<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">In the above call flow, 'B' is at fault as it is not answering the SDP offer it received in INVITE from 'A'. and this is the reason, you are having audio issues as A doesn't have media info of B. 'A' should not ACK the 200 OK as it doesn't contain the SDP.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I believe 'B should sent the answer in either in provisional response or in 200 OK. RFC 6337 section 3.1.1 have the detail on UAS behavior in this scenario.</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><font face="verdana, sans-serif">Thanks,</font><div><font face="verdana, sans-serif">Amanpreet Singh. </font></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 20, 2019 at 11:09 PM Zuñiga, Guillermo <<a href="mailto:Guillermo.Zuniga@cwpanama.com">Guillermo.Zuniga@cwpanama.com</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">
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<p class="gmail-m_-9076598311661967096f1fd8ef2-de04-4a74-a01f-b952c9aa1b3b"></p>
<div class="gmail-m_-9076598311661967096WordSection1">
<p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Hi fellows,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">I would like to know the following:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">I am having the following flow and I would like to know if is a valid flow and if the remote SIPGW should be able to handle or complete this dialog when receive a
200OK without SDP to the INVITE.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Flow:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">A ->INVITE with SDP<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:283.2pt"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">B<-TRYING<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:283.2pt"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">B<-183 WITH SDP<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">A->PRACK<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">B<-200OK TO THE PRACK<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">B<-180 RINGING WITHOUT SDP<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">B<-200OK WITHOUT SDP TO THE INVITE.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">A->ACK TO THE 200OK WITHOUT SDP TO THE INVITE.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">My question comes, cause I am having audio issue with the client is calling us and here I would like to know if could be related that I am sending the 200OK without
SDP. Or he should be able to complete the dialog cause previous to the 200OK without SDP I sent a 183 with SDP?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Please let me know any comments or where in the RFC I can look for that describe this behavior.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Guillermo<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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</span></p><table style="font-size:8pt;font-family:Verdana;color:rgb(0,0,0)" cellpadding="0" cellspacing="0" class="gmail-m_-9076598311661967096f1fd8ef2-de04-4a74-a01f-b952c9aa1b3bTable">
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<span style="font-family:futura;font-size:small;font-weight:bold">Guillermo Zuniga</span></td>
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<span style="font-family:"Futura Bk BT";font-size:x-small;color:rgb(0,0,0);font-weight:normal">Gerencia de Soporte Técnico</span></td>
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