[Asterisk-Dev] PRI Error with EWSD Switch

Steve Hanselman SteveH at brendata.co.uk
Mon Jul 19 15:39:28 MST 2004

Well, you've kicked me into activity (shame it's nearly time to knock it on
the head), ok, 8 is a bad FCS i.e. checksum error, we've an Aurora Q.931
analyser hanging off this line and it's not seeing these, neither is our GDK
switch, so there must be some other reason.

6 is ABORT.

I'm just about to start adding code to tally all the various errors.

-----Original Message-----
From: Alfred Certain [mailto:dreampbx at gecko-soft.com] 
Sent: 19 July 2004 22:13
To: asterisk-dev at lists.digium.com
Subject: [Asterisk-Dev] PRI Error with EWSD Switch


We are looking for someone using Asterisk and PRI (E100P Cards) with EWSD

Currently we have the follow error on a Production Asterisk System (Recent

Jul  1 15:40:37 NOTICE[90123]: chan_zap.c:6872 pri_dchannel: PRI got event:
8 on
Primary D-channel of span 1

This is NOT a timming or slip error because we allready tested it with
equipment, We even made some tests with an ISDN Tester and we have some
for the curious one.

At the same time you see the ERROR you can hear some CLICK's and POP's on
call, but eventually all B channels are dropped and calls losted.

After the tests we believe the following is happening:

1-EWSD Public Switch send a message asterisk doesn't understand (PACKAGE TOO
LARGE says the PRI-Intense Debug).
2-Asterisk sends a RESTART CHANNEL message to EWSD Switch
3-EWSD sends a RESTART ACK message to asterisk (and all calls are dropped)

Already tested: Cables, E100P card (we tested four dfts cards), Server (Dell
PowerEdge 600SC and HP Proliant ML100), CVS Source Code (Several versions),
Timming (all options), Asterisk Switchtype (EuroISDN is the best one and the
PSTN uses EuroISDN version 5).

Any idea? Anyone experienced this kind of problem before?


Alfred Certain 
Gecko Software 
An asterisk based IP-PBX 
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