[asterisk-users] Problem with TDM2400 and Polycom 501... Voice Quality Lost...

[Noah Miller]

> > I have an asterisk box with one TDM2400, it has 8 FXS's and 12 FXO's,
> > and it also has the echo canceller...
> > I'm running Asterisk 1.2.13 and Zaptel 1.2.12 with the Kernel
> > 2.6.9-34.0.2.EL
> > I'm using Polycom's  501 with the SIP 1.6.2.0041
> >
> > The problem is when someone dials to or from the PSTN through the
> > TDM2400, the voice quality is crappy...Instead of hearing:
> >
> > Hello, this is John
> >
> > You hear..
> >
> > He  o, th  s   J hn
> >
> > I already tried with the fxotune utility, also using G711 or G729,
> > dealing with the gains... but I can't see the light...
>
> This is a bug in the 9.00-002 HPEC echo canceller.
>
> I have no idea when a patch will be available.

I don't think this is the HPEC issue.  I don't think Zaptel 1.2.12
supported HPEC.  This must be the hardware echo can on the TDM2400.

Arturo, can you post your zapata.conf and sip.conf?

Also, I don't think this is your problem, but you may want to consider
upgrading to Asterisk 1.2.17 and Zaptel 1.2.16.  There have been many
bug and security fixes since Asterisk 1.2.13.


- Noah