<html><head><base href="x-msg://180/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>What phone load are you using? I'm not aware of anything along these lines being tracked on the 99xx phones in recent loads.</div><div><br></div><div>Stepping back to the fundamentals of echo - If the mic is too sensitive and then environment introduces noise then echo is unavoidable. DSPs train on the audio signal that is sent out to the speakerphone speaker. If that audio is mixed with noise in the environment then the audio signal that comes back into the speakerphone microphone will be distorted. Because of the distortion from the noise the ECAN will not recognize the echo signal in the incoming audio. This could just come down to microphone sensitivity. I believe there were issues with mic sensitivity in early phone loads.</div><div><br></div><div>/wes</div><div><br></div><div><br><div><div>On Oct 26, 2011, at 11:31 AM, Eric Pedersen wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div lang="EN-US" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">We are having intermittent problems with echo on calls to 9971 phones on speaker. I've been able to reproduce this, but not consistently and it seems to only occur on some calls, primarily internal though I suppose PSTN calls may be having the same problem but the gateway DSPs are suppressing it. Basically when someone calls me on my 9971 and I take the call on speakerphone they hear their own voice echoing and background HVAC noise. It seems like the built-in echo canceller is not working when this happens. I've tried different phones in the same physical space with the problem occurring on some but not others so I don't think it's the room layout. Has anyone else seen anything like this?<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Thanks,<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Eric<o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div><div> </div>The contents of this message may contain confidential and/or privileged<br>subject matter. If this message has been received in error, please contact<span class="Apple-converted-space"> </span><br>the sender and delete all copies. Like other forms of communication,<span class="Apple-converted-space"> </span><br>e-mail communications may be vulnerable to interception by unauthorized<span class="Apple-converted-space"> </span><br>parties. If you do not wish us to communicate with you by e-mail, please<span class="Apple-converted-space"> </span><br>notify us at your earliest convenience. In the absence of such<span class="Apple-converted-space"> </span><br>notification, your consent is assumed. Should you choose to allow us to<span class="Apple-converted-space"> </span><br>communicate by e-mail, we will not take any additional security measures<br>(such as encryption) unless specifically requested. _______________________________________________<br>cisco-voip mailing list<br><a href="mailto:cisco-voip@puck.nether.net" style="color: blue; text-decoration: underline; ">cisco-voip@puck.nether.net</a><br><a href="https://puck.nether.net/mailman/listinfo/cisco-voip" style="color: blue; text-decoration: underline; ">https://puck.nether.net/mailman/listinfo/cisco-voip</a><br></div></span></div><br></div></body></html>