XonTel S200 Administrator's Guide
www.sahabtec.com
Page94
SPEEX:
Speex is an Open Source/Free Software patent-free audio
compression format designed for speech. The Speex Project aims to lower
the barrier of entry for voice applications by providing a free alternative to
expensive proprietary speech codecs. Moreover, Speex is well-adapted to
Internet applications and provides useful features that are not present in
most other codecs.
G.722:
G.722 is a wideband speech coding algorithms which supports the bit
rate of 64, 56 and 48kbps wideband. It’s a broadband voice encoding of G
series.
G.726:
A PSTN codec, used worldwide, that provides good voice quality and
consumes 32kbit/s in each direction (receiving and transmitting) of a VoIP
call. G.726 is supported by some VoIP phones.
ADPCM, G.729A, H261, H263, H263p, H264, MPEG4
.
Note:
If you would like to use G.729, please enter your license.
4
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QOS
Figure 6-56
QOS (Quality of Service) is a major issue in VOIP implementations. The
issue is how to guarantee that packet traffic for a voice or other media
connection will not be delayed or dropped due interference from other
lower priority traffic.When the network capacity is insufficient, QoS could
provide priority to users by setting the value.
