Optimising Voice Quality For Voip Connections - Siemens Gigaset C470 IP User Manual

Web configurator – configuring the telephone via a PC

Optimising voice quality for VoIP connections

Activating/deactivating the Gigaset.net connection
Your phone is assigned a Gigaset.net phone number on delivery. As soon as you have con-
nected your phone to the Internet, you can make calls using the Gigaset.net and receive
calls from other Gigaset.net subscribers, provided that your Gigaset.net connection has
been activated. You can deactivate the Gigaset.net connection.
¤
Open the following Web page:
tions will be displayed (see Figure 3 on page 132).
¤
In the
Gigaset.net
( ) the Gigaset.net connection.
Please note:
If you do not use your Gigaset.net connection for six weeks, it is automatically deactivated. You can-
not 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 40) or
– make a call via Gigaset.net, i.e. dial a number ending in #9 (two attempts may be necessary) or
– activate the connection via the Web configurator as described above.
Optimising voice quality for VoIP connections
You can make general and connection-specific settings to improve the voice quality for
VoIP telephony.
¤
Open the following Web page:
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 connection.
In the case of the voice codec, the voice data is digitalised (coded / decoded) and com-
pressed. A "better" codec (better voice quality) means more data needs 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:
G.722
If you register an HDSP capable handset (HDSP= High Definition Sound Performance)
with your base station, the calls you make using the handset via G.722 VoIP connections
will have a fantastic sound quality. Gigaset handsets S67H and SL37H, for e.g., are HDSP
capable.
The broadband speech codec
speech connection) but with a higher sampling rate.
G.711 a law / G.711 µ law
Excellent voice quality (comparable with ISDN). The necessary bandwidth is 64 kbit/s
per voice connection.
G.726
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.
140
Settings
area: use the option in the
Settings
G.722
¢ ¢
Telephony
column to activate (
Active
¢ ¢
Telephony
works at the same bit rate as G.711 (64 kbit/s per
Connections. The list of connec-
) or deactivate
Audio.