Siemens Gigaset DX800A User Manual page 176

R
RAM
Random Access Memory
Memory in which you have reading and stor-
age rights. Items such as melodies and logos
are saved in the RAM after you have loaded
them onto the phone via the Web configura-
tor.
Registrar
The registrar manages the
scribers' current IP addresses. When you
register with your VoIP provider, your cur-
rent 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 party does not reply 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 called back.
This feature must be supported by the
exchange. The ringback request is automati-
cally cancelled after about two hours
(depending on the network provider).
Ringback when the number is busy
= CCBS (Completion of calls to busy sub-
scriber). If a caller hears the busy tone, he
or she can activate the ringback function.
As soon as the connection is free, the caller is
called back. As soon as the caller lifts the
receiver, the connection is made automati-
cally.
ROM
Read Only Memory
A type of memory that can only be read.
Router
Routes data packets within a network and
between different networks via the quickest
route. Can connect Ethernet
WLAN. Can be a Gateway
Network sub-
networks and
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 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.
Glossary
Network sub-
and
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