27 May
2005
27 May
'05
4:44 p.m.
Just to add a few more details, Greger is right to point out the quality
inferiority of G.723 compared to those of G711 and G729. In fact, in most VOIP
deployments, in order to quarantee interoperability, a minimum bandwidth of
128K is specified. However to reach the wider "lower bandwidth areas" most
service providers are opting for G.723 which uses either 5.3 or 6.3K. At this
low bandwidth transmission needs, one could literally reach "dial up modem"
equipped areas. in fact most VOIP phone hardware and software are begining to
specify G.723 as their default codec. Note that until the direct media
connection phase of a VOIP vall setup, wide bandwidth is not required. Also
note that analogue phones have a maximim bandwidth need of 3K, hence even the
low quality of G.723/5.3K, compared to the average analogue phone call, is
superior
--
Worrying Is Like Paying Interest On A Loan You Are Yet To Take
Be Happy! Don't Worry,
Quoting "Greger V. Teigre" <greger(a)teigre.com>om>:
Answering a question like that is impossible. It
depends on your deployment
scenario, what you are trying to achieve, the type of service you are
delivering etc. The MOS value for G729 is 4.0, I believe (G711 has 4.3),
with G723 well below 4.0. Thus, the perceived quality of the call will be
considerable less than for 729. WAN-type deployments tend to prefer G729.
g-)
Kofi Obiri-Yeboah wrote:
G723: primary advantage is very low bandwidth
requirements
Hello List:
between G723.1 and G729, what codec do you prefer?
I am just trying to understand pros and cons of both codec.
Thanks,
MOhammad
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