[asterisk-users] HPEC audio clipping

[Greg Siemon]

Thanks for the helps Stephen.  I was running non standard gains but setting
regain and txgain to zero (then reloading chan_zap.so) does not help.  I
still get the broken audio, in fact sometimes I don't get any audio at all.
In testing the server just froze a number of times and had to be rebooted
via the power switch.

I am using the latest Zaptel 1.2.16 files and the latest fxotune from the
1.4 release and I still see this issue.

Very interested to get this working but without the HPEC my server is rock
solid (only have to reboot it when I install kernel updates).  I don't
believe it is my system but am happy to do any testing others may suggest.

Kind Regards

Greg

-----Original Message-----
From: Stephen Bosch [mailto:posting at vodacomm.ca] 
Sent: Saturday, 7 April 2007 3:35 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] HPEC audio clipping

Hi:

Greg Siemon wrote:
> Same issue here as well.
> 
> Running Centos 4.4 (x86_64) with all updates installed on a Pentium D
> 2.8 GHz, 1.5GB RAM and TDM800P with 1 x Quad FXS and 2 x FXO ports.
> 
> I installed the new 64 bit HPEC module earlier in the week when it was
> released and have been unable to get it to work.  I have the same
> symptoms as the OP and also noticed that there is much more line noise
> (soft static) than when HPEC is disabled.
> 
> I sent a support request in several days ago and I have not yet seen a
> reply.

I have observed very similar behaviour in an HPEC installation.

Some observations: the clipping happens if receive gain is cranked up.
If I set the gain to defaults, the clipping goes away, but then I have
the problem of users complaining that the remote caller is too quiet.

Another recommendation -- whether or not you are using Zaptel 1.2.x or
1.4.x, you should always the fxotune from 1.4.x.

A question - do the people who are experiencing this problem have
non-default gain settings, either in zapata.conf or in the telephone sets?

-Stephen-