Siemens gigaset s450 ip 사용자 설명서

Gigaset S450 IP LBA / SGP / A31008-M1713-Y221-1-7619 / glossary.fm / 30.8.07

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Asymmetric Digital Subscriber Line

Special form of DSL.

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. 

Restriction of access to a network/serv-

ice by use of a password to log in. 

See Ringback when the number is 

busy.

Enter the complete phone number, and 

correct it if necessary. Then pick up the 

receiver or press the handsfree key to 

dial the phone number. 

See DSL.

Subscriber with whom you exchange 

brief messages on the Internet in real 

time (chatting). 
See also: Instant messaging. 

CF 

Automatic forwarding 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

CW

VoIP provider feature. A beep during a 

call indicates that another caller is wait-

ing. You can accept or reject the second 

call. You can activate/deactivate the 

feature.

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. 

Application that requests a service 

from a server.

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 

that vary, for instance, according to the 

level of compression. 
Both parties involved in the telephone 

connection (caller/sender and recipi-

ent) must use the same codec. This is 

negotiated between the sender and the 

recipient when establishing a connec-

tion. 
The choice of codec is a compromise 

between voice quality, transmission 

speed and the necessary bandwidth. 

A high level of compression, for exam-

ple, means that the bandwidth