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</head><BODY ><div><SPAN style="font-size:10pt;">For the first time on Wednesday, I noticed SIP-SIP echo...very weird.</SPAN></div>
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<div><SPAN style="font-size:10pt;">Normally, I run G729 between all my Grandstream GXP2000 phones, but I tried X-Lite to call one of my Grandstream.  This of course switched my codec over to GSM.  </SPAN></div>
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<div><SPAN style="font-size:10pt;">I had headphones on the PC and the mic muted.  When I spoke in the Grandstream, I could hear a distinct echo.  This even occurred with the Grandstream in another room thinking that the microphone wasn't truly muted.</SPAN></div>
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<div><SPAN style="font-size:10pt;">I do know that the audio stream should not be echoing, and it never has with G729, but the GSM codec must have something in it.</SPAN></div>
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<div><SPAN style="font-size:10pt;">I do not allow my phones to re-invite, so Asterisk was in the stream, but so X-Lite could be the issue.  I was thinking of trying with SJPhone... just haven't had time yet.<br /><br /></span></div>
<div><SPAN style="font-size:10pt;color:navy;">> We have an installation with around 50 sip phones but only 5 of</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> those are hardware.  There are three Grandstream phones, one Snom</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> and one PAP2T.  We are running Asterisk 1.2.8 with an E1 (R2).</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> Only the hard phones are having problems which are either echo or</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> distortion.  The softphones all work fine and no one is reporting</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> any problems.</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">></SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> They are using 3Com switches which are fairly new.  I have really</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> tried all the settings I can think of and it seems impossible that</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> all 5 hard phones are defective.  Obviously the customer is</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> irritated because the hard phones belong to the director and the</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> receptionist and they notice the problem all day.  I still think</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> the problem may be with the switch but I just want to check if</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> anyone has had an experience like this before.</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">></SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> --</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> Carlos Chavez</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> Director de Tecnología</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> Telecomunicaciones Abiertas de México S.A. de C.V.</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">> Tel: +52-55-91169161 Ext 2001</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">></SPAN></div>
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