<div dir="ltr">Johan, is there also a PRACK happening in this call flow, but omitted from your diagram? The SDP offer/answer model is extended a bit by reliable provisional response messages.<div><br></div><div>The Offer/Answer Model and PRACK<br></div><div><a href="https://datatracker.ietf.org/doc/html/rfc3262#section-5">https://datatracker.ietf.org/doc/html/rfc3262#section-5</a><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><span><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima Nova",sans-serif;color:rgb(0,0,0);background-color:transparent;font-weight:800;vertical-align:baseline;white-space:pre-wrap"><br></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima Nova",sans-serif;color:rgb(0,0,0);background-color:transparent;font-weight:800;vertical-align:baseline;white-space:pre-wrap"><br></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima Nova",sans-serif;color:rgb(0,0,0);background-color:transparent;font-weight:800;vertical-align:baseline;white-space:pre-wrap">Calvin Ellison</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima Nova",sans-serif;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Systems Architect</span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima Nova",sans-serif;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><a href="mailto:calvin.ellison@voxox.com" target="_blank">calvin.ellison@voxox.com</a></span></p><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:10pt;font-family:"Proxima 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src="https://lh6.googleusercontent.com/skcophrAnEg1jyCTXau3hMbh0GF9b1TeZ-SdROEZ0OxxHuTRKGNTS_lYIh2LIdgJ6rLTL1LMUVOlhxrHm7hxZ6p8XfYovu7xd-tXhvU1OEm4Hi6niWF6Trr7EfMFqGoLNMMeyYqk" width="26" height="26" style="margin-left:0px;margin-top:0px"></span></span></a><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"> </span><a href="https://twitter.com/Voxox" target="_blank"><span style="font-size:12pt;font-family:"Proxima Nova",sans-serif;color:rgb(17,85,204);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><span style="border:none;display:inline-block;overflow:hidden;width:26px;height:26px"><img src="https://lh6.googleusercontent.com/-IAXOgfWybf32YI5OpWoYsxhr1Iq2lvdT8a7LDpiP9IIXDxWemvF2v-dQrQC7ZPDn6eQtNQav84fAm6w39EUMfUkEq9e-mebAWCw5F1g57C3UWrnxcLoJmnPxTsSec0vI-biI8J7" width="26" height="26" style="margin-left:0px;margin-top:0px"></span></span></a></p><br><p dir="ltr" style="line-height:1.38;margin-top:0pt;margin-bottom:0pt"><span style="font-size:9pt;font-family:"Helvetica Neue",sans-serif;color:rgb(153,153,153);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">The information contained herein is confidential and privileged information or work product intended only for the individual or entity to whom it is addressed. Any unauthorized use, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me immediately.</span></p></span></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Oct 1, 2021 at 8:07 AM johan <<a href="mailto:johan@democon.be">johan@democon.be</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Scenario is this <br>
</p>
<p><br>
</p>
<p>A ---> OPENSIPS and rtpengine -----> B <br>
</p>
<p> INV -> > INV</p>
<p> 183 sdp < <183 sdp</p>
<p> < 480</p>
<p>
-------------------------------------------------> Voicemail</p>
<p> > INV
<br>
</p>
<p> < 200
with diff sdp</p>
<p> 200 with diff sdp <</p>
<p>would giving rtpengine the port latching option fix this ? <br>
</p>
<p><br>
</p>
<p>wkr, <br>
</p>
<div>On 1/10/2021 16:41, Ben Newlin wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal">No, this is not allowed by the
specification, though some devices do handle it.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><a href="https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1" target="_blank">https://datatracker.ietf.org/doc/html/rfc3261#section-13.2.1</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal"><span style="color:black">Ben Newlin </span><u></u><u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class="MsoNormal" style="margin-bottom:12pt"><b><span style="font-size:12pt;color:black">From:
</span></b><span style="font-size:12pt;color:black">Users
<a href="mailto:users-bounces@lists.opensips.org" target="_blank"><users-bounces@lists.opensips.org></a> on behalf of
johan <a href="mailto:johan@democon.be" target="_blank"><johan@democon.be></a><br>
<b>Date: </b>Friday, October 1, 2021 at 10:35 AM<br>
<b>To: </b>OpenSIPS users mailling list
<a href="mailto:users@lists.opensips.org" target="_blank"><users@lists.opensips.org></a><br>
<b>Subject: </b>[OpenSIPS-Users] question on call
handling.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12pt">Dears,<br>
<br>
<br>
this is more a general sip question. when establishing a
dialog is it<br>
then allowed to change the sdp that you have sent in 183 to
somehting<br>
else in 200 Ok ?<br>
<br>
<br>
wkr,<br>
<br>
<br>
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</div>
</div>
<br>
<fieldset></fieldset>
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</pre>
</blockquote>
</div>
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