<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
We dealt with this years ago. <br>
<br>
The solution was 2 fold: <br>
<br>
1: Stop using port 5060. Pick some other port for your phones to
listen on locally. Do the same thing on your access-edge SBC's (this
will also pay dividends in ALG avoidance). <br>
2: Find the CPE option to restrict inbound to only the registered
proxy. As mentioned before this might be different for each device
make but it is unquestionably the best solution. <br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/20/2015 12:14 PM, Carlos Alvarez
wrote:<br>
</div>
<blockquote
cite="mid:CAEu0Vi2p_eWYj2ou6Oq8ejppDpjb045FPwfjA4EzYWiEahyYJA@mail.gmail.com"
type="cite">
<div dir="ltr">We're starting to see customers who get random
arbitrary ringing caused by a random connection attempt from the
internet. Most of our customers have Cisco routers with
full-cone NAT, so it's easy to do that. We don't reinvite
handsets, we proxy the media, so we've considered using
restricted NAT instead. If we can figure out how, we can't find
any documentation on how to do it, and don't have a response to
our Cisco TAC case on it yet.
<div><br>
</div>
<div>But I figured I'd ask if others have come up with better
solutions. I know there are a few authentication options in
the phones themselves, but they seem to vary greatly by vendor
and even by model. I like to do things as simply and
system-wide as possible. We primarily sell Grandstream, and
we support Cisco/Linksys SPA as well as Polycom IP series (not
VVX).</div>
<div><br>
</div>
<div>We're an Asterisk-based hosted service provider.</div>
<div><br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
VoiceOps mailing list
<a class="moz-txt-link-abbreviated" href="mailto:VoiceOps@voiceops.org">VoiceOps@voiceops.org</a>
<a class="moz-txt-link-freetext" href="https://puck.nether.net/mailman/listinfo/voiceops">https://puck.nether.net/mailman/listinfo/voiceops</a>
</pre>
</blockquote>
<br>
</body>
</html>