Siemens Gigaset C450 IP - Manual (Page 56)

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Web configurator
Gigaset C450 IP / Greek eng / A31008-M1713-T151-2-8U19 / web_server.fm / 19.9.06
Ve
rs
ion 4,
16
.09.
2005
G729
Average voice quality. The necessary
bandwidth is less than 8 Kbit/s per
voice connection.
To save additional bandwidth and
transmission capacity, on VoIP connec-
tions that use Codec G72 you can sup-
press the transmission of language
packages in pauses ("Silence Suppres-
sion", Enable Annex B for G729 option).
Then, instead of the background noises
in your environment, your caller hears
a synthetic noise generated in the
receiver.
Please note: "Silence Suppression"
may mean a deterioration in the voice
quality.
G711 a law/G711 µ law
Excellent voice quality (comparable
with ISDN). The necessary bandwidth is
64 Kbit/s per voice connection.
G726
Good voice quality (inferior to that with
G.711 but better than with G.729).
Your phone supports G.726 with a
transmission rate of 32 Kbit/s per voice
connection.
¤
In the VoIP Volume parameter, specify
the amplification level of the voice and
earpiece volume.
With some VoIP providers it may be the
case that the voice/earpiece volume is
too low or too high. Volume regulation
via the handset may then be insuffi-
cient.
You can pre-adjust the volume via the
VoIP Volume parameter. You specify
whether the adjustable volume range
on the handset should be raised or low-
ered. The following choices are availa-
ble:
Low
Voice/earpiece volume is too low. If you
activate this option the volume is raised
by 6 dB.
Normal
The voice/earpiece volume does not
need to be raised/lowered.
High
Voice/earpiece volume is too high. If
you activate this option the volume is
lowered by 6 dB.
¤
In the Enable Annex B for G729 field, state
whether, when using Codec G729 ,
transmission of data packages for
pauses is to be suppressed ( Yes ).
¤
Apply the voice Codecs that your phone
suggests with outgoing calls into the
Selected codecs list.
Click in the Available codecs list on the
voice Codec that you want to apply
(you can mark several entries using the
Shift key or the Ctrl key). Click on the
<Add button.
¤
Move the voice Codecs that you do not
want the phone to use into the Available
codecs list.
Also select the voice Codec in the Avail-
able codecs list (see above) and click on
the Remove> button.
¤
Sort the voice Codecs in the Selected
codecs list into the order in which they
should be suggested to the receiver
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 receiver to begin
with. If the receiver does not accept this
voice Codec (e.g. because it does not sup-
port it), the 2nd voice Codec in the list is
suggested etc.
If the receiver does not accept any of the
voice Codecs in the Selected codecs list, the
connection is not established. An appro-
priate message will be displayed on the
handset.