Voice Quality And Infrastructure - Siemens Gigaset A580IP Manual

Please note
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You should only deactivate codecs (put them in the Available codecs list)
if there is a particular reason. The more codecs that are deactivated, the greater
the risk that calls will not be able to be established due to unsuccessful codec
negotiations. In particular you can only establish broadband connections if you
permit the G.722 codec.
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With incoming calls, all supported voice codecs are always permitted.
Area: Settings for Codecs
To save additional bandwidth and transmission capacity, on VoIP connections that
use the G.729 codec you can suppress the 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 a deterioration in the
voice quality.
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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,
(select Yes).
Saving settings on the phone
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Select Set to save the settings for the voice quality.
Please note
You should observe the following for good voice quality:
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When making calls using VoIP, avoid performing other Internet activities (e.g.
surfing the Internet).
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Please note that voice delays can occur depending on the codec used and the
network capacity utilisation.

Voice quality and infrastructure

With your Gigaset A580 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 components from your VoIP provider may impact performance:
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Router
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DSLAM
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DSL transmission line and speed
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Connection paths over the Internet
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If applicable, other applications that also use the DSL connection
In VoIP networks, voice quality is affected by various things including the "quality
of service" (QoS). If the entire infrastructure has QoS, voice quality is higher (fewer
delays, less echoing, less crackling etc.).
Web configurator – Setting the phone using a PC
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