[Freeswitch-users] SBC

[Kamil Nigmatullin]

I understand that. But CDR comes after the call is done. Sometimes one
minute costs 10$ and I understand this after 20 minutes. I agree that this
things doest't guarantee anything but it is funcionality of so called SBC.
And it helps almost in any case except attackers broke sip device and sends
traffic from this devices where monitoring and various limitations are
really important. And about REFFER attack it is really very dangerous thing
that is not fixes yet.

2016-12-12 10:00 GMT+06:00 Ken Rice <krice at freeswitch.org>:

> 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
>
> Sent from my iPhone
>
> On Dec 11, 2016, at 21:43, Kamil Nigmatullin <kamil.nigmatullin at gmail.com>
> wrote:
>
> 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.
>
> 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.
>
> 2016-12-12 8:56 GMT+06:00 Alex Balashov <abalashov at evaristesys.com>:
>
>> On Mon, Dec 12, 2016 at 08:17:57AM +0600, Kamil Nigmatullin wrote:
>>
>> > I love freeswitch, but frankly I would not recomend to set it as SBC. I
>> > personally faced two attacks where FS was not good at. And we lost a
>> lot of
>> > money. It works perfectly as NAT between internal and extenal networks,
>> > actually in everything but it is weak as a firewall. Stanislav knows
>> that,
>> > he helped me to resolve the problem first time when it happend. I
>> cannot go
>> > into details as this is open forum. You need to put either kamailio or
>> > opensips in front of FS.
>>
>> Strongly agree.
>>
>> --
>> Alex Balashov | Principal | Evariste Systems LLC
>>
>> Tel: +1-706-510-6800 (direct) / +1-800-250-5920 (toll-free)
>> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>>
>> _________________________________________________________________________
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>
>
>
> --
> Kamil Nigmatullin
> Tel: 77272323748
> mob: 7 (707) 2517003 <(707)%20251-7003>
> Skype: kamil.nigmatullin
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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-- 
Kamil Nigmatullin
Tel: 77272323748
mob: 7 (707) 2517003
Skype: kamil.nigmatullin
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