<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>You do realize all of these things can be chexked in freeswitch. However no amount of checking various things the user is sending will stop such fraud. This is where your cdr's and pattern analysis come into play. Theres a reason large providers have rooms full of fraud prevention people<br><br>Sent from my iPhone</div><div><br>On Dec 11, 2016, at 21:43, Kamil Nigmatullin <<a href="mailto:kamil.nigmatullin@gmail.com">kamil.nigmatullin@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">The first was the problem, where attacker somehow got login and password (i think they broke thier ATA) from clinet and used it. But for this client there was a limit of one line. I used limit module with local database. What attacker actially did, is that they used REFER attack, where they put their own number as a referrer, and opened unlimited lines to PSTN. So the, solution was - to replace limit functunality to opensips. <div><br></div><div>The second - it is not actually the FS issue. It is because Freeswitch is not flexible enouph to work at the low level where Kamailio or opensips operates. E.g, we programmed opensips to lookup for UserAgent database, we add useragent for each client manually. And only using client's IP and user-agent we allow this user to call to PSTN. We watch for blacklists of IP adresses, subnets. If it comes from Gaza, Panama, China we block it. And a lot of other things. Most of them is not out-of-box in opensips, but it is not hard to implement. All this functionality is very important. We lost about $10k last time. This is very serious.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-12-12 8:56 GMT+06:00 Alex Balashov <span dir="ltr"><<a href="mailto:abalashov@evaristesys.com" target="_blank">abalashov@evaristesys.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Mon, Dec 12, 2016 at 08:17:57AM +0600, Kamil Nigmatullin wrote:<br>
<br>
> I love freeswitch, but frankly I would not recomend to set it as SBC. I<br>
> personally faced two attacks where FS was not good at. And we lost a lot of<br>
> money. It works perfectly as NAT between internal and extenal networks,<br>
> actually in everything but it is weak as a firewall. Stanislav knows that,<br>
> he helped me to resolve the problem first time when it happend. I cannot go<br>
> into details as this is open forum. You need to put either kamailio or<br>
> opensips in front of FS.<br>
<br>
</span>Strongly agree.<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Kamil Nigmatullin<br>Tel: 77272323748<br>mob: 7 (707) 2517003<br>Skype: kamil.nigmatullin</div></div>
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