<div dir="auto">Hi Guillermo,<div dir="auto"><br><div dir="auto">It all depends on the implementation of SIPGW. And as we all know SIP has remained quiet non standard across vendor and that's where SBC came into picture.</div><div dir="auto"><br></div><div dir="auto">I have worked with couple of them and most of them use 183 for Early Media, e.g. Ringtone, MoH, Caller tune etc. SDP in 200OK is still expected for actual speech codecs for speech path. </div><div dir="auto"><br></div><div dir="auto">You can get more info on this RFC 4566 and 3264.</div><div dir="auto"><br></div><div dir="auto">Take care!</div><div dir="auto">Jubin</div><div dir="auto"><br></div><div dir="auto"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 20 Jun, 2019, 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:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">Hi fellows,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">Flow:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d">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:#1f497d">B<-183 WITH SDP<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d">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:#1f497d">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:#1f497d">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:#1f497d">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:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">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:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d">Guillermo<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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