[asterisk-users] Measuring Jitter in Asterisk

[Douglas Garstang]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Alex Balashov
> Sent: Friday, August 03, 2007 1:37 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Measuring Jitter in Asterisk
> 
> On Fri, 3 Aug 2007, Douglas Garstang wrote:
> 
> > If it COULD, you could leave a tshark process running, constantly
> > measuring jitter in real time. You'd run one for each ITSP you use,
and
> > voila, you have real time jitter metrics on a provider by provider
> > basis.
> 
>    There are various command-line SIP performance test tools (sipp?)
that
> can do this too, I think.

I don't think you could do this with SIPP.... 

> 
>    Also, it may be possible to modify Wireshark's plugin to
periodically
> invoke its jitter analysis function automatically and export the
results
> to some retrievable location.  The most difficult problem would be
> giving it a particular data stream to home in on as a VoIP call;  the
> easiest thing there would be to nail up your own periodic tests from
> a SIP UAC with definable IP endpoint locations and constantly run it
> with that filter.
> 
>    Hackjobs aside, this sort of thing is essentially what products
like
> Brix do, as well as check in with SRTP stats.

Ok, maybe I should call them. But, as I said, if all their product does
is measure QoS and then give you pretty graphs to eyeball, it isn't much
use.

I need something that can measure jitter, latency etc in real time and
then stick the results somewhere, such as in MySQL. I can then choose
ITSP's based not just on route cost, but on a combination of route cost
and historical QoS data.

Doug.