I just ran some tests and it does look like the CSeq is being sent with a different value
between the two. I see `CSeq: 2 INVITE` going to homer and `CSeq: 4 INVITE` going to
FreeSwitch for the same message.
If you like the solution I proposed above (the msg_send_metadata() one) and can't
think of any issues it would cause I can get that implemented with a PR.
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