Siemens Gigaset S675IP User Manual page 148

R
RAM
Random Access Memory
Memory in which you have reading and
storage rights. Items such as melodies
and screen pictures are saved in the
RAM after you have loaded them onto
the phone via the Web configurator.
Registrar
The registrar manages the Network
subscribers' current IP addresses.
When you register with your VoIP pro-
vider, your current IP address is saved
on the registrar. This means you can
also be reached when on the move.
Ringback when the call is not answered
= CCNR (Completion of Calls on No
Reply). If a called party 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
networks and WLAN. Can be a Gate-
way to the Internet.
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 con-
nects the individual networks to this
global system.
A router is a part of this system; it trans-
fers data packets both within a local
network and from one network to the
next. Transfer of data from one net-
work 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 that is used to send and
receive voice data packets for VoIP.
S
Server
Provides a service to other Network
subscribers (Clients). The term can
indicate a computer/PC or an applica-
tion. A server is addressed via IP
address/Domain namen 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 which is used to send and
receive SIP signalling data for VoIP.
SIP provider
See VoIP provider.
Glossary
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