One of scenarios is with ACK and OPTIONS without any Route headers, so not with two
headers.
You also have to take the pcap on kamailio, to see what kamailio adds as record route
headers and the sip traffic on both sides with caller and callee.
With a quick check here, all is working fine with one Route header having two addresses.
Verify your scenarios and if you get the sip traffic with proper headers and the issue is
still there, reopen and add pcaps taken on kamailio with the sip traffic in both sides.
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