[Freeswitch-users] FS beats Aculab Prosody S on subjective test on lay users for conference quality

Fernando Testa testa at voicetechnology.com.br
Mon Aug 3 11:17:27 PDT 2009

Hi, a bit late on answering some of the questions, but, here we go.On
Aculab, all codecs were G711u. The same codec we have on FS:

freeswitch at conference> show channels
API CALL [show(channels)] output:
11:34:44,1249310084,sofia/internal/1000 at,CS_EXECUTE,Teste
Testa,1000,,3200,conference,3200- at ultrawideband
11:34:49,1249310089,sofia/internal/1000 at
,CS_EXECUTE,F.G.Testa,1000,,3200,conference,3200- at ultrawideband

2 total.

freeswitch at conference> conference list
API CALL [conference(list)] output:
Conference 3200- (2 members)
2;sofia/internal/1000 at
1;sofia/internal/1000 at;c9cafeb8-803a-11de-8ceb-cb8648fd1ccf;Teste

I think this answers some questions from Michael.
A packet dump I don't have right now.

Fernando G. Testa

On Thu, Jul 30, 2009 at 11:13 AM, Steve Underwood <steveu at coppice.org>wrote:

> David Knell wrote:
> > On Thu, 2009-07-30 at 09:21 +0800, Steve Underwood wrote:
> >
> >>
> >> High quality conferencing is a difficult task, and still a research
> >> topic. No two conferencing systems perform alike. The interesting thing
> >> about this and other reports is that the conferencing in Freeswitch is
> >> not very clever right now, yet people are already saying it beats
> >> various other offerings, including long time commercial offerings.
> >>
> >
> > It may well be that a simplistic implementation (noise gate, add them
> > all up) is all that's required for dealing with small groups or, more
> > generally, groups of any size which have a small number of active
> > speakers at any one time: it's predictable and unlikely to introduce
> > unpleasant side effects.
> >
> This is one of those situations where when you've experienced something
> better you make that your baseline for acceptability. I would consider a
> noise gate horribly crude, and VAD as the minimum for acceptable
> performance. If you've only used a noise gate you get used to it. If
> you're not sufficiently versed in the art you may well think nothing
> better is even possible.
> The fact that even the simple scheme, with noise gating, in Freeswitch
> is getting high praise, is pretty damning of mature commercial products.
> Steve
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Fernando Gregianin Testa
Voice Technology Ltda
+55 11 35882166
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