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Glossary
Gigaset N720 DECT IP Multicell System / engbt / A31008-M2314-L101-6-7619 / Glossary.fm / 29.08.2016
Version 2, 06.08.2010
S
Server
Provides a service to other Network subscribers (Clients). The term can indicate a
computer/PC or an application. A server is addressed via IP address/Domain name
and Port.
SIP (Session Initiation Protocol)
Signalling protocol independent of voice communication. Used for establishing and
ending a call. It is also possible to define parameters for voice transmission.
SIP address
See URI.
SIP port/Local SIP port
(Local) Port that is used to send and receive SIP signalling data for VoIP.
SIP provider
See VoIP provider.
SIP proxy server
IP address of your VoIP provider's gateway server.
Static IP address
A fixed IP address is assigned to a network component manually during network
configuration. Unlike the Dynamic IP address, a fixed IP address does not change.
STUN
Simple Transversal of UDP over NAT
NAT control mechanism.
STUN is a data protocol for VoIP telephones. STUN replaces the private IP address in the
VoIP telephone data packets with the public address of the secure private network. To
control data transfer, a STUN server is also required on the Internet. STUN cannot be
implemented with symmetric NATs.
See also: ALG, Firewall, NAT, Outbound proxy.
Subnet
Segment of a Network.
Subnet mask
IP addresses consist of a fixed line number and a variable subscriber number. The
network number is identical for all Network subscribers. The size of the network
number part is determined in the subnet mask. In the subnet mask 255.255.255.0, for
example, the first three parts of the IP address are the network number and the last
part is the subscriber number.
Symmetric NAT
A symmetric NAT assigns different external IP addresses and port numbers to the same
internal IP addresses and port numbers – depending on the external target address.
T
TCP
Transmission Control Protocol
Transport protocol. Session-based transmission protocol: it sets up, monitors and
terminates a connection between sender and recipient for transporting data.
