[asterisk-users] Static on calls - v1.8.15.0

[James Lamanna]

On Thu, Nov 8, 2012 at 8:47 AM, Richard Mudgett <rmudgett at digium.com> wrote:

> > I'm testing out a server with asterisk 1.8.15.0 on it.
> > I'm experiencing static occurring on almost 90% of calls on this
> > particular server.
> > All test phones are using SIP, and calls to/from PSTN servers are
> > delivered using IAX2.
> >
> >
> > I have other production servers running 1.4.x that do not have this
> > issue that use the same PSTN connections.
> > I haven't seen any ethernet errors or anything like that. Load is
> > minimal since this is still a test server.
> > The server itself has 16GB of RAM and Dual Quad Core Xeon E5345s.
> >
> >
> > I'm sort of baffled as to where to start looking for the root cause
> > of this issue, but it appears to be isolated to only this machine.
>
> You might have an A-law/u-law mismatch in the audio path.  That
> kind of mismatch sounds like static on the line.
>
>
Hmm, would  translation from ulaw -> gsm cause that as well?
I noticed in 1.8 apparently iax2  allow=ulaw is off...

-- James
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