[Asterisk-Dev] FIXED: Recent PRI load problem

[Scott Stingel]

Hi John-

I think you have to simulate the traffic so that a bunch of outgoing calls
(>10) are made at exactly the same moment.  Anyway, I was able to determine
that the problem started with the March 30th version of libpri.

Reported as a bug yesterday, and Mark fixed it late last night!  (Thanks
Mark)  Early testing results are good.

Regards
Scott 


Scott M. Stingel
President,
Emerging Voice Technology, Inc.
Palo Alto California & London England
www.evtmedia.com 

-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of John James
Sent: Friday, May 14, 2004 12:41 PM
To: asterisk-dev at lists.digium.com
Subject: RE: [Asterisk-Dev] Recent PRI load problem

I pulled a copy from CVS on 4/30 and haven't had a problem.  I loaded up
18 channels of a PRI and held the connections open for several minutes.
The method I used was to dial out and back in 9 times via the pstn.

John James


-----Original Message-----
From: asterisk-dev-admin at lists.digium.com
[mailto:asterisk-dev-admin at lists.digium.com] On Behalf Of reseaux
Sent: Friday, May 14, 2004 3:00 AM
To: asterisk-dev at lists.digium.com
Subject: Re: [Asterisk-Dev] Recent PRI load problem

Dear Scott
	i have the same problem with my E100P and mt Lucent pbx..
Thanks in advance
Dimitri

On Thursday 13 May 2004 07:19 pm, Scott Stingel wrote:
> Hello-
>
> I attempted last week to update to the latest CVS for my customer in 
> Portugal, in order to take advantage of some new available features.
(I
> have 5 systems running high-volume IVR, each with 4 E1 spans).
>
> In this process, I found that since March 25 (when I last had a
version
> that passed any kind of load test), the PRI driver or related code has
been
> changed, with the result that it can no longer handle load without 
> constantly taking the PRI D-channels down and up.  This of course
results
> in many lost calls.  I can make this happen with my load tester quite 
> easily - it only takes 10 or more simultaneous PRI calls, and happens 
> within 60 seconds.
>
> The first error I get is:
>
> May 13 09:59:02 WARNING[-1200182352]: chan_zap.c:6134 zt_pri_error:
PRI:
> ACK received outside of window, restarting
>   == D-Channel on span 2 down
>
> Followed by many I-frame and S-frame errors that result from the link
being
> down.
>
> I'm trying to narrow down the date and changes made to the chan_zap
and
> related code during April so that I can zero in on the error or bug.
If
> anyone has changed the PRI driver code recently (April probably),
could you
> please contact me or post here for discussion?  I'm trying to gather
more
> info before posting this on the bug list.
>
> Thanks!
> Scott Stingel
>
> PS:  My load tester loops back a designated number of channels on PRI
2 to
> PRI 1, and PRI 4 to PRI 3.  It generates calls on channels on the even
PRI
> spans and receives them on the odd spans.  The receiving dialplan
simply
> answers, plays a message and hangs up.  I have used this software and 
> loopback configuration successfully for about a year now in helping to 
> flush out bugs and limitations of the drivers and hardware.
>
>
>
>
> Scott M. Stingel
> President,
> Emerging Voice Technology, Inc.
> Palo Alto California & London England
> www.evtmedia.com
>
>
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