<div dir="ltr">Hey Guillermo,<br><br>As per RFC 3261 , Section <a class="gmail-selflink" name="section-13.2.1" href="https://tools.ietf.org/html/rfc3261#section-13.2.1" style="font-size:1em;font-weight:bold;color:black;text-decoration-line:none">13.2.1</a><span style="font-size:1em;font-weight:bold;color:rgb(0,0,0)"> Creating the Initial INVITE, PAGE 79, first statement </span><div><font color="#000000"><b><br></b></font></div><div><font color="#000000"><b>"</b></font><span style="color:rgb(0,0,0);font-size:13.3333px">If the initial offer is in an INVITE, the answer MUST be in a </span><span style="color:rgb(0,0,0);font-size:13.3333px"> reliable non-failure message from UAS back to UAC which is </span><span style="color:rgb(0,0,0);font-size:13.3333px"> correlated to that INVITE. For this specification, that is </span><span style="color:rgb(0,0,0);font-size:13.3333px"> only the final 2xx response to that INVITE. That same exact </span><span style="color:rgb(0,0,0);font-size:13.3333px">answer MAY also be placed in any provisional responses sent</span><span style="color:rgb(0,0,0);font-size:13.3333px"> prior to the answer. The UAC MUST treat the first session </span><span style="color:rgb(0,0,0);font-size:13.3333px">description it receives as the answer, and MUST ignore any </span><span style="color:rgb(0,0,0);font-size:13.3333px">session descriptions in subsequent responses to the initial I</span><span style="color:rgb(0,0,0);font-size:13.3333px">NVITE."</span></div><div><font color="#000000"><span style="font-size:13.3333px"><br></span></font></div><div><font color="#000000"><span style="font-size:13.3333px">Hence , it says that 183 Provisional response are considered as a final answer and , not mandatory to send 200OK with SDP.</span></font></div><div><font color="#000000"><span style="font-size:13.3333px"><br></span></font></div><div>for any further clarification you raise concern.</div><div><br></div><div>regards,</div><div><div><div>Nitin Maru</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 21, 2019 at 10:54 PM <<a href="mailto:discussion-request@sipforum.org">discussion-request@sipforum.org</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">Send discussion mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: SIP Flow with a 200OK(without SDP) to the INVITE (Zu?iga)<br>
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Message: 1<br>
Date: Thu, 20 Jun 2019 18:21:54 +0000<br>
From: Zu?iga, Guillermo <<a href="mailto:Guillermo.Zuniga@cwpanama.com" target="_blank">Guillermo.Zuniga@cwpanama.com</a>><br>
To: AMIT ANAND <<a href="mailto:amiit.anand@gmail.com" target="_blank">amiit.anand@gmail.com</a>><br>
Cc: "<a href="mailto:discussion@sipforum.org" target="_blank">discussion@sipforum.org</a>" <<a href="mailto:discussion@sipforum.org" target="_blank">discussion@sipforum.org</a>><br>
Subject: Re: [SIPForum-discussion] SIP Flow with a 200OK(without SDP)<br>
to the INVITE<br>
Message-ID:<br>
<<a href="mailto:948388ccbbfa48ea8b8b4326257472a6@CWP-JFR-EXC01.cwpanama.com" target="_blank">948388ccbbfa48ea8b8b4326257472a6@CWP-JFR-EXC01.cwpanama.com</a>><br>
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<br>
Good,<br>
<br>
Thanks for that info.<br>
<br>
Regards,<br>
Guillermo<br>
<br>
De: AMIT ANAND [mailto:<a href="mailto:amiit.anand@gmail.com" target="_blank">amiit.anand@gmail.com</a>]<br>
Enviado el: Thursday, June 20, 2019 1:16 PM<br>
Para: Zu?iga, Guillermo<br>
CC: <a href="mailto:discussion@sipforum.org" target="_blank">discussion@sipforum.org</a><br>
Asunto: Re: [SIPForum-discussion] SIP Flow with a 200OK(without SDP) to the INVITE<br>
<br>
Hey Guillermo,<br>
<br>
Since the offer is already answered in 183 it does not need to send SDP in 200OK. Although majority of devices send SDP in 183 and 200OK as well. But its not mandatory, look for offer answer model for more details. It asks answer to come in reliable response and since the 183 is followed by PRACK thus reliable response is maintained so SDP in 183 could be consider as final answer.<br>
<br>
Cheers<br>
Amit<br>
<br>
On Thu, Jun 20, 2019 at 10:39 AM Zu?iga, Guillermo <<a href="mailto:Guillermo.Zuniga@cwpanama.com" target="_blank">Guillermo.Zuniga@cwpanama.com</a><mailto:<a href="mailto:Guillermo.Zuniga@cwpanama.com" target="_blank">Guillermo.Zuniga@cwpanama.com</a>>> wrote:<br>
<br>
Hi fellows,<br>
<br>
I would like to know the following:<br>
<br>
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.<br>
<br>
Flow:<br>
A ->INVITE with SDP<br>
B<-TRYING<br>
B<-183 WITH SDP<br>
A->PRACK<br>
B<-200OK TO THE PRACK<br>
B<-180 RINGING WITHOUT SDP<br>
B<-200OK WITHOUT SDP TO THE INVITE.<br>
A->ACK TO THE 200OK WITHOUT SDP TO THE INVITE.<br>
<br>
<br>
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?<br>
<br>
Please let me know any comments or where in the RFC I can look for that describe this behavior.<br>
<br>
Regards,<br>
Guillermo<br>
<br>
<br>
<br>
Guillermo Zuniga<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div><div>Thanks & Regards,<br></div><span style="background-color:rgb(0,0,255)"><span style="color:rgb(102,102,102)"><font size="4"><span style="color:rgb(0,0,255)"><span style="background-color:rgb(243,243,243)">Nitin Maru</span></span><br></font></span></span></div><font color="#0b5394" face="verdana, sans-serif"><b><font size="2">MOBILE. </font></b></font><b>9904600076<br></b></div><b><span style="color:rgb(0,255,255)">SKYPE</span> : nitinmaru@Hotmail.com<br></b><br></div></div>