Gigaset DX800A S30853-H3100-D201 User Manual

Gigaset DX800A all in one / IM-NORD EN / A31008-N3100-R201-2-SM19 / Glossary.fm / 18.04.11

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Asymmetric Digital Subscriber Line

Special form of 

.

Application Layer Gateway

NAT control mechanism of a router. 

Many routers with integrated NAT use ALG. 
ALG lets the data packets in a VoIP connec-
tion 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 out-
bound proxy. 

See also: 

, 

. 

Restriction of access to a network/service by 
using an ID and password to log in. 

See 

Enter the complete phone number, and cor-
rect it if necessary. Then pick up the receiver 
or press the speaker key to dial the phone 
number. 

See 

.

= CD

Automatic diversion (CD) of a call to a differ-
ent telephone number. There are three kinds 
of call divert: 

– CDU, Call Divert Unconditional

– CDB, Call Divert Busy 
– CDNR, Call Divert No Reply

Call swapping allows you to switch between 
two callers or between a conference and an 
individual caller without allowing the wait-
ing caller to listen to the call.

= 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.

Application that requests a service from a 
server.

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 differ-
ent codecs, with differing degrees of com-
pression, for instance. 

Both parties involved in the telephone con-
nection (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 connec-
tion 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.