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Siemens GIGASET C475 IP User Manual

Page 191

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190

Glossary

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

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Chatting

Form of communication on the Internet. During a chat, brief messages are exchanged

between the communicating parties in real time. Chatting in this sense is understood to

be a written form of communication.

Client

Application that requests a service from a server.

Codec

Coder/decoder

Codec is a procedure that digitises and compresses analogue voice before it is sent via

the Internet and decodes – i.e.translates into analogue voice – digital data when voice

packets are received. There are different codecs, with differing degrees of compression,

for instance.
Both parties involved in the telephone connection (caller/sender and recipient) must

use the same codec. This is negotiated between the sender and the recipient when

establishing a connection.
The choice of codec is a compromise between voice quality, transmission speed and the

necessary bandwidth. A high level of compression, for example, means that the band-

width required for each voice connection is low. However, it also means that the time

needed to compress/decompress the data is greater, which increases execution time for

data in the network and thus impairs voice quality. The time required increases the delay

between the sender speaking and the recipient hearing what has been said.

COLP / COLR

Connected Line Identification Presentation/Restriction

Service characteristic of a VoIP connection for outgoing calls.
COLP displays the phone number accepting the call on the calling party's display unit.
The number of the party accepting the call is different to the dialled number, e.g. if the

call is forwarded or transferred.
The called party can use COLR (Connected Line Identification Restriction) to prevent the

number from appearing on the calling party's display.

Consultation call

You are on a call. With a consultation call, you interrupt the conversation briefly to

establish a connection to another participant. If you terminate the connection to this

participant immediately, then this is a consultation call. If you switch to and fro between

the first and second participants, it is called Toggling.

CW

Call Waiting

See Call waiting.

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