<div>Asterisk performs echo cancellation for all incoming and outgoing calls through the T1/PRI card. However, there are some things that can still cause echo's. We had a similar situation a with a setup much like yours. We switched to the MG2 echo canceller which helped quite a bit. But finally, after testing everything else we possibly could, swapping out PRI cards, changing every concevable setting related to echo, and having the phone company out about a dozen times to check the PRI, we ended up switching companies from Telepacific to Sprint and the echo problem, according to the users, completely went away.
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<div>However, a couple things you may want to look at is the audio gain settings in your zapata.conf and make sure they're not set too high, maybe even try dropping them down a bit. And try the MG2 echo canceller if you haven't already, it seems to provide the best results on PRI's, at least as far as our testing has gone.
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<div>Erick</div>
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<div><span class="gmail_quote">On 1/3/06, <b class="gmail_sendername">Aaron Daniel</b> <<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:amdtech@shsu.edu" target="_blank">amdtech@shsu.edu</a>> wrote:
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">We currently have about 60 cisco 7940's, which were converted from cisco<br>call manager to be used for asterisk. We're running
1.2.1 stable on 4<br>systems (primary server, backup server, gateway, and voicemail). The<br>phone lines come into the gateway on a digium te405p. The problem we're<br>having is that the 7940's are echoing on outgoing calls, and I'm not
<br>sure what else to try (I did just recompile zaptel with a different echo<br>canceler to see if it would help), but I seem to remember asterisk<br>doesn't do echo cancellation on outgoing calls. I researched a bit on<br>
qos and latency, but there's maybe a 10ms latency between the phone and<br>the outgoing line, so I ruled that out pretty quick. Any help is<br>greatly appreciated.<br><br>Aaron<br><br>On Tue, 2006-01-03 at 21:26 -0800, Erick Baum wrote:
<br>> Can you provide some details about the system, what version of<br>> Asterisk, what kind of phones, what kind of phone lines, etc.<br>><br>> Erick<br>><br>><br>> On 1/3/06, Aaron Daniel <<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:amdtech@shsu.edu" target="_blank">
amdtech@shsu.edu</a>> wrote:<br>> I've got a slight problem with echo. Basically, most of the<br>> outgoing<br>> phone calls on our system echo, but as far as I can tell, the<br>> incoming
<br>> echo has been relatively fixed, with just a bit of work left<br>> to do on<br>> it. I read somewhere that asterisk doesn't echo cancel on<br>> outgoing<br>> calls, am I wrong in that assumption, and if I am, what else
<br>> can be done<br>> when the echo training and echo cancel tapping isn't working?<br>><br>> Aaron<br>> _______________________________________________<br>> --Bandwidth and Colocation provided by
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