you can start by simply telling us what is the purpose of your server.. and
does it have long distance of overseas?? do you use Numeric usernames? simple
passwords? passwords the same as your username? this way you can offer more
info so we can help you.a quick answer will be.. opening a few and blocking ALL
is easier.. as you can have upto 400 prefix to block .. unless you call world
wide.. then you will have to block the countries you don't call .. another
option.. make your usernames more complex.. letters and numbers.. an additional
option is to use fail2ban with Asterisk support.. it will block the IP after
the number of attempts you set in the configs. a client of mine wanted simple
usernames and passwords to be setup using the keypad on the ipphones.. two
months ago they had the same problem you faced.. 400$ to Zimbabway .. and later
on 1200$ to Zimbabway.. their provider have a limit of 30 minutes per call ..
so the caller had to redial.. unless it's automated.still you can provide us
with more info.Regards
-- Tarek Sawah
Integrated Digital Systems
CCNA, MCSE, RHCE, VoIP USA: +1 386 492 9993
> Date: Wed, 23 Jun 2010 16:08:51 +0000
> From: [email protected]
> To: [email protected]
> Subject: [asterisk-users] one for your filters
>
>
> Some !...@$#@@# in the Czech Republic used one of our SIP accounts to place
> four thousand calls to what appears to be a toll number in Zimbabwe last
> night. Filter 82.150.165.5.
>
> A more overriding problem for me is how do we know what *destinations* to
> filter so this idea of war dialing a toll number is something we can
> cutoff before it gets to our upstream provider? Is there some collected
> list of toll prefixes that I can filter on?
>
> Cheers,
>
> j
>
> --
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