NeoGate TE100 Administrator Guide
www.yeastar.com Page 33
a-law:
A PSTN standard codec, used outside of North America, that provides very
good voice quality and consumes 64kbit/s in each direction (receiving and
transmitting) of a VoIP call.
GSM:
A wireless standard codec, used worldwide, that provides adequate voice
quality and consumes 13.3kbit/s in each direction (receiving and transmitting) of a
VoIP call. GSM is supported by many VoIP phones.
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)
QOS
Figure 6-10
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.
