Gigaset A510IP Manual page 168

Glossary
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
See Fixed IP address.
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 tel-
ephone 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 sym-
metric NATs.
See also: ALG, Firewall, NAT,
Subnet
Segment of a Network.
Subnet mask
IP addresses consist of a fixed network number and a variable subscriber number. The network
number is identical for all
mined 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.
TLS
Transport Layer Security
Protocol for encrypting data transmissions on the Internet. TLS is a superordinate
protocol.
Transmission rate
Speed at which data is transmitted in the
units per unit of time (Mbit/s).
166
Outbound proxy.
s
Network subscriber
WAN or LAN. The transmission rate is measured in data
. The size of the network number part is deter-
Transport