Siemens Gigaset C450IP 사용자 설명서

Gigaset C450 IP / Greek eng / A31008-M1713-T151-3-8U19 / web_server.fm / 24.9.07

Ver

si

on 4, 16.

09.20

05

You can influence the quality of your VoIP 

connections via the parameters in the 

 area. In addition to the lan-

guage codecs used, you can activate/

deactivate "Silence Suppression" and 

specify the language and earpiece volume 

(

). 

Your phone supports various voice codecs 

for digitalising (coding and decoding) 

voice data. The voice codec used on a 

phone connection has a significant influ-

ence on the voice quality, e.g. through the 

time need to code/decode (voice delay). 

The choice of voice codec is a compromise 

between voice quality and the necessary 

bandwidth. 
Both sides of a phone connection (caller/

sender side and receiver side) must be 

using the same voice codec. The voice 

codec is negotiated between the sender 

and the recipient when establishing a con-

nection. 
Set the voice codec that your phone sug-

gests when establishing a VoIP connec-

tion. 
You can choose between the following 

voice codecs supported by your phone:

Average voice quality. The necessary 

bandwidth is less than 8 Kbit/s per 

voice connection. 
To save additional bandwidth and 

transmission capacity, on VoIP connec-

tions that use codec 

 you can sup-

press the transmission of language 

packages in pauses ("Silence Suppres-

sion", 

 option). 

Then, instead of the background noises 

in your environment, your caller hears 

a synthetic noise generated in the 

receiver.
Please note: "Silence Suppression" 

may mean a deterioration in the voice 

quality. 

Excellent voice quality (comparable 

with ISDN). The necessary bandwidth is 

64 Kbit/s per voice connection. 

Good voice quality (inferior to that with 

G.711 but better than with G.729). 
Your phone supports G.726 with a 

transmission rate of 32 Kbit/s per voice 

connection. 

¤

In the 

 parameter, specify 

the amplification level of the voice and 

earpiece volume. 
With some VoIP providers it may be the 

case that the voice/earpiece volume is 

too low or too high. Volume regulation 

via the handset may then be insuffi-

cient. 
You can pre-adjust the volume via the 

 parameter. You specify 

whether the adjustable volume range 

on the handset should be raised or low-

ered. The following choices are availa-

ble: 

 

Voice/earpiece volume is too low. If you 

activate this option the volume is raised 

by 6 dB. 

The voice/earpiece volume does not 

need to be raised/lowered. 

Voice/earpiece volume is too high. If 

you activate this option the volume is 

lowered by 6 dB. 

¤

In the 

 field, state 

whether, when using codec 

, 

transmission of data packages for 

pauses is to be suppressed (

).