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<body class='hmmessage'><div dir='ltr'>Hi,<div><br></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Does kamailio support PRACK method ? Any configuration change is needed?</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">It appears Kamailio does not like the PRAK when increasing Cseq. </span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Here is the call flow:</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">A send INVITE --> Kamailio --> proxy the packet to B</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">B send </span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">180 Ringing --> </span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Kamailio </span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">-> proxy the packet to A</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">A send PRAK (increase Cseq) --> Kamailio --> proxy the packet to B</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><span class="Apple-style-span" style="font-family: Calibri, sans-serif; font-size: 16px; border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; "><div style="text-indent: 0px !important; "><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">B send 200 OK</span><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "> --> </span><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Kamailio </span><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">-> proxy the packet to A</span></div></span></span><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Kamailio re-send 180 Ringing</span><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "> to A</span><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><span class="Apple-style-span" style="font-family: Calibri, sans-serif; font-size: 16px; border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; "><div><span class="Apple-style-span" style="text-indent: 0px !important; border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></div></span></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><br></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">Thanks,</span></div><div><span class="Apple-style-span" style="border-collapse: collapse; font-family: Verdana, Geneva, Helvetica, Arial, sans-serif; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">AS</span></div><div><font class="Apple-style-span" face="Verdana, Geneva, Helvetica, Arial, sans-serif" size="2"><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px;"><br></span></font></div> </div></body>
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