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R
RAM
Random Access Memory
Memory in which you have reading and storage rights. Such items asmelodies and
screen pictures are stored in the RAM after being loaded into the phone via the Web con-
figurator.
Registrar
The registrar manages the current IP addresses of Network subscribers. When you reg-
ister with your VoIP provider, 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 reply). If a participant does not respond when called, a
caller can arrange an automatic ringback. As soon as the destination phone has com-
pleted a call and is free again the caller is rung back. This feature must be supported by
the exchange. The ringback 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 ringback function. As soon as the connection is free the caller is
rung back. As soon as the caller lifts his receiver the connection is made automatically.
RJ45 modular jack
Eight-pole (8P8C) modular jack. RJ stands for Registered Jack (standardised socket).
RJ45 is used for ISDN connection sockets and cables, structured wiring and computer
networks.
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 Gateway 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 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 transmits data packets both within a local network
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 conjunction with
UDP. In this case, RTP packets are embedded in UDP packets.
RTP port
(Local) Port which is used to send and receive voice data packets for VoIP.
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