Optimising Voice Quality For Voip Connections - Siemens Gigaset S685 IP Manual

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Optimising voice quality for VoIP connections

You can make general and connection-specific settings to improve the voice
quality for VoIP telephony.
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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 con-
nection.
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 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 Excellent voice quality. The broadband speech codec
bit rate as G.711 (64 kbit/s per speech connection) but with a higher sampling
rate. This allows higher frequencies to be played back. The speech tone is there-
fore clearer and better than for the other codecs (High Definition Sound Per-
formance).
Gigaset S67H, S68H, SL37H and A58H handsets, for example, are HDSP-com-
patible.
G.711 a law / G.711 µ law
Excellent voice quality (comparable with ISDN). The necessary bandwidth is 64
kbit/s per voice connection.
Good voice quality (inferior to that with G.711 but better than with G.729).
G.726
Your phone supports G726 with a transmission rate of 32 kbit/s per voice con-
nection.
G.729 Average voice quality. The necessary bandwidth is less than or equal to 8 kbit/
s per voice connection.
Both parties involved in the telephone connection (caller/sender and receiver)
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 band-
width of your DSL connection) the voice codecs your phone is to use, and spec-
ifying the order in which the codecs are to be suggested when a VoIP connec-
tion is established.
to deactivate STUN.
if you want your phone to use STUN.
Set to save the changes.
Web configurator – setting the phone using a PC
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Settings Telephony
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Audio.
G.722 works at the same
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