<div dir="auto">No, at sip level does not make sense.<div dir="auto"><br></div><div dir="auto">You can implement whitelists, blacklists, call screening ("dial 123 on keypad if you are a human"), etc...</div><div dir="auto"><br></div><div dir="auto">That is application logic.</div><div dir="auto"><br></div><div dir="auto">I would avoid messing with protocol on a such simple heuristics.</div><div dir="auto"><br></div><div dir="auto">But, obviously, free to do it.</div><div dir="auto"><br></div><div dir="auto">-giovanni</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><br><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Sun, Dec 8, 2019, 19:08 Abel Monzon <<a href="mailto:abelcubano@gmail.com">abelcubano@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>FAS is something that in Telecom nobody want, and I detect that if I don't receive 

ringing (18*) from the provider, them will be a call with FAS and I would like to avoid this for my incoming calls. Make sense?</div><div><br></div><div><br></div>Thank You<br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">El sáb., 7 dic. 2019 a las 18:05, Giovanni Maruzzelli (<<a href="mailto:gmaruzz@gmail.com" target="_blank" rel="noreferrer">gmaruzz@gmail.com</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Why?<div dir="auto">Provider just answer (200) instead of ringing (18*), why answer with an error (503)?</div><div dir="auto"><br></div><div dir="auto">Breaks sip logic...</div><div dir="auto"><br></div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Dec 7, 2019, 23:30 Abel Monzon <<a href="mailto:abelcubano@gmail.com" target="_blank" rel="noreferrer">abelcubano@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi.<div><br></div><div><br></div><div>I was trying to get a solution for this but I can't find any online.</div><div><br></div><div><br></div><div>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.</div><div><br></div><div>I need from FreeSWITCH to detect this behaviour and send 503 instead of sending OK(200) to the incoming call.</div><div><br></div><div><br></div><div>This possible?</div><div><br></div><div>Thank you all for any recommendations</div><div><br></div><div>Abel.</div></div>
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