<div dir="ltr">That's the default for all the handsets, I believe. There are various options such as "accept only from proxy" or "only from registrar," but like I said it varies so it could be more challenging to employ that. Also in our limited testing it seems like it may not have had the intended effect. Possibly because NAT hides the original IP, but I don't know that for sure.<div><br></div><div>Most phones also have an option to force auth for incoming invites, which we have not tested yet.</div><div><br><div><div><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 20, 2015 at 1:21 PM, Alex Balashov <span dir="ltr"><<a href="mailto:abalashov@evaristesys.com" target="_blank">abalashov@evaristesys.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">That said, it is baffling to me that phones accept INVITEs unchallenged from anywhere but $REGISTRAR_IP/$OUTBOUND_PROXY_IP.<div class="HOEnZb"><div class="h5"><br>
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