I've just start a preliminary work on this issue, and i start working on this use case:
call forwarding to external number, so A, B and C where C is not local extension, reachable through an unmanaged gateway (so without sbc) what i see is that: A call B, B sends 302 to A but this message is handled by the proxy that creates a new invite for C C reply to invite with 183 and then with 200 ok but none of this messages are forwarded to A as consequence in the cdr we have just a not connected call. here I attach the related pcap to this scenario just to be sure the the source isn't into some wrong config
fwd_call.pcap
Description: application/vnd.tcpdump.pcap
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