a door opener, on and off.
SWYX
SwyxWare is a software-based communication solution for VoIP.
Syslog
The syslog protocol is used to transmit status messages in an IP
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Glossary
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