[Freeswitch-users] Hangup calls RC=200 without RC=183

Hi. I was trying to get a solution for this but I can't find any online. When FreeSWITCH received an incoming call it send the call trought a provider, but my provider sometimes send OK(200) without 183(Session Progress) and the call is answered. I need from FreeSWITCH to detect this behaviour and send 503 instead of sending OK(200) to the incoming call. This possible? Thank you all for any recommendations Abel.