Try muting all phones then unmuting them one at a time to see if one of those is the culprit.<div><br></div><div>The conference will send anything it receives from a talking member to the other members. If the phone is sending noise (eg because of no/bad echo cancellation) then that could cause it.<br>

<div><br></div><div>-Steve</div><div><br></div><div><br><br><div class="gmail_quote">On 14 June 2013 14:05, Alexander Haugg <span dir="ltr">&lt;<a href="mailto:Alexander.Haugg@c4b.de" target="_blank">Alexander.Haugg@c4b.de</a>&gt;</span> wrote:<br>

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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">Hi All,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">since yesterday i make some tests with the mod_conference and it works pretty good, but i have on all conference member phones a background noise.<u></u><u></u></span></p>


<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">All configuration changes with the energy level, frame size (interval), volume of microphone or listening do no fix the problem.<u></u><u></u></span></p>


<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">The conference member calls works with PCMA/8000 ptime 20.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">In the wireshark trace i can hearing, the background noise come from the FS to the HiPath 3000.<u></u><u></u></span></p>


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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">You have any idea for correction options?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1f497d">Thanks<u></u><u></u></span></p>
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