<p>Need add<br>
_tmx_tmb.prepare_to_cancel(t, &cancel_data.cancel_bitmap, 0);</p>
<p>into function static int t_cancel_branches_helper(sip_msg_t* msg, int n)</p>
<p>at case of 2( "this")</p>
<p>proposed changes:</p>
<pre><code>
                case 2:
                        /* prepare cancel for current branch (idx) */
                        if(msg->first_line.u.reply.statuscode>=200)
                                break;
                        cancel_data.cancel_bitmap = 1<<idx;
+                        _tmx_tmb.prepare_to_cancel(t, &cancel_data.cancel_bitmap, 0);
                        break;
</code></pre>
<h3>Additional Information</h3>
<p>kamailio version 4.* to 5.*</p>
<pre><code></code></pre>
<p>Without this it can't cancel "this" transaction.</p>
<p>Rare case due to low use of "this".</p>

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