<div dir="ltr">Hi Bogdan,<div><br></div><div>Thanks for your reply. </div><div><br></div><div>I am trying to manipulate the CSeq header. </div><div><br></div><div>I have attached a packet trace. </div><div><br></div><div>In the example 10.216.235.38 sends a SIP Invite to 10.216.235.37 via Opensips. Then 10.216.235.37 challenges authentication. In the second SIP Invite that contains the authentication info (frame number 6), I have to increment the CSeq header otherwise 10.216.235.37 does not like it. The new CSeq is now set to 2. </div><div><br></div><div>If 10.216.235.37 is not able to accept the call, it returns something other than "200 OK" (606 in this example). Now it is the problem. Opensips sends back an ACK (frame number 12) with CSeq set to 1 (not 2). 10.216.235.37 is expecting an ACK with a CSeq set to 2. The consequence is that 10.216.235.37 keeps sending 606 until times out. </div><div><br></div><div>The ACK is internally generated by Opensips and as you said we can not manipulate it. I am wondering if there is any way to solve this problem. </div><div><br></div><div>PS: 10.216.235.97 is the internal IP of Opensips server and 10.216.235.74 is the external IP. </div><div><br></div><div>Thanks,</div><div>Ping</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jun 4, 2015 at 12:55 AM, Bogdan-Andrei Iancu <span dir="ltr"><<a href="mailto:bogdan@opensips.org" target="_blank">bogdan@opensips.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<tt>Hi Ping,<br>
<br>
There is no access to internally generated ACK and CANCEL
requests.<br>
<br>
What are you trying to do ?<br>
<br>
Regards,<br>
</tt>
<pre cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.com</a></pre><div><div class="h5">
<div>On 03.06.2015 02:53, Ping Han wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">Hi,<br>
<br>
With Opensips is there a way to manipulate the SIP headers of a
messages that are generated locally by Opensips. See the example
below.<br>
<br>
--------------------------------------------<br>
ACK <a href="http://sip:0370103204@192.168.100.37:5060" target="_blank">sip:0370103204@192.168.100.37:5060</a>
SIP/2.0<br>
Via: SIP/2.0/UDP
192.168.100.74:5060;branch=z9hG4bK5094.3ee05403.1<br>
From:<<a href="mailto:sip%3A0370103401@xxxvoip.com" target="_blank">sip:0370103401@xxxvoip.com</a>>;tag=1740643510<br>
Call-ID: <a href="mailto:641613075@192.168.100.38" target="_blank">641613075@192.168.100.38</a><br>
To:<<a href="http://sip:0370103204@192.168.100.37:5060" target="_blank">sip:0370103204@192.168.100.37:5060</a>>;tag=1994410995-1432625097305;<br>
CSeq: 1 ACK<br>
Max-Forwards: 70<br>
User-Agent: OpenSIPS (2.1.0 (x86_64/linux))<br>
Content-Length: 0<br>
--------------------------------------------<br>
<br>
Thanks,<br>
Ping Han</div>
<br>
<fieldset></fieldset>
<br>
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</blockquote>
<br>
</div>
</blockquote></div><br></div>