Re: [Serusers] G723.1 vs G729 - sr-users

27 May 2005

I tried G723 on hardphone on dialup over mediaproxy.
On Dialup UA end up/down stream was 24k/19k
It was nice call but sometimes both party of both end noticed voice loss.

Thanks,
MOhammad

Original Message:
-----------------
From: Iqbal iqbal(a)gigo.co.uk
Date: Fri, 27 May 2005 15:36:07 +0100
To: kofi(a)radiocomplex.com, serusers(a)iptel.org
Subject: Re: [Serusers] G723.1 vs G729

the 5.3, 6.3K are really theoretical, i dont think they include IP 
overheads, I  used media_sessions.phtml, and looked at the actual calls 
per codec, and I dont think u can really get a good call without 50-70K, 
also most bandwidth providers (at least here in the UK) are 
asymmetrical, so even on a 128K, u could have problems.

Having said that I have done a nice call on xlite using ilbc on dial up.

Iqbal

Kofi Obiri-Yeboah wrote:

...
 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

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