Siemens Gigaset S450 IP - Manual (Page 84)

83
Web configurator
Gigaset S450 IP LBA / SGP / A31008-M1713-Y221-1-7619 / web_server.fm / 30.8.07
Ve
rs
ion 4,
16
.09.
2005
Optimising voice quality for
VoIP connections
You can make general and connection-
specific settings to improve the voice qual-
ity for VoIP telephony.
¤
Open the following Web page:
Settings
¢
Telephony
¢
Audio .
The voice quality for VoIP connections is
mainly determined by the voice codec
used for transferring the data and the
available bandwidth of your DSL connec-
tion.
In the case of the voice codec, the voice
data is digitalised (coded / decoded) and
compressed. A "better" codec (better voice
quality) means more data needs to be to
be transferred, i.e. perfect voice data
transfer requires a DSL connection with a
larger bandwidth.
The following voice codecs are supported
by your phone:
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.
G729
Average voice quality. The necessary
bandwidth is less than 8 kbit/s per voice
connection.
Both sides of a phone connection (caller/
sender side and receiver side) must use
the same voice codec. The voice codec is
negotiated between the sender and the
recipient when establishing a connection.
You can influence the voice quality by
selecting (bearing in mind the bandwidth
of your DSL connection) the voice codecs
your phone is to use, and specifying the
order in which the codecs are to be sug-
gested when a VoIP connection is estab-
lished.
Area: Settings for Bandwidth
The settings in this area influence all VoIP
connections (VoIP phone numbers).
Allow 1 VoIP call only
Generally speaking, you can make
three VoIP calls simultaneously on your
phone. If, however, your DSL connec-
tion has a narrow bandwidth, there
may be problems if three VoIP calls are
made at the same time. The data is no
longer transferred properly (long voice
delay, data losses etc.).
¤
Activate the Yes option next to Allow
1 VoIP call only to prevent any further
parallel VoIP phone connections
being established.
¤
If you wish to permit three VoIP con-
nections, activate the No option.
Please note:
If you do not use your Gigaset.net connection
for six weeks, it is automatically deactivated.
You cannot be reached for calls from the
Gigaset.net.
The connection is reactivated:
– as soon as you start a search in the
Gigaset.net directory (page 25) or
– make a call via the Gigaset.net (dial a
number with #9 at the end) or
– activate the connection via the Web config-
urator as described above.
Please note: If only one VoIP connection is
permitted, the following VoIP network services
are no longer available:
– Call waiting
Call waiting is not displayed during a call via
VoIP.
– External consultation call from a VoIP call
– Toggling and initiating a conference call via
VoIP