Siemens Gigaset S450 IP User Manual page 93

Web configurator
Please note:
– You should only deactivate codecs (put
them in the Available codecs
particular reason. The more codecs that are
deactivated, the greater the danger that
calls will not be able to be established due
to unsuccessful codec negotiations.
– With incoming calls, all supported voice
codecs are always permitted.
Area: Settings for Codecs
To save additional bandwidth and trans-
mission capacity, on VoIP connections that
use codec you can suppress the
G729
transmission of voice packets in pauses
("Silence Suppression"). Then, instead of
the background noises in your environ-
ment, your caller hears a synthetic noise
generated in the receiver.
Please note: "Silence Suppression" can
sometimes lead to deterioration in the
voice quality.
¤
In the
Enable Annex B for codec G729
field, state whether, when using codec
G729, transmission of data packets for
pauses is to be suppressed (activate
option).
Saving settings on the phone
¤
Click on the Set button to save the set-
tings for the voice quality.
Please note:
You should observe the following for good
voice quality:
– When making calls using VoIP, avoid per-
forming other Internet activities
(e.g. surfing the net).
– Irrespective of the codec used and the net-
work capacity utilisation, please note that
voice delays can occur. Therefore, allow
your VoIP calling partner to finish speaking.
Avoid interrupting your calling partner.
92
list) if there is a
Yes
Voice quality and infrastructure
With your Gigaset S450 IP you have the
opportunity to make calls with good voice
quality via VoIP.
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 influ-
ence performance:
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, the voice quality is influ-
enced by various things including the
"quality of service" (QoS). If the entire
infrastructure demonstrates QoS, voice
quality is better (fewer delays, less echo-
ing, 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.