User's Manual

50
Web configurator
Gigaset C450 IP / GBR PTT / A31008-M1713-L151-1-7619 / web_server.fm / 15.5.06
Version 4, 16.09.2005
Outbound proxy
Enter the (fully qualified) DNS name or
the IP address of your provider's out-
bound proxy.
Outbound proxy port
Enter the number of the communica-
tion port used by the outbound proxy.
The default port is 5060.
Area: Voice codecs
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.
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.
¤ 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.
Please note:
With many providers, the outbound proxy is
identical to the SIP proxy.
Please note:
– You should only deactivate Codecs (put
them in the Available codecs list) if there is a
particular reason. The more Codecs 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.