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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:blue">Answering to myself: the I-CSCF routing logic contains a “append_branch()” on reception of the HSS LIR answer which is the cause of this use
less fork<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:blue">Removed it and everything is fine<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:blue"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:blue">Olivier
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> sr-users-bounces@lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
<b>De la part de</b> DURECU, OLIVIER (OLIVIER)<br>
<b>Envoyé :</b> vendredi 21 mars 2014 17:39<br>
<b>À :</b> sr-users@lists.sip-router.org<br>
<b>Objet :</b> [SR-Users] Kamailio ICSCF strange forking<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Hi all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">I have deployed an IMS based on Kamailio 4.1.2 and I don’t manage establishing a call.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Users registration is OK but when I initiate the call from
<a href="mailto:A@ims.net">A@ims.net</a> to <a href="mailto:B@ims.net">B@ims.net</a>, I notice a strange I-CSCF behavior<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">The INVITE message goes OK from P-CSCF to S-CSCF then to I-CSCF. Till this point everything is fine…<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Then the I-CSCF performs its LIR diameter request and gets an Ok response from the HSS with a S-CSCF URI<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">The I-CSCF forwards the INVITE at the received S-CSCF.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">BUT at the same time the I-CSCF generates a DNS request to resolve ims.net SIP SRV (it gets itself as answer…) and forwards a second INVITE (exact copy from the one
sent to the S-CSCF) to itself<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">So I have 2 copies of the same INVITE dialog travelling in the network and messing everything.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Any idea of the cause of this behavior .<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Thanks for your support…<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif"">Olivier
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span style="font-size:10.0pt;font-family:"Trebuchet MS","sans-serif""><o:p></o:p></span></p>
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