Voice quality for VoIP connections
Functions to improve the voice quality on VoIP connections (IP or Gigaset.net) are available on
the 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 connection.
In the case of the voice codec, the voice data is digitised (coded/decoded) and compressed. A
"better" codec (better voice quality) means more data needs to be transferred, i. e. it requires a
DSL connection with a larger bandwidth. You can change 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 suggested when a VoIP connection is
established. Default settings for the codecs used are stored in your phone; one setting optimised
for low bandwidths and one for high bandwidths. The following voice codecs are supported:
Excellent voice quality. The broadband voice codec G.722 works at the same bit rate as G.711
(64 kbit/s per speech connection) but with a higher sampling rate. You can use this to play
back higher frequencies. The speech tone is therefore clearer and better than with the other
codecs (High Definition Sound Performance).
G.711 a law / G.711 µ law
Excellent voice quality (comparable with ISDN). The required bandwidth is 64 kbit/s per voice
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.
Average voice quality. The necessary bandwidth is less than or equal to 8 kbit/s per voice
To save additional bandwidth and transmission capacity on VoIP connections that use the
G.729 codec you can suppress the transmission of voice packets in pauses ("silence
suppression"). Instead of the background noises in your environment, your caller then hears
a synthetic noise generated in the receiver (option: Enable Annex B for codec G.729).
If the provider (fixed line network and/or Internet telephony) has a network mailbox, this is
displayed on the following web page:
¤Settings Telephony Network mailboxes
You can enter the phone numbers for the network mailbox here and switch the network mailbox
for the configured VoIP connections on and off.