Gigaset N300IP User Manual page 166

Routing
Routing is the transfer of data packets to
another subscriber in your network. On their
way to the recipient, the data packets are
sent from one router to the next until they
reach their destination.
If data packets were not forwarded in this
way, a network like the Internet would not
be possible. Routing connects the individual
networks to this global system.
A router is a part of this system; it transfers
data packets both within a local network
and from one network to the next. Transfer
of data from one network to another is per-
formed on the basis of a common protocol.
RTP
Real-Time Transport Protocol
Global standard for transferring audio and
video data. Often used in conjunction with
UDP. In this case, RTP packets are embedded
in UDP packets.
RTP port
(Local) Port that is used to send and receive
voice data packets for VoIP.
S
Server
Provides a service to other
scribers (Clients). The term can indicate a
computer/PC or an application. A server is
addressed via IP address/Domain name
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.
Network sub-
and
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 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,
proxy.
Subnet
Segment of a Network.
Subnet mask
IP addresses consist of a fixed line number
and a variable subscriber number. The net-
work number is identical for all
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 net-
work number and the last part is the sub-
scriber 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 trans-
mission protocol: it sets up, monitors and
terminates a connection between sender
and recipient for transporting data.
Glossary
Outbound
Network
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