[Asterisk-Users] Echo on a PRI

[W. Kevin Hunt]

You can have echo even w/ PRI's, it's just that the echo isn't
INTRODUCED at the PRI demarcation point, it is INTRODUCED somewhere
along the call path, usually where the 4 wire digital signal to 2 wire
analogue signal conversion point exist.  We found that moving to a
Compaq DL380 or 6400R and compiling in a few extra options (see one of
my previous post) totally abolished our echo problem. 


W. Kevin Hunt

CCIE #11841
MCSE, Linux+ SME
www.huntbrothers.com
 
-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Ryan Thrash
Sent: Tuesday, July 20, 2004 8:13 AM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Echo on a PRI


> I recently set up the following in a production system (2.8 GHZ Xeon,
> 1 Gig
> Memory, Dell 2650).
>
> Telco - PRI - Asterisk - T1 - PBX
>
> I am getting an occasional noticeable echo on some of the phone lines 
> (random inbound and outbound).  Everyone I ask keeps telling me that I

> can't be having echo since I am on a PRI, which is a digital circuit.

> Ok, so I can't be having echo, but I am!  Does anyone have any ideas 
> of what might be causing the echo in this situation?

Welcome to the club. ;) You have the same exact problem I've got. The
only difference is I'm using dual Xeon 2.4s and a Supermicro
SuperWorkstation 7033A-T (X5DAL-TG2 motherboard
http://supermicro.com/products/motherboard/Xeon/E7505/X5DAL-TG2.cfm ). 
Echo training=800 on a recent CVS helped, but did not totally resolve
the issue.

Best regards,
Ryan Thrash

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