Glossary
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OpenScape Desk Phone CP200/CP205/CP400/CP600 HFA, Administration Manual
bkglos.fm
DTMF
D
ual
T
one
M
ulti
F
requency. A means of signaling between a phone and e. g. a voicemail
facility. The signals can be transmitted either in-band, i. e. within the speech band, or out-
band, i. e. in a separate signaling channel.
E
EAP
E
xtensible
A
uthentication
P
rotocol. An authentication framework that is frequently used in
WLAN networks. It is defined in RFC 3748.
F
FTP
F
ile
T
ransfer
P
rotocol. Used for transferring files in networks, e. g., to update telephone
software.
G
G.711
ITU-T standard for audio encoding, used in ISDN and -> VoIP. It requires a 64 kBit/s band-
width.
G.722
ITU-T standard for audio encoding using split band -> ADPCM. The audio bandwidth is 7
kHz at a sampling rate of 16 kHz. There are several transfer rates ranging from 32 to 64
kBit/s, which correspond to different compression degrees. The voice quality is very good.
G.729
ITU-T standard for audio encoding with low bandwidth requirements, mostly used in VoIP.
The standard bitrate is 8 kBit/s. Music or tones such as -> DTMF or fax tones cannot be
transported reliably with this codec.
Gateway
Mediation components between two different network types, e. g., -> IP network and ISDN
network.
H
HTTP
H
yper
t
ext
T
ransfer
P
rotocol. A standard protocol for data transfer in -> IP networks.
