[Asterisk-Users] asterisk using tdm400p has echo

[Rich Adamson]

> > > Hi list, i'm having a problem with asterisk+pstn termination, i just
> > > bought a TDM400p and connect my phone line(bellsouth) now when im
> > > using the pstn through asterisk there's an echo, i don't know if this
> > > is already have been resolved. If it does please point me to the
> > > instruction how to resolve this.
> >
> > Try reading README.fxotune and using fxotune to see if it improves it.  
> 
> If you do an fxotune and all of the coefficients are 0, does this mean that fxotune is not 
making
> any changes?
> 
> I've got 6 lines that are coming from a channel bank into two TDM cards and have significant
> echo, even with Asterisk HEAD and KB1.  I just ran fxotune, and all 6 lines came back with all
> 0's in fxotune.conf...

Based on what Matt has mentioned previously, fxotune only sets the impedence
to proper values today. He has not implemented the code to set the coefficients
as yet, therefore the expected values are zero's.