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Web configurator – configuring the telephone via a PC
Optimising voice quality for VoIP connections
Gigaset C470-C475 IP / GBR / A31008-M1916-L101-1-7619 / web_server.fm / 7.2.08
Ve
rs
ion 2.
1,
08.0
1.20
07
Area:
Settings for Codecs
To save additional bandwidth and transmission capacity, on VoIP connections that use
codec
G.729
you can suppress the transmission of voice packets in pauses ("Silence Sup-
pression"). Then, instead of the background noises in your environment, your caller hears
a synthetic noise generated in the receiver.
Please note:
"Silence Suppression" can sometimes lead to deterioration in the voice qual-
ity.
¤
In the
Enable Annex B for codec G.729
field, state whether the transmission of data packets
during pauses should be suppressed when using the
G.729
codec, (activate
Yes
).
Saving settings on the phone
¤
Click
Set
to save the settings for the voice quality.
Voice quality and infrastructure
A Gigaset C470 IP or C475 IP will allow you to make calls with good voice quality via the
Internet.
However, your phone's performance with VoIP – and therefore the voice quality – also
depends on the properties of the entire infrastructure.
The following VoIP provider components are just some of the things that can influence per-
formance :
u
Router
u
DSLAM
u
DSL transmission line and speed
u
Connection paths over the Internet
u
If necessary, other applications that also use the DSL connection
In VoIP networks, voice quality is affected by various things including the "quality of serv-
ice" (QoS). If the entire infrastructure demonstrates QoS, voice quality is better (fewer
delays, less echoing, less crackling etc.).
If, for example, the router does not have QoS, then the voice quality is not as good. Please
see the specialist documentation for further information.
Please note:
You should observe the following for good voice quality:
– When making calls using VoIP, avoid performing other Internet activities (e.g. surfing the Inter-
net).
– Irrespective of the codec used and the network capacity utilisation, please note that voice delays
can occur.