[Freeswitch-users] Blocking incoming calls

[Andrew Cassidy]

Set up firewall rules only allowing traffic from your providers' IP address.

On 13 March 2013 09:08, Clive Lansink <clive at lansink.co.nz> wrote:

> Hello. I hope someone can quickly see what I want to do and steer me in
> the right direction.
>
> I've looked at the documentation for acl.conf.xml and the SIP profile
> config file external.xml. I want to block incoming calls from all but a
> single external IP address and I'm sorry I just can't figure out how to do
> it or even if it can be done.
>
> We have a SIP trunk service with our VOIP provider. That means we have a
> static IP address which they use when they forward calls to us. They don't
> need to register, we just accept their calls but of course they have to be
> to our destination phone number. That all works and we have been very happy
> with Freeswitch for I don't know well over a year.
>
> Recently I became aware that someone is hammering our system trying to
> make calls. Our provider will only use port 5060 so that does mean our
> system is sitting on the internet with port 5060 open. Our dial plan works
> correctly and I can see in the log these calls are going nowhere. But they
> can be every few seconds and I suspect they might be using a lot of
> bandwidth just hammering the system.
>
> We will never receive calls from any other address than the one our VOIP
> provider will use to call us. So I just want to block SIP traffic from all
> addresses except theirs. I just want Freeswitch to stay silent when a call
> comes in on any other address, so there is no evidence that it is there to
> be attacked.
>
> I know I can do this with a firewall but I hope I can do it in Freeswitch
> itself. I am confused about the parameters auth-calls and auth-call and how
> to apply an access list that would restrict all calls to just one IP
> address. I did read somewhere in the docs that if you want to block calls
> you need to use a firewall and maybe that's the answer and so be it. Still
> I hope I can do it with Freeswitch so I can just apply the right ACL and
> sort the problem without creating new problems by introducing a firewall.
>
> Hope you can help.
>
>
> Clive Lansink
> Email: Clive at Lansink.Co.NZ
> Phone: +64 9 520-4242
> Mobile: +64 21 663-999
> Fax: +64 21 789-150
>
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-- 
*Andrew Cassidy BSc (Hons) MBCS SSCA*
Managing Director


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