167
Setting the phone with the PC
S675IP / USA-CAN eng / A31008-xxxx-xxxx-x-xxxx / web_server.fm / 14.05.2009
Ve
rs
ion 8,
03
.09
.200
8
Voice codecs
Prerequisite:
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 for outgoing calls into
the
Selected codecs
list.
To do this, in the
Available codecs
list select the voice codec that you want to
apply (you can mark several entries using the Shift key or the Ctrl key).
Select
<Add
.
¤
Move the voice codecs that you do not want the phone to use into the
Available codecs
list.
Select the voice codecs in the
Selected codecs
list (see above) and click the
Remove>
button.
¤
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 estab-
lished. 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 this voice 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 is dis-
played on the handset.
If the phone always starts by trying to establish a broadband connection, put
the
G.722
codec at the top of the
Selected codecs
list.
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
environment, 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 G.729
field, state whether the transmission of
data packets during pauses should be suppressed when using the
G.729
codec, (select
Yes
).
Please note
u
Only deactivate codecs (put them in the
Available codecs
list) if there is a par-
ticular reason. The more codecs that are deactivated increases the risk of
calls not being established due to unsuccessful codec negotiations. In par-
ticular you can only establish broadband connections if you permit the
G.722
codec.
u
With incoming calls, all supported voice codecs are always permitted.
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