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<p class="MsoNormal"><span style="color:#1F497D">Guillermo,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">This pattern of responses is valid but sometimes problematic. Many VoLTE devices will respond in this way, which is recommended in GSMA’s IR.92 specification.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Handling of ringback has become more complicated over time. In the early days of VoIP, we saw 2 main behaviors.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Devices would respond to an INVITE with a 180 without SDP, then provide the SDP answer in the 200 OK response to the INVITE. A UAC would generate ringing locally when it received a 180.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Switches would [usually] respond to an INVITE with a 183 with SDP, and later send the 200 OK response without SDP. The UAS would send ringback tone as early media, and the UAC would play that media
to its user.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In mobile networks this was not optimal. Option #1 provides the SDP answer very late, which can cause audio clipping because the access networks may not have time to establish a bearer to carrier the audio before
the audio starts to arrive. Option #2 is expensive since media has to be played across the network in order for the caller to hear ringing; and it isn’t supportable unless the UAS is a switch. So, a 3<sup>rd</sup> option was introduced. That 3<sup>rd</sup>
option is what you refer to below. The 183 response with SDP is sent early in the call flow (before beginning to alert the called user) in order to communicate the SDP answer to both access networks. The information in the SDP answer is needed in order to
create the bearer. Sending it “early” allows time for both access networks to allocate resources. A new header called P-Early-Media (RFC-5009) may be added to the 183, to clarify to the UAC whether to expect to subsequently receive early media. The default
is “no”, so usually that header is not sent in the scenario you describe. The 180 response is sent by the UAS when it begins to alert its user (i.e., begins to ring). Unless the 183 or 180 (or some other message such as an UPDATE) contained a P-Early-Media
header “authorizing” early media, he UAC is expected to generate ringback locally when it receives the 180.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">A problem has been seen in some networks, when the UAC is an older device that follows “the old rules”. Under the old rules the UAC could expect to receive ringback tone as early media, after receiving a 183
with SDP. Actually that expectation is based on a misunderstanding of the Gateway model in RFC-3960; but unfortunately a common one. The bottom line is that there are devices that will in the scenario you describe that will provide the calling user no ringback
indication.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Some networks implement interworking to resolve this. You can probably imagine how to do that. I’ll warn you, though, that there are some complicated corner cases.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Good Luck!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b>From:</b> discussion-bounces@sipforum.org [mailto:discussion-bounces@sipforum.org]
<b>On Behalf Of </b>Zuñiga, Guillermo<br>
<b>Sent:</b> Thursday, June 20, 2019 10:26 AM<br>
<b>To:</b> discussion@sipforum.org<br>
<b>Subject:</b> [E] [SIPForum-discussion] SIP Flow with a 200OK(without SDP) to the INVITE<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="ES-PA" style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">Hi fellows,</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">I would like to know the following:</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span 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.</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">Flow:</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">A ->INVITE with SDP</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:283.2pt"><span style="font-family:"Arial",sans-serif;color:#1F497D">B<-TRYING</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:283.2pt"><span style="font-family:"Arial",sans-serif;color:#1F497D">B<-183 WITH SDP</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">A->PRACK</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span style="font-family:"Arial",sans-serif;color:#1F497D">B<-200OK TO THE PRACK</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span style="font-family:"Arial",sans-serif;color:#1F497D">B<-180 RINGING WITHOUT SDP</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:247.8pt;text-indent:35.4pt"><span style="font-family:"Arial",sans-serif;color:#1F497D">B<-200OK WITHOUT SDP TO THE INVITE.</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">A->ACK TO THE 200OK WITHOUT SDP TO THE INVITE.</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span 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?</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span 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.</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">Regards,</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D">Guillermo</span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1F497D"> </span><span lang="ES-PA"><o:p></o:p></span></p>
<p class="f1fd8ef2-de04-4a74-a01f-b952c9aa1b3b"><span lang="ES-PA"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Futura",serif;color:black;text-transform:uppercase">Guillermo Zuniga</span></b><b><span style="font-size:10.0pt;font-family:"Futura",serif;color:black;text-transform:uppercase"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Futura Bk BT",serif;color:black;text-transform:uppercase">Especialista de Soporte Técnico</span></b><b><span style="font-size:10.0pt;font-family:"Futura",serif;color:black;text-transform:uppercase"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Futura Bk BT",serif;color:black;text-transform:uppercase">Gerencia de Soporte Técnico</span><b><span style="font-size:10.0pt;font-family:"Futura",serif;color:black;text-transform:uppercase"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Futura",serif">+507 263-6671</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Futura",serif">| +507 6670-0481</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Futura Bk BT",serif"><a href="mailto:Guillermo.Zuniga@cwpanama.com">Guillermo.Zuniga@cwpanama.com</a></span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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