Date: Fri, 09 Nov 2007 19:10:38 +0100 From: Oliver von Bueren <ovb@ovb.ch> To: freebsd-isdn@freebsd.org Subject: Re: echo cancellation / suppression in chan_capi & isdn4bsd by HPS Message-ID: <4734A29E.2080409@ovb.ch> In-Reply-To: <d3dd0e360711070747xa3a77faw1c7cb8656fc796da@mail.gmail.com> References: <d3dd0e360711070747xa3a77faw1c7cb8656fc796da@mail.gmail.com>
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Hi Michael
Michael Iedema wrote:
> - echosquelch - activates some "light" echo cancellation in the
> chan_capi code itself
>
I have set this to yes in capi.conf (and only this, all others don't
work for me at all)
Next thing I did to improve the echo situation on calls from IP phones
to ISDN is to change a default value in i4b_global.h from 9 to 10:
#define I4B_ECHO_CANCEL_P_COMPLEX (10)
Without that, it was pretty bad and my wife complained!
You'll find this file in /usr/src/sys/i4b/include
After the change you have to compile the kernel, I usually do this with:
# cd /usr/src
# make buildkernel installkernel KERNCONF=YOURKERNEL -DNOCLEAN -DNO_CLEAN"
BTW: I've got an AVM Fritz Card on a Point2Point ISDN BRI from our
national telco provider.
# isdnconfig
controller 0 = {
Layer 1:
description : AVM Fritz!Card PCI
type : passive ISDN (Basic Rate, 2xB)
channels : 0x3
serial : 0xabcd
power_save : on
dialtone : enabled
attached : yes
PH-state : Activate indication (priority=8/9)
Layer 2:
driver_type : DRVR_DSS1_P2P_TE
}
The only negative thing I have is that I can't reboot without loosing a
channel on the card. After a reboot one channel stays dead. It looks
like the initialization of the card isn't reaching the same state after
a cold vs. warm reboot. Anyway, I'll have to get something more decent I
think.
Oliver
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