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Optimising voice quality for VoIP connections Web configurator
Gigaset C470-475 IP / EN for IM-Ost / A31008-xxxx-xxxx-x-xxxx / web_server.fm / 16.8.07
Version 2.1, 08.01.2007
High
Voice/earpiece volume is too low. Activate this option to increase the volume by 6 dB.
Voice codecs
Precondition: The Own Codec preference option is activated for the Voice Quality in the
Settings for Bandwidth area.
Select the voice codecs your phone is to use, and specify the order in which the codecs
are to be suggested when a VoIP connection is established via this VoIP phone number.
¤ Apply the voice codecs that your phone is to suggest with outgoing calls into the
Selected codecs list.
To do this, in the Available codecs list click the voice codec that you want to apply (you
can mark several entries using the Shift key or the Ctrl key). Click <Add.
¤ Move the voice codecs that you do not want the phone to use into the Available codecs
list.
Also, select the voice codecs in the Selected codecs list (see above) and click Remove>.
¤ Sort the voice codecs in the Selected codecs list into the order in which they should be
suggested to the receiving device when a connection is established. To do this, use
the Up and Down buttons.
When establishing a VoIP connection, the phone suggests the 1st voice codec in the
Selected codecs list to the receiving device to begin with. If the receiving device does not
accept the codec (e.g. because it is not supported), the 2nd voice codec on the list is
suggested, and so on.
If the receiving device does not accept any of the voice codecs in the Selected codecs list,
the connection is not established. An appropriate message will be displayed on the
handset.
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.
Please note:
– You should only deactivate codecs (put them in the Available codecs list) if there is a particular rea-
son. 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.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
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