Think this ticket is related
https://github.com/kamailio/kamailio/issues/1215

пт, 20 апр. 2018 г. в 22:12, Volkan Oransoy <voransoy@gmail.com>:
Hi all,

I have a Kamailio box which I use as a uac_client. We register a bunch of accounts to remote providers. The box relays incoming calls to a FreeSwitch box. We encountered a strange problem on one account.
Kamailio relays the call to my FreeSwitch box successfully but routes the ACK itself which is the reply of 200Ok. I believe this is a provider related issue but I need a technical explanation. Does anyone have any idea?

Here is the packet capture: https://pastebin.com/PA8StiWY

Thanks,

Screen Shot 2018-04-20 at 11.06.38.png


--
Volkan Oransoy
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