[Asterisk-Users] echo for 15 seconds

[Anthony Wood]

On Thu, Sep 25, 2003 at 11:56:04AM +1000, Shaun Ewing wrote:
> 
> ----- Original Message ----- 
> From: Chad R. Graham
> 
> >For the first 15 seconds of a call I get echo on the ata 186 side only.  I
> >assume after that the echo canceller kicks in but is there any way to make
> it
> >happen faster?
> 
> Same thing here - except we're using Cisco 7960 and 7940 IP phones.
> 
> We're getting used to it, the main thing is that the remote caller doesn't
> hear it (which they don't). A person visiting our office and using the phone
> may get a bit of a surprise though.
> 
> Incoming calls it's not an issue, as the caller would have already gone
> through the IVR/auto attendant and presumably the echo cancellation has
> already kicked in before reaching the operator.
> 
> A related question for those reading this post - is echo cancellation an
> issue with ISDN? I've thought of converting the POTS lines to a couple of
> BRI lines - but if echo is still a problem then I'll leave it until we
> actually need the extra lines.

I've heard from a user on this list that:

1. there is some echo using ISDN4Linux
2. chan_capi removes the echo
3. you can only use one card with chan_capi

Others on the list can correct me/them, I want to know the real story...

cheers,
Woody