<div dir="ltr">Hi Daniel,<div><br></div><div>I send you the pcap files on both client and server side.</div><div>Analyse this files, I see the packet can not "reassemble" INVITE message at server side:</div><div>- At client.pcapng, it can detect 6 and 7th packets are one.</div><div>- But on server.pcap, it can not "reassemble" 18 and 21st packets.</div><div><br></div><div>I just explain as my understand. If you have any information, please ask me.</div><div>I think the problem relate the MTU - fragmentation. But I'm not sure about this.</div><div>Thank you for support !</div><div><br></div><div>Regards,</div><div>Hai Bui</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 22, 2017 at 4:33 PM, Hai Bui Duc Ha <span dir="ltr"><<a href="mailto:hai.bui@htklabs.com" target="_blank">hai.bui@htklabs.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Hi <span class="m_4382236726686197603gmail-gI"></span><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD">Daniel,<br><br></span></span></div><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD">Thank for your advice.<br></span></span></div><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD">I will capture and analyze the call log on both client and kamailio to check the packet size.<br><br></span></span></div><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD">Regards,<br></span></span></div><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD">Hai Bui<br></span></span><div><div><span class="m_4382236726686197603gmail-gI"><span name="Daniel-Constantin Mierla" class="m_4382236726686197603gmail-gD"><br></span></span></div></div></div><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Fri, Jan 20, 2017 at 3:38 PM, Daniel-Constantin Mierla <span dir="ltr"><<a href="mailto:miconda@gmail.com" target="_blank">miconda@gmail.com</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"><span>
<p><br>
</p>
<br>
<div class="m_4382236726686197603m_-3818873944372116824moz-cite-prefix">On 19/01/2017 22:56, Daniel-Constantin
Mierla wrote:<br>
</div>
<blockquote type="cite">
<p>Hello,<br>
</p>
<br>
<div class="m_4382236726686197603m_-3818873944372116824moz-cite-prefix">On 19/01/2017 10:48, Hai Bui Duc Ha
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>
<div>Hi Daniel,<br>
<br>
</div>
Thank you for reply.<br>
</div>
<br>
<div class="gmail_extra">
<div class="gmail_quote">On Tue, Jan 17, 2017 at 6:05 PM,
Daniel-Constantin Mierla <span dir="ltr"><<a href="mailto:miconda@gmail.com" target="_blank">miconda@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Hello,</p>
<p>apparently I missed the follow ups on this
discussion, dragged in by other topics on mailing
list. <br>
</p>
</div>
</blockquote>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Can you get the pcap with all the traffic taken on
kamailio server for the call (from initial invite to
the end of the call)?</p>
</div>
</blockquote>
<div>I send you the pcap at enclosed file. You can see the
packet <b>No.5 </b>, it missing SIP message body:<br>
<i><b> Media Attribute (a): rtpmap:8
PCMA/8000</b></i>
<div><i><b> Media Attribute (a): rtpmap:101
telephone-event/8000</b></i></div>
<div><i><b> Media Attribute (a): fmtp:101
0-16</b></i></div>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p> I expect that content length is mismatching or
there is a '\0' inside the sdp.</p>
</div>
</blockquote>
<div>Can you explain me more about this ? <br>
</div>
</div>
</div>
</div>
</blockquote>
TCP is a stream protocol, meaning that the application (kamailio)
need to read and parse to figure out the end of a SIP message. The
state machine as per RFC requires the application to read and
identify the Content-Length header, take its value, read until the
end of headers is found (an empty line) and from there on read as
much as the value of Content-Length to get the body and consider
the end of message there.<br>
<br>
If the sending application puts a lower value in the
Content-Length than the number of chars in the body, the rest
remains in the buffer and the receiving application (kamailio)
attempts to parse a new SIP message.<br>
<br>
The other thing I was thinking of was the presence of '\0' which
marks the end of string in C.<br>
<br>
I will look at the pcap very soon and see what I find there.<br>
<br>
</blockquote></span>
The problem is the value of Content-Lenght set by the client -- it
is set only to the size that it is view as part of the invite. A bit
later the client sends more sdp, but exceeding the size sent in C-L
header. That part of SDP remains as garbage.<br>
<br>
So there is a bug in client app.<span><br>
<br>
Cheers,<br>
Daniel<br>
<pre class="m_4382236726686197603m_-3818873944372116824moz-signature" cols="72">--
Daniel-Constantin Mierla
<a class="m_4382236726686197603m_-3818873944372116824moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" target="_blank">www.twitter.com/miconda</a> -- <a class="m_4382236726686197603m_-3818873944372116824moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" target="_blank">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 8-10, 2017 - <a class="m_4382236726686197603m_-3818873944372116824moz-txt-link-abbreviated" href="http://www.kamailioworld.com" target="_blank">www.kamailioworld.com</a></pre>
</span></div>
</blockquote></div><br><br clear="all"><br></div></div><span class="">-- <br><div class="m_4382236726686197603gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Hai Bui<br></div><div>VoIP engineer, Cvoice team, HTK-HCM Office<br></div><div><div dir="ltr"><span><font color="#888888"><div>
<font color="#000066">Mobile: +84-165-618-9876<br></font></div><div><font color="#000066"></font><div><font color="#000066"></font></div></div></font></span></div></div></div></div></div></div></div></div>
</span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Hai Bui<br></div><div>VoIP engineer, Cvoice team, HTK-HCM Office<br></div><div><div dir="ltr"><span><font color="#888888"><div>
<font color="#000066">Mobile: +84-165-618-9876<br></font></div><div><font color="#000066"></font><div><font color="#000066"></font></div></div></font></span></div></div></div></div></div></div></div></div>
</div>