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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>
<div> </div>
<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>
<div> </div>
<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>
<div> </div>
<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>
<div> </div>
<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>
<div><SPAN style="font-size:10pt;color:navy;">>
_______________________________________________</SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">>
--Bandwidth and Colocation provided by Easynews.com --</SPAN></div>
<div><SPAN
style="font-size:10pt;color:navy;">></SPAN></div>
<div><SPAN style="font-size:10pt;color:navy;">>
asterisk-users mailing list</SPAN></div>
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