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<body><p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">On Tuesday, August 25, 2026 12:51:51 a.m. Pacific Daylight Time Adrian Georgescu wrote:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> Do you have the call id?</p>
<br /><p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;"><span style="background-color:#ffffff;"><span style="font-family:monospace;"><span style="color:#000000;"><strong>Call-ID: 84babaaa-f198-4b53-989d-98d2829946c7</strong></span></span></span><br /></p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">Is signaling recorded?</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > On Aug 24, 2026, at 22:46, Robert Dyck <rob.dyck@telus.net> wrote:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Using latest flatpak for Linux.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Caller on sip2sip.info calls subscriber at a different domain. Callee</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > answers and dialog is established. So far all good.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Caller does a re-invite ( hold ). The callee's UA sends 20OK. Caller's UA</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > sends ACK. ACK never arrives. Callee's UA continues sending 200OK.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Callee is registered as GRUU. Incoming requests are normally translated by</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > the local registrar and the request is forwarded to the callee's IP</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > address. This also applies to re-INVITE and its ACK. The caller learns</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > the registrar's address from the Contact it previously received in the</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > initial 200OK.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Summary of in-dialog requests</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Initiial ACK - OK</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > re-InVITE - OK</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > second ACK - doesn't arrive</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Bye - doesn't arrive</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > An important detail - Registrar/Proxy is behind NAT. Router use DMZ</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > forwarding.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > The request URI of the ACK following re-INVITE is pointing at the external</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > address of the registrar but the ACK was received at a private address.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > The ACK is forwarded to the external address. It never reaches the</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > registrar because the router cannot hairpin the forwarded message.</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > ACK</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > sip:8@external-address:5060;gr=urn:uuid:38ee02db-f267-4dd9-9077-1b9d4fcfb</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > f00 SIP/2.0> </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Record-Route:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > <sip:212.95.45</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > .179;lr;ftag=80</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 3fbe29-6196-4af</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 7-9771-db7d2500</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 7e6c></p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Record-Route:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > <sip:174.142.2</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 05.46;r2=on;lr;</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > ftag=803fbe29-6</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 196-4af7-9771-d</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > b7d25007e6c></p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Record-Route:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > <sip:174.142.2</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 05.46;transport</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > =tcp;r2=on;lr;f</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > tag=803fbe29-61</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 96-4af7-9771-db</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 7d25007e6c></p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Via:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > SIP/2.0/UDP</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 212.95.45.179:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 5060;branch=z9h</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > G4bK45c1.804d44</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > d2.2</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Via:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > SIP/2.0/UDP</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 174.142.205.46</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > :5060;branch=z9</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > hG4bK45c1.ab795</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > fa4.2;i=d0969e0</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 7 Via:</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > SIP/2.0/TCP</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 192.168.1.3:58</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 491;received=ex</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > ternal-address;</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > rport=58491;bra</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > nch=z9hG4bKPj62</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > eb9faf-6eba-4f9</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > 1-9539-8b2954ca</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > d94a;a> </p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > lias</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > _______________________________________________</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Blink mailing list</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > Blink@lists.ag-projects.com</p>
<p style="margin-top:0;margin-bottom:0;margin-left:0;margin-right:0;">> > https://lists.ag-projects.com/mailman/listinfo/blink</p>
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