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@lists.freeswitch.org [mailto:freeswitch-users-bounces@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@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@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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