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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I have an IMS core deployed using kamailio 5.0.2. Calls from clients are reaching the core pcscf from a freeswitch (with address A.A.A.A) + a kamailio acting as proxy (with address B.B.B.B), so the INVITE request looks
like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">INVITE sip:1111111111@mnc001.mcc001.3gppnetwork.org SIP/2.0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Record-Route: <sip:A.A.A.A;lr><o:p></o:p></span></p>
<p class="MsoNormal">Via: SIP/2.0/UDP A.A.A.A;branch=z9hG4bK8735.ef7a61e110f335b2e92a8c1d430de585.0<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP B.B.B.B:5080;received=B.B.B.B;rport=5080;branch=z9hG4bKHpB704ZaXSKtm<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Max-Forwards: 65<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">From: "222222222" <sip:222222222@B.B.B.B>;tag=eytD49ymQr71S<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To: <sip:1111111111@mnc001.mcc001.3gppnetwork.org><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Call-ID: 77d249c0-487c-1236-1997-00163edbaa97<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">CSeq: 115249948 INVITE<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Contact: <sip:mod_sofia@B.B.B.B:5080><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">User-Agent: FreeSWITCH-mod_sofia/1.6.19+git~20170927T175834Z~38f568d343~64bit<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Supported: timer, path, replaces<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Allow-Events: talk, hold, conference, refer<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Content-Type: application/sdp<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Content-Disposition: session<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Content-Length: 224<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">P-Charge-Info: <sip:222222222@mobile.tuenti.int>;npi=ISDN;noa=4<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">X-FS-Support: update_display,send_info<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Remote-Party-ID: "222222222" <sip:222222222@B.B.B.B>;party=calling;screen=yes;privacy=off<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">If the client cancels the request, the CANCEL request that gets to the core pcscf looks like this:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal">CANCEL sip:1111111111@mnc001.mcc001.3gppnetwork.org SIP/2.0<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP A.A.A.A;branch=z9hG4bK8735.ef7a61e110f335b2e92a8c1d430de585.0<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Max-Forwards: 65<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">From: "222222222" <sip:222222222@B.B.B.B>;tag=eytD49ymQr71S<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To: <sip:1111111111@mnc001.mcc001.3gppnetwork.org><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Call-ID: 77d249c0-487c-1236-1997-00163edbaa97<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">CSeq: 115249948 CANCEL<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Content-Length: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Reason: Q.850;cause=16;text="Normal Call Clearing"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The processing of the CANCEL at the pcscf is eventually reaching the t_check_trans() function, but the logs return “no CANCEL matching found!” and thus the processing ends. I have followed the code up to the via_matching
function in the t_lookup.c file of the tm module source and added some logs. The via matching is failing at the port comparison (the port stored for the INVITE is “5060”, the port stored for the CANCEL is “0”.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The flow works ok with a different client (connected directly to the core) which includes the port in the Via headers.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">¿Can this be a bug in kamailio or am I doing something wrong?. AFAIK The RFC 3261 does not mandate to include the ports in the sent-by element of the Via header<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Carlos<o:p></o:p></span></p>
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