[asterisk-users] adding second TDM400P card causes echo cancellation to fail for all Zap channels

[Stephen Bosch]

Stephen Bosch wrote:
> Hi, folks:
> 
> Yesterday I added a second TDM400P card to a working, echo-free server
> running HPEC.
> 
> Today, I'm getting these messages:
> 
>> Apr 20 09:12:12 WARNING[5679]: chan_zap.c:1551 zt_enable_ec: Unable to enable echo cancellation on channel 3
> 
> along with complaints of severe echo. The channels have all been tuned
> using 'fxotune -s' and the echo numbers are all under 2%. I guess that
> Asterisk can't do echo cancellation on these channels.
> 
> Why would I be getting this?

Maybe I would be getting this because I didn't have the zaphpec_enable
in my system startup :)

So -- for future reference, in case anybody else makes this mistake:

zaphpec_enable has to run at boot time, after the zap modules are loaded.

I'll go back to my corner now.

-Stephen-