<div dir="ltr">We've found 404 to be extremely reliable when received from upstream carriers. It's one of the very few codes that we don't route advance on because we found that calls never compete if someone hands back a 404.<div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p dir="ltr" style="line-height:1;margin-top:0pt;margin-bottom:0pt"><span style="line-height:normal">JM</span><br></p><p dir="ltr" style="line-height:1;margin-top:0pt;margin-bottom:0pt"><span style="line-height:normal"><br></span></p><p dir="ltr" style="line-height:1;margin-top:0pt;margin-bottom:0pt"><span style="line-height:normal"><br></span></p></div></div></div></div></div></div><div class="gmail_quote">On Tue, Oct 20, 2015 at 10:48 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">Thanks. And I'm guessing the best one can hope for from a SIP termination provider is an ambiguous 404, or, more likely, a 503, which seems to have become misused an opaque, catch-all epithet for any and all completion failures?<br>
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Alex Balashov | Principal | Evariste Systems LLC<br>
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