Siemens Gigaset C470 IP User Manual page 174

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.
Glossary
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