Hope this is the right place to put this, but I’m pulling my hair out. I’m in the process of putting an Asterisk box in the front of a legacy PBX connected via a E1 (Primary Rate) link. I’m the network clocking source (the legacy equipment just sees me as the carrier). I’ve then got SIP trunks in Asterisk to route the call.
This all works swimmingly but after investigating pops / noise on the line, I found this:
PRI got event: HDLC Abort (6) on D-channel of span 1 happening fairly often on calls. (A block of between 2-10 of these errors appears every 5-10 seconds.)
I replaced the cable, same issue, so I grabbed a loopback connector and ran “patlooptest” as per the instructions here. Which returned this:
Now that doesn’t look too good to me…
I changed the legacy equipment I was connecting to to a PRI Buttset and ran some test on that, same result - Working but with crackling occurring exactly when the HDLC Aborts appeared in Monitor.
Further investigation led me to start looking at IRQs, I’ve disabled HyperThreading on the BIOS, which made it a little better, but they’re still happening like crazy, and when I set the other end to be the clock source, and the Digum card to be CPE the same issue occurs.
My system is as follows:
[li]Digium Wildcard TE110P T1 E1 Board[/li]
[li]Dahdi Linux complete 18.104.22.168.9.1[/li]
[li]Ubuntu 12.04.4 LTS[/li][/ul]
I installed Asterisk, DAHDI & libpri from source as described on this link from Digum.
Here’s the output of DAHDI’s “System.conf”
[code]# Span 1: WCT1/0 “Digium Wildcard TE110P T1/E1 Card 0” (MASTER)
loadzone = au
defaultzone = au
Does this sound like I’m on the right track hunting down IRQ related stuff? I’ve been using Asterisk for a while now but always using Gateways… So I’ve never faced this before, any links / advice would be appreciated. Could it be something to do with echo cancellation? The TE110P has no hardware echo cancellation?