[Asterisk-Users] GSM v iLBC for low bandwidth connections

[Tjapko ITS Consult at ncy]

Interesting point. Are there VoIP terminators that can accept iLBC or where
can I find them? Are there any hardware endpoints that can handle this
codec? Tjapko.

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of Andrew
Kohlsmith
Sent: Viernes, 14 de Mayo de 2004 07:41 a.m.
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] GSM v iLBC for low bandwidth connections


> I've been playing with GSM and iLBC over low bandwidth connections
> (central Asterisk box with 2mbps, to ADSL users on 512/256) and both
> seem to perform well. Based upon what I've read in the archives and
> at voip-info.org iLBC should perform a little better if packets are
> lost, than compared to GSM. Do you find this to be true in practice,
> or is GSM just as robust?

I believe that iLBC has better MOS in lossy environments than all other
protocols, period.  I use it exclusively now with the VOIP providers I use
for LD.

> Whilst I'm asking questions, in terms of sound quality would there be
> a significant benefit in switching to g.729?

I have had *zero* voice quality issues with iLBC.  I have had voice quality
issues due to links that were full, but that's not iLBC's fault.  The only
reason I can see using g.729 these days is for low-bandwidth
interoperability
with commercial VOIP equipment that doesn't use iLBC.  Seriously.  The
difference between 11-13kbps for an iLBC conversation vs 8kbps for g.729 is
negligable to me.  Maybe if you had a thousand calls pumping out your
connection, but then again the $10k you spent on g.729 licenses can probably
buy a slightly faster link.  :-)

Regards,
Andrew
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