asterisk users - Apr 2007 - Problem with TDM2400 and Polycom 501... Voice Quality Lost...

Hi List...

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...


Any Ideas ?

-- 
Ing. Arturo Ochoa N
Network Administrator
Electrosystems,

Arturo Ochoa wrote:
> Hi List...
> 
> 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.

-Stephen-