<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Date: Mon, 27 Feb 2006 15:01:54 -0600<br>From: "Brent Torrenga" <<a href="mailto:lists@torrenga.com">
lists@torrenga.com</a>><br>Subject: [Asterisk-Users] Echo on PRI/BRI?<br>To: <<a href="mailto:asterisk-users@lists.digium.com">asterisk-users@lists.digium.com</a>><br>Message-ID: <005a01c63be1$0a434920$7200a8c0@oscar
><br>Content-Type: text/plain; charset="US-ASCII"<br><br>Howdy:<br><br>Does echo only occur on analogue PSTN lines, or can it also occur on PRI and<br>BRI lines? If so, for the same reasons? This is a part of our consideration
<br>to transition to BRI.<br><br><br>Sincerely,<br><br>Brent A. Torrenga<br><a href="mailto:brent.torrenga@torrenga.com">brent.torrenga@torrenga.com</a><br><br>Torrenga Engineering, Inc.<br>907 Ridge Road<br>Munster, Indiana 46321-1771
<br><br>219.836.8918x325 Voice<br>219.836.1138 Facsimile<br><a href="http://www.torrenga.com">www.torrenga.com</a><br></blockquote></div><br>Brent-<br><br>Echo can occur for all sorts of reasons- analog conversions as someone else already mentioned, 4 wire to 2 wire in particular- but could also occur in the IP path due to network issues, and can occur on any sort of digital or analog circuit due to various electrical or audio components. (one of the more commonly neglected causes is poor handsets, that do a bad job of isolating the speaker and microphone, or attempt to add sidetone incorrectly (sidetone is the slight echo you should hear of your own voice- it's very hard to hear, but without it, you get the feeling that you're talking to a dead wire). Conversion to BRI/PRI is a last step only, in my opinion, unless you have other compelling reasons to do so- there's a lot of other places to look first.
<br><br>If you could describe more of your particular setup, I'd be happy to give more detailed description of where the problems might lie.<br><br>-Paul Davidson<br> PlanCommunications, LLC<br>