[Asterisk-Users] Echo cancellation, when software doesn't cut it. Whats next?

[Billy Huddleston]

I've got the same problem NEAR end echo (We hear the echo on OUR side,
person on the PSTN never hears it..)

We're tyring to get our PRI carrier to run us through a echo can, or
re-write it through a switch they have which has built in echo cans...

Ugg..

Thanks, Billy


----- Original Message ----- 
From: "Andrew Kohlsmith" <akohlsmith-asterisk at benshaw.com>
To: <asterisk-users at lists.digium.com>
Sent: Thursday, July 01, 2004 10:56 AM
Subject: Re: [Asterisk-Users] Echo cancellation, when software doesn't cut
it. Whats next?


> On Thursday 01 July 2004 08:39, Robinson Tim-W10277 wrote:
> > All voip providers will use digital 4-wire interconnect to Asterisk or
> > similar, so echo problems are much reduced, as there are only 'echo
> > points' at the far end and your handset.
>
> And on my PRI that is specifically where my echo is coming from... the far
> end.
>
> VOIP calls through nufone have no echo
> MOST PSTN calls through the PRI have no echo
> SOME PSTN calls (usually to local numbers NOT terminated at my local CO)
have
> significant echo...  I too have been unsuccessful in getting this zapped.
>
> My connection:
>
> Norstart MICS <--> Adit600 <---> T100P <-- IAX2 <--> TE405P <--> Bell
Canada
> PRI
>
> *1 = Xeon/2.4 with HT with T100P
> *2 = Xeon/2.4 with HT with TE405P
>
> *2 also does the NuFone IAX2 connection (it is always in the loop, as *1
is on
> a private network)
>
> Strange stuff, I am going to look at T1 echo cancellation hardware if I
cant'
> get this solved.
>
> Tried:
> - echotraining=800 on *1 and *2
> - echocancel=32,64,128 on both
>
> Eventually the MICS will have a digital connection to *1 instead of going
> through the Adit600 but we haven't got there yet :-)
>
> Regards,
> Andrew
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