[Freeswitch-users] Removing echo.

[Sean Devoy]

Hey Anthony,

 

Does that mean PBXMate is not worth investigating?

 

I have to disagree here. Placing the blame entirely on the phones at the
other end doesn't hold water for me.  I have had echo problems calling from
my cell phone when leaving a voice mail on FS where there is no phone at the
other end. So clearly there are situations where it ain't just the phone at
the other end.  It also leaves no explanation why Cisco Phones and Linksys
ATAs don't have the same problem with Commercial Venders like Vonage.  They
don't have anything different at the end of the line for echo cancellation
then FS does. I have also had users confirm they are still getting echo with
the microphone MUTED on my end.

 

Again, I love FS and I am not trying to bash anyone or any code.  I am just
saying there has to be more to this puzzle.  I know what a crappy speaker
phone's echo sounds like and I am not at all concerned about that. Crappy
speaker phones sound like crappy speaker phones no matter what. I don't
think that's what I am trying to track down.  These are business call where
90% are using the standard handset on business quality phones.  It happens
at various levels, but when it is at the bad end of the spectrum (e.g. long
delay and loud), it does not sound like echo off of walls coming back in a
microphone.  It is like my input channel has been delayed, softened and
looped directly back to me crystal clear.  Maybe it is one of my VOIP
providers' hardware or software and is load dependent, but the problem
exists outside of cheap phones. And of course it is only reproducible on 3
calls in a hundred at peak usage hours, making it a nightmare to track or
diagnose.  But those 3 calls are the ones my customers want to talk about at
billing time.

 

Now, I have just thrown that all out there is hopes that 50 people will say
"That absolutely never happens to me with FS" so I can look at it a
different way.

 

Thanks for your thoughts.

Sean

 

From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony
Minessale
Sent: Monday, March 18, 2013 7:30 PM
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] Removing echo.

 

The best place for echo cancelation is in the clients as close to the mic as
possible.

Someone asked why skype and some apps are better.  It's because they have
echo cans in the client app.

Sip soft phones are basically toys unless they have some kind of advanced
gain and echo controls on your pc because that is where your mic is and
could have the vol turned up too high etc.

 

>From FS perspective in the middle, we can't tell its echo or not because we
are just passing the data along and we're typically getting it 30-70 ms too
late.  

 

 

In general, you don't get echo when using real phones because they have
proper hardware and software to deal with the place where the audio is being
sampled and rendered.

 

 

 

 

 

On Mon, Mar 18, 2013 at 5:15 PM, Christopher Rienzo <cmrienzo at gmail.com>
wrote:

Echo cancellation is not easy.  The only open source one I've seen is GPL
(making it license incompatible with FreeSWITCH) and is not suitable for
handling echo over IP networks.  Perhaps tricks are being played using VAD
to only allow only one speaker at a time in the ooVoo conference?





On Mon, Mar 18, 2013 at 5:53 PM, Mimiko <vbvbrj at gmail.com> wrote:

Today we tried ooVoo conference system with theirs client using same
boxes and microphones - again, no echo. How this can be? Is it only
commercial products have echo removing function?


--
Mimiko desu.

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-- 
Anthony Minessale II

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