Download Siemens Gigaset C685 IP User guide

Transcript
Gigaset C610-C610A IP / AUS / A31008-M2312-C401-1-7619 / Glossary.fm / 03.04.12
Glossary
Glossary
A
ADSL
Asymmetric Digital Subscriber Line
Special form of DSL.
ALG
Application Layer Gateway
NAT control mechanism of a router.
Many routers with integrated NAT use ALG.
ALG lets the data packets in a VoIP connection pass and adds the public IP address of
the secure private network.
The router's ALG should be deactivated if the
VoIP provider offers a STUN server or an outbound proxy.
See also: Firewall, NAT, Outbound proxy,
STUN.
Authentication
Restriction of access to a network/service by
using an ID and password to log in.
Automatic ringback
See Ringback when the number is busy.
B
Block dialling
Enter the complete phone number, and correct it if necessary. Then pick up the earpiece
or press the talk/speaker key to dial the
phone number.
Broadband Internet access
See DSL.
C
Call divert
CD
Version 4, 16.09.2005
Automatic diversion (CD) of a call to a different telephone number. There are three kinds
of call divert:
– CDU, Call Divert Unconditional
– CDB, Call Divert Busy
– CDNR, Call Divert No Reply
218
Call swapping
Call swapping allows you to switch between
two callers or between a conference and an
individual caller without allowing the waiting caller to listen to the call.
Call waiting
CW
Network provider feature. A beep during a
call indicates that another caller is waiting.
You can accept or reject the second call. You
can activate/deactivate the feature.
CF
Call Forwarding
See Call divert.
Client
Application that requests a service from a
server.
Codec
Coder/decoder
Codec is a procedure that digitalises 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
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.