Siemens Gigaset C450IP Owner's Manual page 94

Ringback when the call is not answered
= CCNR (Completion of Calls on No
Reply). If a participant does not
respond when called, a caller can
arrange an automatic ringback. As
soon as the destination phone has
completed a call and is free again the
caller is rung back. This feature must be
supported by the exchange. The ring-
back request is automatically cancelled
after about 2 hours (depending on the
VoIP provider).
Ringback when the number is busy
= CCBS (Completion of Calls to Busy
Subscriber). If a caller hears the busy
tone, he or she can activate the ring-
back function. As soon as the connec-
tion is free the caller is rung back. As
soon as the caller lifts his receiver the
connection is made automatically.
ROM
Read Only Memory
A type of memory that can only be
read, as opposed to RAM which can be
both read and written.
Router
Routes data packets within a network
and between different networks via the
quickest route. Can connect Ethernet
network and WLAN. Can be the gate-
way to the Internet.
Routing
Routing is the transmission of data
packets to another subscriber in your
network. On its way to the recipient,
the data packet is sent from one router
to the next until it reaches its destina-
tion.
If data packets were not forwarded in
this way, a network like the Internet
would not be possible. Routing con-
nects the individual network to this glo-
bal system.
A router is a part of this system; it trans-
mits data packets both within a net-
work and from one network to the
next. Transmission of data from one
network to another is performed on the
basis of a common protocol.
RTP
Realtime Transport Protocol
Global standard for transferring audio
and video data. Often used in conjunc-
tion with UDP. In this case, RTP packets
are embedded in UDP packets.
RTP port
(Local) Port by means of which voice
data packets are sent and received for
VoIP.
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.
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 by means of which SIP sig-
nalling data is sent and received for
VoIP.
SIP Provider
See VoIP provider.
SIP Proxy Server
IP address of your VoIP provider's gate-
way server.
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.
Glossary
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