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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">just to add to the RFC quoted below: this is referring to 1xx or 2xx responses. But later on, in the section, the RFC seems to be quite clear:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New""> If the only<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New""> response that was received is a 503, the proxy SHOULD generate<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New""> a 500 response and forward that upstream.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<pre><span lang="EN-GB"> A proxy MUST NOT modify the To tag in any forwarded response to<o:p></o:p></span></pre>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New""> a request that contains a To tag.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Henning<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:35.4pt"><b><span lang="EN-GB">From:</span></b><span lang="EN-GB"> sr-users <sr-users-bounces@lists.kamailio.org>
<b>On Behalf Of </b>Gerry | Rigatta<br>
<b>Sent:</b> Thursday, July 23, 2020 2:41 PM<br>
<b>To:</b> miconda@gmail.com<br>
<b>Cc:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org><br>
<b>Subject:</b> Re: [SR-Users] bug ? remap_503_500 breaks dialogs<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt">Hi Daniel,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">thanks for looking into this.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">The initial INVITE does not have a to-tag but there is an intermediate session progress with a to-tag. See grep below.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">The RFC does not distinguish between established or provisional dialogs when it comes to the handling of the to-tags. If there is a to-tag it must not be changed by the Proxy. Clearly that must be so because the
to-tag is used by the UAC to identify the call. <o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">Best Gerry<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">IP addresses are changed in below dialog for security reasons<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 7.7.23.109:5060 -> 11.22.17.24:5060 #5<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"> INVITE <a href="sip:111100791456321475@13.23.9.94:5060">
sip:111100791456321475@13.23.9.94:5060</a> SIP/2.0..Max-Forwards: 19.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"> .P-Asserted-Identity: <a href="tel:+4867777777..Via:">
tel:+4867777777..Via:</a> SIP/2.0/UDP 7.7.23.109:5060<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ;rport;branch=z9hG4bK1682611991..From: "004867777777" <<a href="sip:004867777777@7">sip:004867777777@7</a><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 8.47.203.109>;tag=540342132..To: <<a href="sip:111100791456321475@13.23.9.94:5060">sip:111100791456321475@13.23.9.94:5060</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> >..Call-ID: <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..User-Agent: nulltech.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> .Contact: <<a href="sip:004867777777@7.7.23.109:5060">sip:004867777777@7.7.23.109:5060</a>>..Allow: ACK, INVITE, BYE, <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> CANCEL, REGISTER, REFER, OPTIONS, PRACK, INFO..Supported: 100rel..Content-T<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ype: application/sdp..Content-Length: 209....v=0..o=yate 1595505273 1595505<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 273 IN IP4 7.7.23.109..s=SIP Call..c=IN IP4 7.7.23.109..t=0 0..m=audi<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> o 28610 RTP/AVP 8 0 101..a=rtpmap:8 PCMA/8000..a=rtpmap:0 PCMU/8000..a=rtpm<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ap:101 telephone-event/8000.. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 7.7.23.109:5060 #6<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 100 trying -- your call is important to us..Via: SIP/2.0/UDP 78.47.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 203.109:5060;rport=5061;branch=z9hG4bK1682611991;received=7.7.23.109..Fr<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> om: "004867777777" <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <s<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ip:<a href="mailto:111100791456321475@13.23.9.94">111100791456321475@13.23.9.94</a>:5060>..Call-ID:
<a href="mailto:1279305029@7.7.23.10">1279305029@7.7.23.10</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 9..CSeq: 1 INVITE..Server: kamailio (5.2.3 (x86_64/linux))..Content-Length:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 13.23.9.94:5060 #7<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> INVITE <a href="sip:111100791456321475@13.23.9.94:5060">
sip:111100791456321475@13.23.9.94:5060</a> SIP/2.0..Record-Route: <si<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> p:11.22.17.24:5060;lr=on>..Max-Forwards: 18..P-Asserted-Identity:
<a href="tel:+">tel:+</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 4867777777..Via: SIP/2.0/UDP 11.22.17.24:5060;branch=z9hG4bK58d4.f1e37<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> b7feb047b6707c5fb8a298d36fc.0..Via: SIP/2.0/UDP 7.7.23.109:5060;received<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> =7.7.23.109;rport=5061;branch=z9hG4bK1682611991..From: "004867777777" <<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="sip:004867777777@7.7.23.109">
sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <<a href="sip:111100791456321475">sip:111100791456321475</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> @13.23.9.94:5060>..Call-ID: <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..Us<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> er-Agent: nulltech..Contact: <<a href="sip:004867777777@7.7.23.109:5060">sip:004867777777@7.7.23.109:5060</a>>..Allow:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ACK, INVITE, BYE, CANCEL, REGISTER, REFER, OPTIONS, PRACK, INFO..Supported<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> : 100rel..Content-Type: application/sdp..Content-Length: 209....v=0..o=yate<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 1595505273 1595505273 IN IP4 7.7.23.109..s=SIP Call..c=IN IP4 7.7.23<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> .109..t=0 0..m=audio 28610 RTP/AVP 8 0 101..a=rtpmap:8 PCMA/8000..a=rtpmap:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 0 PCMU/8000..a=rtpmap:101 telephone-event/8000.. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 13.23.9.94:5060 -> 11.22.17.24:5060 #8<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 100 Trying..Via: SIP/2.0/UDP 11.22.17.24:5060;branch=z9hG4bK58d<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 4.f1e37b7feb047b6707c5fb8a298d36fc.0;received=11.22.17.24..Via: SIP/2.0<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> /UDP 7.7.23.109:5060;received=7.7.23.109;rport=5061;branch=z9hG4bK168<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 2611991..Record-Route: <<a href="sip:11.22.17.24:5060;lr=on">sip:11.22.17.24:5060;lr=on</a>>..From: "00371673360<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 58" <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <<a href="sip:1111007914563">sip:1111007914563</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:21475@13.23.9.94">
21475@13.23.9.94</a>:5060>..Call-ID: <a href="mailto:1279305029@7.7.23.109">1279305029@7.7.23.109</a>..CSeq: 1 INVIT<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> E..User-Agent: Ravetel SIP proxy..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> REFER, SUBSCRIBE, NOTIFY, INFO..Supported: replaces..Contact: <<a href="sip:1111007">sip:1111007</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:91456321475@13.23.9.94">
91456321475@13.23.9.94</a>:5060>..Content-Length: 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 13.23.9.94:5060 -> 11.22.17.24:5060 #9<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP 11.22.17.24:5060;branch=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> z9hG4bK58d4.f1e37b7feb047b6707c5fb8a298d36fc.0;received=11.22.17.24..Vi<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> a: SIP/2.0/UDP 7.7.23.109:5060;received=7.7.23.109;rport=5061;branch=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> z9hG4bK1682611991..Record-Route: <<a href="sip:11.22.17.24:5060;lr=on">sip:11.22.17.24:5060;lr=on</a>>..From: "0<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 04867777777" <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <<a href="sip:103">sip:103</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:000791456321475@13.23.9.94">
000791456321475@13.23.9.94</a>:5060>;tag=as6d86b4e8..Call-ID: 1279305029@78.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 47.203.109..CSeq: 1 INVITE..User-Agent: Ravetel SIP proxy..Allow: INVITE, A<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> CK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO..Supported: replac<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> es..Contact: <<a href="sip:111100791456321475@13.23.9.94:5060">sip:111100791456321475@13.23.9.94:5060</a>>..Content-Type: app<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> lication/sdp..Content-Length: 235....v=0..o=root 714 714 IN IP4 136.243.29.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 94..s=session..c=IN IP4 13.23.9.94..t=0 0..m=audio 10454 RTP/AVP 8 0 101<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ..a=rtpmap:8 PCMA/8000..a=rtpmap:0 PCMU/8000..a=rtpmap:101 telephone-event/<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 8000..a=fmtp:101 0-16..a=ptime:20..a=sendrecv.. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 7.7.23.109:5060 #10<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP 7.7.23.109:5060;received=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 7.7.23.109;rport=5061;branch=z9hG4bK1682611991..Record-Route: <<a href="sip:116.2">sip:116.2</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 02.187.204:5060;lr=on>..From: "004867777777" <<a href="sip:004867777777@7.7.23">sip:004867777777@7.7.23</a>.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 109>;tag=540342132..To: <<a href="sip:111100791456321475@13.23.9.94:5060">sip:111100791456321475@13.23.9.94:5060</a>>;tag=as6<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> d86b4e8..Call-ID: <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..User-Agent: Ravet<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">el SIP proxy..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> NOTIFY, INFO..Supported: replaces..Contact: <<a href="sip:111100791456321475@136.24">sip:111100791456321475@136.24</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 3.29.94:5060>..Content-Type: application/sdp..Content-Length: 235....v=0..o<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> =root 714 714 IN IP4 13.23.9.94..s=session..c=IN IP4 13.23.9.94..t=0 <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 0..m=audio 10454 RTP/AVP 8 0 101..a=rtpmap:8 PCMA/8000..a=rtpmap:0 PCMU/800<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 0..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-16..a=ptime:20..a=sendre<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> cv.. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 13.23.9.94:5060 -> 11.22.17.24:5060 #39<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 503 Service Unavailable..Via: SIP/2.0/UDP 11.22.17.24:5060;bran<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ch=z9hG4bK58d4.f1e37b7feb047b6707c5fb8a298d36fc.0;received=11.22.17.24.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> .Via: SIP/2.0/UDP 7.7.23.109:5060;received=7.7.23.109;rport=5061;bran<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ch=z9hG4bK1682611991..From: "004867777777" <<a href="sip:004867777777@7.7.23.10">sip:004867777777@7.7.23.10</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 9>;tag=540342132..To: <<a href="sip:111100791456321475@13.23.9.94:5060">sip:111100791456321475@13.23.9.94:5060</a>>;tag=as6d8<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 6b4e8..Call-ID: <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..User-Agent: Ravet<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> el SIP proxy..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, N<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> OTIFY, INFO..Supported: replaces..X-Asterisk-HangupCause: Call Rejected..X-<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> Asterisk-HangupCauseCode: 21..Content-Length: 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 13.23.9.94:5060 #40<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> ACK <a href="sip:111100791456321475@13.23.9.94:5060">
sip:111100791456321475@13.23.9.94:5060</a> SIP/2.0..Max-Forwards: 18..Vi<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> a: SIP/2.0/UDP 11.22.17.24:5060;branch=z9hG4bK58d4.f1e37b7feb047b6707c5<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> fb8a298d36fc.0..From: "004867777777" <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> =540342132..To: <<a href="sip:111100791456321475@13.23.9.94:5060">sip:111100791456321475@13.23.9.94:5060</a>>;tag=as6d86b4e8.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> .Call-ID: <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 ACK..Content-Length: 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 7.7.23.109:5060 #41<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 500 Service Unavailable..Via: SIP/2.0/UDP 7.7.23.109:5060;rport=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 5061;branch=z9hG4bK1682611991;received=7.7.23.109..From: "004867777777"<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <<a href="sip:1111007914563214">sip:1111007914563214</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:75@13.23.9.94">
75@13.23.9.94</a>:5060>;tag=95329101123423eab1637e9ad490b3a6-9d3c..Call-ID: <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..Server: kamailio (5.2.3 (x86_64/l<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> inux))..Content-Length: 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">U 11.22.17.24:5060 -> 7.7.23.109:5060 #42<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> SIP/2.0 500 Service Unavailable..Via: SIP/2.0/UDP 7.7.23.109:5060;rport=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> 5061;branch=z9hG4bK1682611991;received=7.7.23.109..From: "004867777777"<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <<a href="sip:004867777777@7.7.23.109">sip:004867777777@7.7.23.109</a>>;tag=540342132..To: <<a href="sip:1111007914563214">sip:1111007914563214</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:75@13.23.9.94">
75@13.23.9.94</a>:5060>;tag=95329101123423eab1637e9ad490b3a6-9d3c..Call-ID: <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <a href="mailto:1279305029@7.7.23.109">
1279305029@7.7.23.109</a>..CSeq: 1 INVITE..Server: kamailio (5.2.3 (x86_64/l<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> inux))..Content-Length: 0.... <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">#<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On 23 Jul 2020, at 10:51, Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>> wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Did the initial INVITE received the 200ok, the call is connected and this is the case of a re-INVITE? In such case the dialog has to be terminated by a BYE.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
If the call is not established, so it is between initial INVITE and no 200ok was received, then the INVITE request did not contain the To-tag. And what is done by Kamailio is valid as per email responses so far.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Maybe you can just send the ngrep output with all sip requests/replies for this case and we can see exactly which scenario you talk about.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Cheers,<br>
Daniel<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On 23.07.20 09:41, Gerry | Rigatta wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Indeed, at this stage there is no dialog established and there can be many To-tags in 1xx provisional responses (eg, a parallel forking scenario) -- the to-tag of the dialog has to be taken from 200ok.<o:p></o:p></p>
</div>
</blockquote>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">As far as I read this is not correct. Also a provisional dialog is a dialog according to RFC3261. Only in the case that the request did not contain a to-tag the provisional messages may insert their own to-tags:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<pre style="margin-left:35.4pt">"1xx and 2xx responses may be involved in the establishment of<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> dialogs. When a request does not contain a To tag, the To tag<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> in the response is used by the UAC to distinguish multiple<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> responses to a dialog creating request. A proxy MUST NOT<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> insert a tag into the To header field of a 1xx or 2xx response<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> if the request did not contain one. A proxy MUST NOT modify<o:p></o:p></pre>
<pre style="margin-left:35.4pt"> the tag in the To header field of a 1xx or 2xx response.”<o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="https://tools.ietf.org/html/rfc3261#page-111">https://tools.ietf.org/html/rfc3261#page-111</a><o:p></o:p></pre>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">In any case, this bug is not a about provisional messages. The 500 message terminates the dialog for the UAC (yate) and the UAC needs to be able to identify it. An UAC identifies the dialog by the call-id, local
tag and remote tag.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<div>
<h2 style="margin-left:70.8pt"><a href="https://tools.ietf.org/html/rfc3261#section-12" target="_blank"><span style="font-family:"Arial",sans-serif">12</span></a><span style="font-family:"Arial",sans-serif"> Dialogs</span><o:p></o:p></h2>
<h2 style="margin-left:70.8pt"><span style="font-family:"Arial",sans-serif">A dialog is identified at each UA with a dialog ID, which consists of a Call-ID value, a local tag and a remote tag…"</span><o:p></o:p></h2>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On 23 Jul 2020, at 10:07, Daniel-Constantin Mierla <<a href="mailto:miconda@gmail.com">miconda@gmail.com</a>> wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Indeed, at this stage there is no dialog established and there can be many To-tags in 1xx provisional responses (eg, a parallel forking scenario) -- the to-tag of the dialog has to be taken from 200ok.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
This parameter is probably to have a shortcut of doing:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
failure_route[REMAP503] {<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
if(t_check_status("503")) {<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
t_reply("500", "Server error");<br>
exit;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
}<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Being like the server application is generating the 500 (so using own tag), instead of forwarding the 503. Not a bug, but if anyone is willing to add an option to allow re-using the to-tag from received reply, I am fine with it.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Anyhow, even if this would be fixed, I am wondering how yate is going to work in parallel/serial forking scenarios where different to-tags flow for a while and the final failure response can have any to-tag, including a new one (e.g., from a device not sending
any 1xx or again from kamailio (e.g., when last target doesn't reply at all)).<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Cheers,<br>
Daniel<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On 23.07.20 06:08, M S wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">The SIP code 503 is tricky in the sense that i can indicate either server maintenance or server overload. In both cases it can send Retry-After header and any subsequent requests from same source are ignored for
the duration of Retry-After interval. [1].<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Additionally RFC3261 and RFC3263 define that transport failures (generally due to fatal ICMP errors in UDP and connection failures in TCP) should be treated as 503 response. [2].<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">So in all above cases, it is most likely that dialog does not establishes at all and 503 response is treated similar to stateless response. Therefore, a to-tag can be added/replaced before sending it to UAC.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Theoretically, kamailio should check and use to-tag from 503 response when converting it to 500 response and only create new to-tag if it is absent.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">References:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">[1] <a href="https://tools.ietf.org/html/rfc3261#section-21.5.4">
https://tools.ietf.org/html/rfc3261#section-21.5.4</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">[2] <a href="https://tools.ietf.org/html/draft-hilt-sip-correction-503-01#section-4">
https://tools.ietf.org/html/draft-hilt-sip-correction-503-01#section-4</a><o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">Hope this helps.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="margin-left:35.4pt">On Wed, 22 Jul 2020 at 21:08, Henning Westerholt <<a href="mailto:hw@skalatan.de">hw@skalatan.de</a>> wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
Hello,<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
<span lang="EN-GB">Apparently, this is the way the code works:</span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-GB"> </span><o:p></o:p></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:35.4pt">
<span lang="EN-GB">t_reply.c:</span><o:p></o:p></p>
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<span lang="EN-GB"> if (relayed_code==503 && tm_remap_503_500){</span><o:p></o:p></p>
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<span lang="EN-GB"> /* replace a final 503 with a 500:</span><o:p></o:p></p>
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<span lang="EN-GB"> * generate a "FAKE" reply and a new to_tag (for easier</span><o:p></o:p></p>
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<span lang="EN-GB"> * debugging)*/</span><o:p></o:p></p>
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<span lang="EN-GB">Lets see if maybe others can comment as well. Otherwise you could just open an issue on our tracker, it is probably not that hard to change this.</span><o:p></o:p></p>
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<span lang="EN-GB">Cheers,</span><o:p></o:p></p>
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<span lang="EN-GB">Henning</span><o:p></o:p></p>
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<span lang="EN-GB">-- </span><o:p></o:p></p>
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<span lang="EN-GB">Henning Westerholt – </span><a href="https://skalatan.de/blog/" target="_blank"><span lang="EN-GB" style="color:#0563C1">https://skalatan.de/blog/</span></a><o:p></o:p></p>
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<span lang="EN-GB">Kamailio services – </span><a href="https://gilawa.com/" target="_blank"><span lang="EN-GB" style="color:#0563C1">https://gilawa.com</span></a>
<o:p></o:p></p>
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<b>From:</b> sr-users <<a href="mailto:sr-users-bounces@lists.kamailio.org" target="_blank">sr-users-bounces@lists.kamailio.org</a>>
<b>On Behalf Of </b>Gerry | Rigatta<br>
<b>Sent:</b> Wednesday, July 22, 2020 8:58 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <<a href="mailto:sr-users@lists.kamailio.org" target="_blank">sr-users@lists.kamailio.org</a>><br>
<b>Subject:</b> [SR-Users] bug ? remap_503_500 breaks dialogs<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:70.8pt">
Hi,<o:p></o:p></p>
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I am using Kamailio 5.2. <o:p></o:p></p>
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Apparently the remapping of 503 to 500 codes in the tm module does also change the to-tag. This behaviour breaks dialogs with yate and therefore calls hang and the 503 remains unacknowledged. After disabling the 503 to 500 remapping with modparam("tm", "remap_503_500",
0) all works fine again.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
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Changing the to-tag in a dialog seems to contradict RFC3261, or do I see this wrongly?<o:p></o:p></p>
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<h2 style="margin-left:70.8pt"><a name="m_-5300728039720019352_section-12"></a><a href="https://tools.ietf.org/html/rfc3261#section-12" target="_blank"><span style="font-family:"Arial",sans-serif">12</span></a><span style="font-family:"Arial",sans-serif"> Dialogs</span><o:p></o:p></h2>
<h2 style="margin-left:70.8pt"><span style="font-family:"Arial",sans-serif">A dialog is identified at each UA with a dialog ID, which consists of a Call-ID value, a local tag and a remote tag…"</span><o:p></o:p></h2>
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<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
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Thanks for looking into this.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt"> <o:p></o:p></p>
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Gerry<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:35.4pt">_______________________________________________<br>
Kamailio (SER) - Users Mailing List<br>
<a href="mailto:sr-users@lists.kamailio.org" target="_blank">sr-users@lists.kamailio.org</a><br>
<a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users" target="_blank">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></p>
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<o:p></o:p></p>
<pre style="margin-left:35.4pt">_______________________________________________<o:p></o:p></pre>
<pre style="margin-left:35.4pt">Kamailio (SER) - Users Mailing List<o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></pre>
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<pre style="margin-left:35.4pt">-- <o:p></o:p></pre>
<pre style="margin-left:35.4pt">Daniel-Constantin Mierla -- <a href="http://www.asipto.com/">www.asipto.com</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt">Funding: <a href="https://www.paypal.me/dcmierla">https://www.paypal.me/dcmierla</a><o:p></o:p></pre>
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<p class="MsoNormal" style="margin-left:35.4pt">_______________________________________________<br>
Kamailio (SER) - Users Mailing List<br>
<a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a><br>
<a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></p>
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<pre style="margin-left:35.4pt">-- <o:p></o:p></pre>
<pre style="margin-left:35.4pt">Daniel-Constantin Mierla -- <a href="http://www.asipto.com/">www.asipto.com</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt"><a href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a><o:p></o:p></pre>
<pre style="margin-left:35.4pt">Funding: <a href="https://www.paypal.me/dcmierla">https://www.paypal.me/dcmierla</a><o:p></o:p></pre>
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