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<div>Maybe it is buffering issues with the kernel? Does it happen only when there is a peak in the new calls rate? Do all 180 messages get dropped?</div>
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<div> __Yehavi:</div>
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<div>2009/4/19 Nir Levi <span dir="ltr"><a href="mailto:NirL@bezeqint.co.il">NirL@bezeqint.co.il</a></span></div>
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<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">Hello,</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">SIP invites are accepted from imitator , but 'SIP 180' is not responded back to imitator. </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">By inspecting the issue , we can *<b>see</b>* the response is generated and sent from asterisk (via asterisk logger ("sip debug" )) , but while sniffing the interface with tcpdump, we can't see 180 response on the interface.</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">We don’t have errors on the interface, firewall is disabled , seems there's no packet lost (checked with ping with low interval ) , and routes are ok … </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">By our tests we can see there is a direct connection between the mass of the calls, and between the lost of sip 180 responses.</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">We're using Asterisk 1.4.4, with real-time configuration, also we made few *<b>modifications</b>* in asterisk source code (changed </span><span style="COLOR: blue">app_dial.c, /app_macro.c, /func_cdr.c</span><span style="FONT-SIZE: 12pt">)…</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">We're not sure if the problem on the OS Level (Centos 5.2) or in the asterisk application.</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">Please assist…</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt">~Nir</span></p>
<p style="TEXT-ALIGN: left"><span style="FONT-SIZE: 12pt"> </span></p>
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