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See ringback when the number is busy, Router – Siemens GIGASET C475 IP User Manual

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198

Glossary

Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / glossary.fm / 18.12.07

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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 regis-

ter 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 No 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.

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 transfer of data packets to another subscriber in your network. On its way

to the recipient, the data packets are 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 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

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 that is used to send and receive voice data packets for VoIP.

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