[Freeswitch-users] Is there a way for FS not to send back any response to INVITE

[Oleg Stolyar]

Got it, thanks Michael!

On Wed, Jun 1, 2016 at 1:11 PM, Michael Jerris <mike at jerris.com> wrote:

> If you want to do this, put a proxy out in front... Doing it in freeswitch
> would require a complete rewrite of the sip module.
>
> On Jun 1, 2016, at 4:05 PM, Oleg Stolyar <olegstolyar at gmail.com> wrote:
>
> Thanks guys!  IP tables is how we block most traffic but we can only block
> traffic by port.  In this case it's about invalid INVITES coming in on a
> valid port.
>
> Do you think this functionality would be useful?
> Is it worth opening a feature request and perhaps putting a bounty on it?
> Any idea of the effort?
>
> On Wed, Jun 1, 2016 at 1:00 PM, Michael Jerris <mike at jerris.com> wrote:
>
>> The only way with our current sip module to accomplish either of these
>> would be to put a sip proxy out front to handle that behavior, or to
>> somehow use iptables to block the traffic
>>
>> On Jun 1, 2016, at 3:40 PM, Oleg Stolyar <olegstolyar at gmail.com> wrote:
>>
>> Hi,
>>
>> In order to protect against scanning attacks I'd like for FS to not
>> respond to INVITES unless they match certain conditions.
>>
>> I understand that currently FS always responds with 100 Trying right away
>> before processing the call and then, if the call does not match anything in
>> the dialplan, responds with a 302 Moved Temporarily.
>>
>> The 302 can be replaced with another response code (for example 403
>> Forbidden which is what I am doing now) using the *respond* dialplan
>> app.   However, that might encourage the scanner to keep trying.
>>
>> So I guess there are two questions:
>>
>> 1. Is there a way not to send back 100 Trying at all?
>>
>> 2. Is there a way to not send any final response?
>>
>>
>>
>
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