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<tt>Hi Ben,<br>
<br>
Thanks for the report - could you please open a bug report on
GITHUB with the relevant information ? It will be easier for us to
track it.<br>
<br>
Best regards,<br>
</tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="https://www.opensips-solutions.com">https://www.opensips-solutions.com</a>
OpenSIPS Summit 2019
<a class="moz-txt-link-freetext" href="https://www.opensips.org/events/Summit-2019Amsterdam/">https://www.opensips.org/events/Summit-2019Amsterdam/</a>
</pre>
<div class="moz-cite-prefix">On 12/05/2018 05:17 PM, Ben Newlin
wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have found
an issue with using the UAC module to replace the From/To
headers. When one of these headers is the last header in a
SIP INVITE, the UAC module is injecting an extra line break
in subsequent CANCEL requests causing an invalid request.
This happens when either of these headers are the last
header in the originally received INVITE, but also if they
become the last header due to modifications made to the
original INVITE, e.g. if the last 2 headers were To followed
by P-Asserted-Identity and the script processing calls
remove_hf(“P-Asserted-Identity”) thus making the To header
last.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have only
seen this happen on a CANCEL request. Other sequential
requests like BYE or re-INVITE are not malformed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">A tcpdump
capture of the message sequence can be found here:
<a href="https://pastebin.com/myDVU5Jz"
moz-do-not-send="true">https://pastebin.com/myDVU5Jz</a>.
Note the extra whitespace line in the second CANCEL message
forwarded from OpenSIPS (203.0.113.3).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Ben
Newlin </span>
<o:p></o:p></p>
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