<div dir="ltr">Hello Bogdan,<div><br></div><div>In my case, ACK for previous INVITE has already been received by OpenSIPS, but not sent yet. </div><div>In this case, will the variable $DLG_status still equals 3 ?</div><div><br></div><div>Thanks</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Feb 5, 2017 at 11:15 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 bgcolor="#FFFFFF" text="#000000">
<tt>Hi Stas,<br>
<br>
Such races may happen at application level or even at network
level (when using UDP) - so if you have 2 packets very close as
time, they may swap. That is SIP :)<br>
<br>
The full guilt is in the UAC device, IMHO - it should let some
time gap between the ACK and re-INVITE, to eliminate any possible
races.<br>
<br>
Now, what you can do is to use the dialog module and to check the
dialog state when receiving the re-invite. If $DLG_status is </tt><tt><span class="m_-8994335413096070854emphasis"><em>3</em></span> (Confirmed by a final reply
but no ACK received yet), drop with no reply the re-INVITEs (to
force a later retransmission) :<br>
<a class="m_-8994335413096070854moz-txt-link-freetext" href="http://www.opensips.org/html/docs/modules/2.2.x/dialog.html#id297400" target="_blank">http://www.opensips.org/html/<wbr>docs/modules/2.2.x/dialog.<wbr>html#id297400</a><br>
<br>
Regards,<br>
</tt>
<pre class="m_-8994335413096070854moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="m_-8994335413096070854moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.<wbr>com</a></pre><span class="">
<div class="m_-8994335413096070854moz-cite-prefix">On 02/02/2017 10:31 PM, Stas Kobzar
wrote:<br>
</div>
</span><blockquote type="cite"><div><div class="h5">
<div dir="ltr"><font face="monospace, monospace">Hello List,</font>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">My call flow has initial
INVITE and re-INVITE to update RTP IP/port.</font></div>
<div><font face="monospace, monospace">Usually everything works
well, but sometimes OpenSIPS come up with following example:</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">UA
OpenSIPS PSTN GW</font></div>
<div><font face="monospace, monospace">------------------------------<wbr>-------------</font></div>
<div><font face="monospace, monospace">INV(CSeq: 100) ----->
| ---> INV(CSeq: 100)</font></div>
<div><font face="monospace, monospace"><---- 200 OK
| <--- 200 OK</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">(UA sends ACK then new
INVITE)</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">ACK(CSeq: 100) ----->
|</font></div>
<div><font face="monospace, monospace">reINV(Cseq: 101) --->
|</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">(OpenSIPS relays first
INVITE then ACK)</font></div>
<div><font face="monospace, monospace"> |
---> reINV(CSeq: 101)</font></div>
<div><font face="monospace, monospace"> |
---> ACK(CSeq: 100)</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">When PSTN gateway
receives re-INVITE before ACK for previous INVITE</font></div>
<div><font face="monospace, monospace">it responds 500 with
Retry-After header. </font></div>
<div><font face="monospace, monospace">This is correct behaviour
which conforms to the RFC 3261 section 14.2</font></div>
<div><font face="monospace, monospace"><br>
</font></div>
<div><font face="monospace, monospace">My question is:<br>
</font></div>
<div><font face="monospace, monospace">Is it possible to assure
order of received and relayed messages within the same SIP
session? Is there any configuration parameter?</font></div>
<div><font face="monospace, monospace"> <br>
</font></div>
<div>
<div><font face="monospace, monospace">Thank you,</font></div>
-- <br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:15px;font-family:Arial;color:rgb(0,112,192);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Stas Kobzar</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:Arial;color:rgb(166,166,166);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Developeur VoIP / VoIP Developer</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><br></p></span><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,112,192);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Modulis.ca Inc.</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:12px;font-family:Arial;color:rgb(0,0,0);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent"># Bureau / Office: 514-284-2020 x 246</span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-size:11px;font-family:Arial;color:rgb(0,0,0);font-weight:bold;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">Email</span><span style="font-size:11px;font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap;background-color:transparent">: </span><span style="text-decoration:underline;font-size:11px;font-family:Arial;color:rgb(17,85,204);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><a href="http://firstname.lastname" style="text-decoration:none" target="_blank">s</a>tas.kobzar</span><a style="text-decoration:none"><span style="font-size:11px;font-family:Arial;color:rgb(17,85,204);text-decoration:underline;vertical-align:baseline;white-space:pre-wrap;background-color:transparent">@modulis.ca</span></a></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="font-family:Arial;color:rgb(0,0,0);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"> </span></p><p dir="ltr" style="line-height:1.15;margin-top:0pt;margin-bottom:0pt"><span style="text-decoration:underline;font-size:11px;font-family:Arial;color:rgb(17,85,204);vertical-align:baseline;white-space:pre-wrap;background-color:transparent"><a href="https://www.modulis.com/" style="text-decoration:none" target="_blank">https://www.modulis.com</a></span></p></div></div></div></div></div></div></div></div></div>
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