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Area:
Voice codecs
You can influence the quality of your VoIP
connections via the parameters in the
Voice codecs
area. In addition to the lan-
guage codecs used, you can activate/
deactivate "Silence Suppression" and
specify the language and earpiece volume
(VoIP
Volume).
Your phone supports various voice codecs
for digitalising (coding and decoding)
voice data. The voice codec used on a
phone connection has a significant influ-
ence on the voice quality, e.g. through the
time need to code/decode (voice delay).
The choice of voice codec is a compromise
between voice quality and the necessary
bandwidth.
Both sides of a phone connection (caller/
sender side and receiver side) must be
using the same voice codec. The voice
codec is negotiated between the sender
and the recipient when establishing a con-
nection.
Set the voice codec that your phone sug-
gests when establishing a VoIP connec-
tion.
You can choose between the following
voice codecs supported by your phone:
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
press the transmission of language
packages in pauses ("Silence Suppres-
sion",
Enable Annex B for G729
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.
you can sup-
G72
option).
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
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
parameter. You specify
VoIP Volume
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
whether, when using codec G729,
transmission of data packages for
pauses is to be suppressed (Yes).
Web configurator
parameter, specify
field, state
61
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