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<p><tt>Hi Rodrigo,</tt></p>
<p><br>
</p>
<p><tt>Just trying to understand the flow here - could it be
actually a Re-INVITE that goes through your sequential routing
block, thus lookup() is not called, leaving $avp(attr) NULL
throughout that transaction?<br>
</tt></p>
<p><tt><br>
</tt></p>
<p><tt>Regardless of the above, in OpenSIPS terms, each "branch"
points to a different destination. In our case, we're talking
about a retry, not a serial/parallel forked call. Which means
that you should only bother with $T_branch_idx if a lookup()
could yield more than one device to be contacted for the same
AoR.</tt></p>
<p><tt><br>
</tt></p>
<p><tt>Best regards,<br>
</tt></p>
<pre class="moz-signature" cols="72">Liviu Chircu
OpenSIPS Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
<div class="moz-cite-prefix">On 29.08.2017 18:05, Rodrigo Pimenta
Carvalho wrote:<br>
</div>
<blockquote type="cite"
cite="mid:DM5PR02MB321291E32C824C707B11D5D4B59F0@DM5PR02MB3212.namprd02.prod.outlook.com">
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</p>
<p>Dear SIPusers,</p>
<p><br>
</p>
<p>In my project I use to keep a valuable information in table
location. This is about the state of a subscriber's
localization.</p>
<p>I have to read such information for the callees, every time a
new branch is created and every time a INVITE is answered with
SIP OK.</p>
<p>So, my OpenSIPS configuration has something similar to the
following code:</p>
<p><br>
</p>
<p><span>1 route{</span></p>
<p>2 ... // hidden code for simplification.<br>
</p>
<p>3 <span>lookup("location","m")</span></p>
<p>4 ...<br>
</p>
<p>5 <span> route(relay);</span><br>
</p>
<p>6 }</p>
<p><br>
</p>
<p><span>7 route[relay]</span>{</p>
<div>8 if (is_method("INVITE"))
{
<br>
9 ...<br>
10
t_on_branch("per_branch_ops");
<br>
11
t_on_reply("handle_nat");
<br>
12
t_on_failure("missed_call");
<br>
13 } </div>
14 ...
<p>15 }</p>
<p><br>
</p>
<p><span>16 branch_route[per_branch_ops] { <br>
17 ....</span></p>
<p><span><span>18 $(avp(attr)[$T_branch_idx])</span><br>
</span></p>
<p><span>19 ...<br>
</span></p>
<p><span>20 }</span></p>
<p><span><br>
</span></p>
<p><span><span>21 onreply_route[handle_nat] {</span><br>
</span></p>
<p><span>22 ...</span></p>
<p><span>23 <span>$(avp(attr)[$T_branch_idx])</span><br>
</span></p>
<p><span>24 ...<br>
</span></p>
<p><span>25 }</span></p>
<p>26 ...<br>
</p>
<p><br>
</p>
<p>In a determined call, when the OpenSIPS receives the INVITE
and then a SIP OK (200), the code gets right value in lines 18
and 23.</p>
<p>In such call, the SIP OK (from callee) offers a kind of video
that the caller can't support. In this case the caller sends
another SIP INVITE with inactive video (SDP).</p>
<p>In this moment, OpenSIPS gets this second INVITE and create a
new branch.</p>
<p>However, for this new branch, lines 18 and 23 give me NULL
for <span><span>$(avp(attr)[$T_branch_idx])</span></span>.</p>
<p><br>
</p>
<p>How to solve this issue?</p>
<p><br>
</p>
<p>Any hint will be very helpful!!</p>
<p><br>
</p>
<p>Best regards!</p>
<p><br>
</p>
<p>P.S.: I'm not expert in SIP.<br>
</p>
<p><br>
</p>
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<div class="BodyFragment"><font size="2">
<div class="PlainText">RODRIGO PIMENTA CARVALHO<br>
Inatel Competence Center<br>
Software<br>
Ph: +55 35 3471 9200 RAMAL 979<br>
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</pre>
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