[asterisk-users] Audio going blank for a few seconds andthencomesback. What could be the reason?

[Steve Hanselman]

There seem to be two threads here that mention multi-second loss with
the common part being a PRI, certainly for my situation it's purely PRI
as the asterisk box sits in between the telco and another PRI enabled
PBX and the calls are bridged between the two.

There is no network traffic involved in this case.

Not sure where to go with mine though, the load average is nice and low,
I don't see any missed interrupts and it's only started happening in the
last few weeks since an asterisk upgrade.

Latest FC6 kernel, latest yum'd asterisk, zaptel etc

Not sure whether it's worth pulling a SVN version down and building
that, the only issue is I can't currently reproduce this on demand.


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Andrew
Kohlsmith
Sent: 01 June 2007 14:36
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Audio going blank for a few seconds
andthencomesback. What could be the reason?

On Friday 01 June 2007 9:24 am, Rob Schall wrote:
> comcast high-speed, thinking that would be more than enough. Turned
out
> though, with most high speed solutions, there is some limited packet
> loss and its just to be expected. You internet browsers, etc, would

Limited packet loss != **EIGHT SECONDS** of network breakage.  Jitter
buffers 
and PLC takes care of most normal network indiscretions, but period
dropouts 
of that big of a time aren't normal and indicate a bigger issue, either
with 
the hardware or the link itself.

> normally just re-request the packet and move on, but with a stream,
> you're out of luck. The only real solution is to have a dedicated T1
or
> mpls connection or something like that for perfect quality. We have
> solid connections between our offices and haven't had a problem yet.

I have numerous installations using standard telco (Bell Canada and
Telus) 
DSL, and at least one on Rogers cable here in Ontario.  No real
problems.  
The odd problem if the pipe gets saturated but careful design and
monitoring 
can take care of most of these problems.

I agree with Mr. Hanselman; get a packet logger on the link and see
what's 
really going on.  Until that's done, everything here is just
speculation.  I 
have seen bugs in the IAX2 and SIP jitter buffers on Asterisk which
cause 
dropouts like this, and I'd like to see what's actually going on before 
pointing any fingers.

-A.
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