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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi</div>
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</p>
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A follow up question on a almost one year old case.</p>
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<br>
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t_cancel_callid() is still working good.</p>
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<br>
</p>
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However, a new calling scenario towards the same system just got me another issue. </p>
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<br>
</p>
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The Cancel request generated by <span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">t_cancel_callid()<span class="Apple-converted-space"> is not accepted by this old
legacy system.</span></span></p>
<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(32,31,30); text-align:start; background-color:rgb(255,255,255)">
<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space">I have not yet confirmed it, but it looks like the only difference form other
Cancel request is that <span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">t_cancel_callid() generates a Cancel with a Contact header.</span></span></span></p>
<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(32,31,30); text-align:start; background-color:rgb(255,255,255)">
<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space"><span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></span></span></p>
<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(32,31,30); text-align:start; background-color:rgb(255,255,255)">
<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space"><span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Should
the Contact header really be inside the Cancel request?</span></span></span></p>
<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(32,31,30); text-align:start; background-color:rgb(255,255,255)">
<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space"><span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Is
it possible to disable it?</span></span></span></p>
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<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space"><span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></span></span></p>
<p style="margin:0cm 0cm 0.0001pt; font-size:11pt; font-family:Calibri,sans-serif; color:rgb(32,31,30); text-align:start; background-color:rgb(255,255,255)">
Running Kamailio 5.3.6</p>
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<br>
</p>
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Best Regards,</p>
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Lars</p>
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<span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span class="Apple-converted-space"><span style="caret-color: rgb(32, 31, 30); font-family: Calibri, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></span></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Lars Olsson <lars.olsson@optimobile.se><br>
<b>Sent:</b> Saturday, October 26, 2019 4:10 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>; miconda@gmail.com <miconda@gmail.com><br>
<b>Subject:</b> Re: [SR-Users] Rewrite BYE to Cancel</font>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hi all,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I just want to report back. </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Daniels suggestion worked great!</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Thanks a lot for your input.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
On the "incorrect" BYE request, trigger a cancel for the INVITE with t_cancel_callid() using call-id and cseq of the INVITE request. (Cseq was not the same on INVITE and BYE).<br>
Then reply with 200 OK to the BYE message.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Cheers,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Lars</div>
<div id="x_appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Daniel-Constantin Mierla <miconda@gmail.com><br>
<b>Sent:</b> Friday, October 25, 2019 1:32 PM<br>
<b>To:</b> Lars Olsson <lars.olsson@optimobile.se>; Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> Re: [SR-Users] Rewrite BYE to Cancel</font>
<div> </div>
</div>
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<p style="margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;">
Run with debug=3 and see if you get other log messages from t_cancel_callid() execution.</p>
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<br>
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Cheers,<br>
Daniel</p>
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<br>
</p>
<div class="x_x_moz-cite-prefix">On 25.10.19 13:09, Lars Olsson wrote:<br>
</div>
<blockquote type="cite">
<div>Sorry for forgetting to that result:</div>
<div>ERROR: <script>: Failed to cancel transaction</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Daniel-Constantin Mierla
<a class="x_x_moz-txt-link-rfc2396E" href="mailto:miconda@gmail.com"><miconda@gmail.com></a><br>
<b>Sent:</b> Friday, October 25, 2019 1:08 PM<br>
<b>To:</b> Lars Olsson <a class="x_x_moz-txt-link-rfc2396E" href="mailto:lars.olsson@optimobile.se">
<lars.olsson@optimobile.se></a>; Kamailio (SER) - Users Mailing List <a class="x_x_moz-txt-link-rfc2396E" href="mailto:sr-users@lists.kamailio.org">
<sr-users@lists.kamailio.org></a><br>
<b>Subject:</b> Re: [SR-Users] Rewrite BYE to Cancel</font>
<div> </div>
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<p style="margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;">
Hello,</p>
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<br>
</p>
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which of the xlog messages were printed?</p>
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<br>
</p>
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Cheers,<br>
Daniel</p>
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<br>
</p>
<div class="x_x_x_moz-cite-prefix">On 25.10.19 13:04, Lars Olsson wrote:<br>
</div>
<blockquote type="cite">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Hi Daniel,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Thanks for your reply.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Used the following script for testing:</div>
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</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span>if (is_method("BYE")) {<br>
</span>
<div><br>
</div>
<div> xlog("CALLID: $ci\n");<br>
</div>
<div> xlog("CSEQ: $cs\n");<br>
</div>
<div><br>
</div>
<div> if (t_cancel_callid("$ci", "$cs", "0")) {<br>
</div>
<div> xlog("Transaction cancelled\n");<br>
</div>
<div> } else {<br>
</div>
<div> xlog("Failed to cancel transaction\n");<br>
</div>
<div> }<br>
</div>
<div> send_reply("200", "OK");<br>
</div>
<div> exit;<br>
</div>
<div>}<br>
</div>
<span></span><br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
No cancel message was triggered.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Best Regards,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Lars</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Daniel-Constantin Mierla
<a class="x_x_x_moz-txt-link-rfc2396E" href="mailto:miconda@gmail.com"><miconda@gmail.com></a><br>
<b>Sent:</b> Friday, October 25, 2019 12:32 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <a class="x_x_x_moz-txt-link-rfc2396E" href="mailto:sr-users@lists.kamailio.org">
<sr-users@lists.kamailio.org></a>; Lars Olsson <a class="x_x_x_moz-txt-link-rfc2396E" href="mailto:lars.olsson@optimobile.se">
<lars.olsson@optimobile.se></a><br>
<b>Subject:</b> Re: [SR-Users] Rewrite BYE to Cancel</font>
<div> </div>
</div>
<div style="background-color:#FFFFFF">
<p style="margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;">
Hello,</p>
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<br>
</p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;">
actually sending BYE for an in-progress call setup (initial INVITE routed, but 200ok was not received yet) is valid from SIP RFC point of view. So it is not really a broken implementation (or, not to put all my money in, it can be, but not because of this kind
of BYE).</p>
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<br>
</p>
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Practically the BYE can be used to terminate a specific branch in a call setup. Think about parallel forking, and many branches start sending back 183. The caller UA can send BYE to some of the branches and let the others wait to complete.</p>
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<br>
</p>
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The CANCEL has to be used when all the branches should be terminated. If there is a single branch, then the BYE terminates the call in progress, I am not sure what the callee UA should reply to the INVITE.</p>
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<br>
</p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;margin-top: 0px; margin-bottom: 0px;">
On the other hand, in the very few cases when I saw UAs sending BYE for early call setup, the other side was rejecting it, expecting the cancel.</p>
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<br>
</p>
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I expect it should work with kamailio to send 200ok for such BYE and then use t_cancel_callid():</p>
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<br>
</p>
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<a href="https://www.kamailio.org/docs/modules/stable/modules/tmx.html#tmx.f.t_cancel_callid">https://www.kamailio.org/docs/modules/stable/modules/tmx.html#tmx.f.t_cancel_callid</a></p>
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<br>
</p>
<div class="x_x_x_x_moz-cite-prefix">The call-id and cseq values should be the same in the BYE request.</div>
<div class="x_x_x_x_moz-cite-prefix"><br>
</div>
<div class="x_x_x_x_moz-cite-prefix">Try it and write back if works, I am quite curious about...<br>
</div>
<div class="x_x_x_x_moz-cite-prefix"><br>
</div>
<div class="x_x_x_x_moz-cite-prefix">Cheers,<br>
Daniel</div>
<div class="x_x_x_x_moz-cite-prefix"><br>
</div>
<div class="x_x_x_x_moz-cite-prefix">On 25.10.19 12:17, Lars Olsson wrote:<br>
</div>
<blockquote type="cite">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Yes it is a BROKEN behavior from the remote system, unfortunately it can not be changed.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Besides this issue, the remote system works as it should.</span><br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">A custom b2bua can for sure resolve this, but perhaps not in a standard way.</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Question is if it is possible to resolve with Kamailio or if I need to patch SEMS to handle this.</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Something like this:</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
if ("BYE" && dialog not confirmed)</div>
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reply back 200 OK</div>
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cancel other side of dialog</div>
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As Kamailio can terminate active dialog with sending bye in both directions, I thought that it might be possible to resolve this as well. <span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Hence asking for ideas.</span></div>
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Best Regards,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Lars</div>
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<div id="x_x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> sr-users
<a class="x_x_x_x_moz-txt-link-rfc2396E" href="mailto:sr-users-bounces@lists.kamailio.org">
<sr-users-bounces@lists.kamailio.org></a> on behalf of Steve Davies <a class="x_x_x_x_moz-txt-link-rfc2396E" href="mailto:steve-lists-srusers@connection-telecom.com">
<steve-lists-srusers@connection-telecom.com></a><br>
<b>Sent:</b> Friday, October 25, 2019 11:25 AM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <a class="x_x_x_x_moz-txt-link-rfc2396E" href="mailto:sr-users@lists.kamailio.org">
<sr-users@lists.kamailio.org></a><br>
<b>Subject:</b> Re: [SR-Users] Rewrite BYE to Cancel</font>
<div> </div>
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<div>
<div dir="ltr">Hi,
<div><br>
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<div>I'm normally a bystander. But on this occasion I've got to comment - there are broken SIP implementations, and there are BROKEN ones. Surely there is no hope with this one? If they can't get this right just imagine how many more problems it will have.</div>
<div><br>
</div>
<div>Steve</div>
<div><br>
</div>
</div>
<br>
<div class="x_x_x_x_x_gmail_quote">
<div dir="ltr" class="x_x_x_x_x_gmail_attr">On Fri, 25 Oct 2019 at 11:19, Lars Olsson <<a href="mailto:lars.olsson@optimobile.se">lars.olsson@optimobile.se</a>> wrote:<br>
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solid rgb(204,204,204); padding-left:1ex">
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
hi,</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I have a Kamailio setup infront of a SIP system that do not handle cancellation of a INVITE correctly.</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
The system sends out a BYE request instead of a Cancel request on non connected dialogs.</div>
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<br>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
I am trying to find a way to let Kamailio "translate" the BYE request to a Cancel reqeust for the ongoing INVITE dialog.</div>
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Alternative if SEMS b2bua can do it, but currently it replies: "not sip-relaying BYE in not connected dlg", and I have not found any obvious way to rewrite it there.</div>
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Any thoughts. I can not change the behavior of the remote system.</div>
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Best Regards,</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Lars</div>
</div>
_______________________________________________<br>
Kamailio (SER) - Users Mailing List<br>
<a href="mailto:sr-users@lists.kamailio.org" target="_blank">sr-users@lists.kamailio.org</a><br>
<a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users" rel="noreferrer" target="_blank">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a><br>
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<pre class="x_x_x_x_moz-quote-pre">_______________________________________________
Kamailio (SER) - Users Mailing List
<a class="x_x_x_x_moz-txt-link-abbreviated" href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a>
<a class="x_x_x_x_moz-txt-link-freetext" href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a>
</pre>
</blockquote>
<pre class="x_x_x_x_moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="x_x_x_x_moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="x_x_x_x_moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="x_x_x_x_moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany -- <a class="x_x_x_x_moz-txt-link-freetext" href="https://asipto.com/u/kat">https://asipto.com/u/kat</a></pre>
</div>
</blockquote>
<pre class="x_x_x_moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="x_x_x_moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="x_x_x_moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="x_x_x_moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany -- <a class="x_x_x_moz-txt-link-freetext" href="https://asipto.com/u/kat">https://asipto.com/u/kat</a></pre>
</div>
</blockquote>
<pre class="x_x_moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="x_x_moz-txt-link-abbreviated" href="http://www.asipto.com">www.asipto.com</a>
<a class="x_x_moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="x_x_moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training, Oct 21-23, 2019, Berlin, Germany -- <a class="x_x_moz-txt-link-freetext" href="https://asipto.com/u/kat">https://asipto.com/u/kat</a></pre>
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