<div><span class="gmail_quote">On 1/2/07, <b class="gmail_sendername">Bill Gibbs</b> <<a href="mailto:bgibbs@edurotech.com">bgibbs@edurotech.com</a>> wrote:</span>
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<p><font size="2">Echo cancel: yes (and zap show channel confirms it's enabled)<br>I would think if echo cancel was the problem incoming faxes would fail as well?</font></p></div></blockquote>
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<div>This is only a guess. The Sangoma is detecting the fax when it receives it, and is turning off echo cancel. However, when box b sends via IAX2 or SIP to box a, the Sangoma no longer knows that it is a fax transmission and is continuing echo cancellation. The Cisco 3660 recognizes that it is a fax and turns off echo (or doesn't have echo cancellation).
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<div>Question: If you turn OFF echo cancellation, does it work then?</div><br> </div>