[asterisk-users] MixMonitor - garbled/corrupted WAV files

[Shaun Ruffell]

On Tue, Jun 28, 2011 at 01:24:43PM -0400, Mike wrote:
> 
> > On Tue, Jun 28, 2011 at 11:30:54AM -0400, Mike wrote:
> > > I've had problems with MixMonitor recordings.  A lot (I'd say almost
> > > 50%) of those are corrupted (can`t be opened) or garbled.  That is on
> > > only one server, which is using the same Asterisk version (1.6.2.18)
> > > as the other servers which are mostly fine.
> > >
> > > What can be the cause?  The conversation themselves are reportedly of
> > > good quality, only the recording is a problem.
> > >
> > > Hint: this server does not have PRI Digium cards installed (pure SIP,
> > > only a transcoder card), while the others do. Could this be the cause?
> > > Dahdi_test shows 99.9xxx% accuracy with the dummy timer.
> > 
> > Which version of DAHDI are you using?
> > 
> 
> 2.4.0 on the problem one. I don't have Dahdi cards though. 

Is the server able to keep acurate time or is there clock drift and/or large
skews with ntpd?

The timer in the core of DAHDI uses the "wall-clock" of the system to
determine the timing. If that jumps around...I could imagine how you might get
garbled recordings (or garbled audio on calls that are in coferences).

-- 
Shaun Ruffell
Digium, Inc. | Linux Kernel Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at: www.digium.com & www.asterisk.org