[Asterisk-Users] Will Echo problems EVER be solved, I'm scared

[Matt Fredrickson]

On Fri, Aug 26, 2005 at 02:00:54PM -0600, Rich Adamson wrote:
> Relative to the fxotune app, it would appear the app is specific
> to the v2.4 kernels (/dev/zap*), which the v2.6 kernels don't use

It should with 2.4 and 2.6.  2.6 kernels with properly configured udev
rules should create the /dev/zap/* entries dynamically.

> (but rather the udev equivalent). (When I had * running on a v2.4
> kernel, the output from fxotune never deviated from all zero's. So
> I'm assuming the default chipset values were already tweaked by the
> chipset manufacturer to US telco lines. If that is true, then 
> running fxotune in the US has very little value.)

Sometimes in the US you still deal with line impedance issues.  In fact,
I was told by an engineer that worked for the company that designs the
line interface part that the bulk of echo problems (with line interface 
parts such as this) are related to AC impedance mismatches (which is one
reason why I haven't done the digital hybrid tuning portion of fxotune
still).  It should work the same regardless of which kernel (2.4 or 2.6)
you are using.

If it doesn't, and you have udev setup correctly, something is fundamentally
wrong in the setup.

-- 
Matthew Fredrickson