The analog phones are a common cause of echo. Look for settings on the device to use an echo canceler.<div><br><br><div class="gmail_quote">On Tue, Dec 6, 2011 at 8:58 PM, Boris Kovalenko <span dir="ltr"><<a href="mailto:boris@tagnet.ru">boris@tagnet.ru</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div bgcolor="#FFFFFF" text="#000000">
Hello!<br>
<br>
We are not using headsets and speaker phones. Only standard
analog phones connected via Linksys or Audiocodes devices. I have
tested LG, Nortel, Samsung, Panasonic phones with same result. The
problem exists only _inside_ my network. So, for example:<br>
<br>
Audiocodes -- FreeSwitch -- Linksys ... echo present (often)<br>
Linksys -- FreeSwitch -- Linksys echo present (rarely)<br>
Audiocodes / Linksys -- Freeswitch -- Cisco 5350 -- PSTN (echo never
present)<br>
Audiocodes / Linksys -- FreeSwitch -- remote calling party over
internet (echo never present)<div><div></div><div class="h5"><br>
<br>
<br>
<br>
<blockquote type="cite">Headsets, speaker phones, calling a remote party over
high latency.<br>
<br>
<div class="gmail_quote">On Tue, Dec 6, 2011 at 8:49 PM, Boris
Kovalenko <span dir="ltr"><<a href="mailto:boris@tagnet.ru" target="_blank">boris@tagnet.ru</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello!<br>
<br>
I have tested many phone models with same result. So my
VOIP isn't<br>
properly functioning? Jeff, may You tell me what should I
double check<br>
to eliminate echo?<br>
<div>
<div><br>
> Its not possible to have echo in a pure VOIP
(properly functioning)<br>
> implementation. The only source of echo would be from
acoustic echo on your<br>
> phones which is most likely what you are
experiencing. A Jitter buffer wont<br>
> help this problem.<br>
><br>
> --<br>
> View this message in context: <a href="http://freeswitch-users.2379917.n2.nabble.com/Does-I-need-jitter-buffer-tp7065665p7067246.html" target="_blank">http://freeswitch-users.2379917.n2.nabble.com/Does-I-need-jitter-buffer-tp7065665p7067246.html</a><br>
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at Nabble.com.<br>
><br>
>
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<font color="#888888">--<br>
Regards,<br>
Boris<br>
</font>
<div>
<div><br>
<br>
<br>
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</blockquote>
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<br>
<br clear="all">
<div><br>
</div>
-- <br>
Anthony Minessale II<br>
<br>
FreeSWITCH <a href="http://www.freeswitch.org/" target="_blank">http://www.freeswitch.org/</a><br>
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<br>
<fieldset></fieldset>
<br>
<pre>_________________________________________________________________________
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</pre>
</blockquote>
<br>
<br>
<pre cols="72">--
Regards,
Boris
</pre>
</div></div></div>
<br>_________________________________________________________________________<br>
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<br>
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<br>
Official FreeSWITCH Sites<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Anthony Minessale II<br><br>FreeSWITCH <a href="http://www.freeswitch.org/">http://www.freeswitch.org/</a><br>ClueCon <a href="http://www.cluecon.com/">http://www.cluecon.com/</a><br>
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</div>