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@gigo.co.uk Date: Fri, 27 May 2005 15:36:07 +0100 To: kofi@radiocomplex.com, serusers@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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