We have occasional echo, mostly on lines that come across as quiet.. I am trying to troubleshoot how to disolve the echo. i have tried the steps on voip wiki, but have not recently been able to make any difference. the echo isnt horrible most of the time, and seems extremely random in that i can call a number once without echo, then dial the same number a second time and get echo. things i am currently considering (and would like to know if these might be useful) 1> upgrade from 1.09 ( asterisk at home ) to 1.2 cvs code base 2> when the phone lines were pulled off the T1, sets of four were grouped into wire pairs inside a single cat 5 wire. So coming from the punch down block to the tdm are 2 cat5 cables (i have 2 tdm cards) each containing 4 lines with what i assume is marginal shielding from each other. am i way off-base on these hopes? thanks
On Wed, Aug 31, 2005 at 08:45:34PM -0500, chris gamble wrote:> the echo isnt horrible most of the time, and seems extremely random in > that i can call a number once without echo, then dial the same number a > second time and get echo. > > things i am currently considering (and would like to know if these might > be useful) > 1> upgrade from 1.09 ( asterisk at home ) to 1.2 cvs code baseThat is worth a shot. There are a few new echo-related features that have been added: 1.) fxotune - try this first. There is a file called README.fxotune that explains how to use it. It is primarily for doing echo related line tuning (which in your case possibly won't help). 2.) Also, there is a new echo canceller in CVS-HEAD zaptel that has received a lot of positive feedback. Look in zconfig.h for ECHO_CAN_KB1 for further information. -- Matthew Fredrickson