Specifications

128
Glossary
Gigaset SL75 WLAN / en / A31008-M700-B112-1-7619 / glossary.fm / 24.4.06
Version05.08.2005
Buddy
Subscriber with whom you exchange
brief messages on the Internet in real
time (chatting).
See also: Instant Messaging.
C
Call forwarding CF
Automatic redirecting of a call to a dif-
ferent telephone number. There are
three kinds of call forwarding:
– CFU, Call Forwarding Unconditional
– CFB, Call Forwarding Busy
– CFNR, Call Forwarding No Reply
Call waiting
= CW (Call Waiting). Feature provided
by the SIP provider. An acoustic signal
during a call indicates that another
caller is waiting. You can accept or
reject the second call. You can activate/
deactivate the feature.
Certificate
File in which all the necessary informa-
tion for identifying a user is stored. You
require a certificate for authentication
with the TLS security protocol. You can
import certificates into your handset
via the Web configurator.
CF (Call Forwarding)
See Call Forwarding
Channel
See Radio Channel.
Chatting
Form of communication on the Inter-
net. During a chat, brief messages are
exchanged between the communicat-
ing 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
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 – dig-
ital data when voice packets are
received. There are different codecs,
with differing degrees of compression,
for instance.
Both sides of a VoIP connection (caller/
sender side and recipient side) 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 bandwidth 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.
CW (Call Waiting)
See Call Waiting