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Glossary
S
Server
Makes a service available to other net-
work subscribers (clients). The term
can indicate a computer/PC or an appli-
cation. A server is addressed via the IP
address/domain name and port.
Silence Suppression
Voice quality parameter. If you sup-
press silence, no bandwidth is occupied
during breaks in the conversation.
SIP (Session Initiation Protocol)
Signalling protocol independent of
voice communication. Used for estab-
lishing and ending a call. It is also pos-
sible to define parameters for voice
transmission.
SIP Address
See URI.
SIP Port (Local SIP Port)
(Local) port via which SIP data is
exchanged.
SIP Provider
An SIP or gateway provider is an Inter-
net service provider that provides a
gateway for Internet telephony. As the
handset works with the SIP standard,
your provider must support the SIP
standard.
The provider routes calls from VoIP to
the telephone network (analogue,
ISDN and mobile radio) and vice versa.
SIP Proxy Server
IP address of your SIP provider's gate-
way server. You can also configure an
Outbound Proxy.
SMTP (Simple Mail Transfer Protocol)
Governs the exchange of electronic
mail. Your Internet provider gives you
access to an SMTP server.
SNTP Server (Simple Network Time Protocol)
Server on which the SNTP protocol
runs. The protocol synchronises net-
work subscribers' clocks.
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SSID (Service Set Identifier)
Network name. Identifies the subscrib-
ers to a wireless network (WLAN). The
SSID can be freely selected, but it must
be the same for all the subscribers in a
WLAN.
Static IP address
A static IP address is assigned to a net-
work component manually during net-
work configuration. Unlike a dynamic
IP address, a static IP address never
changes.
See also IP Address.
Streaming
Streaming refers to the real time trans-
fer of multimedia data via a network
connection. The data is not stored in
the device used to play it but is down-
loaded at the time of playing. This
allows real time transfer, for example
for the receipt of Internet radio.
Streaming requires a continuous data
flow; the server on which the files are
located must continuously send the
data to the client.
STUN (Simple Transversal of UDP over NAT)
NAT control mechanism.
STUN is a data protocol for VoIP tele-
phones. STUN replaces the private IP
address in the data packets of the VoIP
telephone 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 by symmetric NATs.
See also: ALG, Firewall, NAT, Outbound
Proxy.
Subnet
Segment of a network.
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