Most likely it's a bogus script.
Sometimes just sending a dummy reply, will stop the script sending SIP requests.
Check the User-Agent header and from username to see if you can
identify the script and google around for it.

Regards,
Ovidiu Sas

On Tue, Nov 26, 2013 at 4:17 PM, Joli Martinez <mrjoli...@gmail.com> wrote:
> I am running Kamailio in CentOS.  I ran tcpdump and noticed that we are 
> getting attacked from IP 188.138.32.72.  I have already blocked it on 
> IPtables, but he keeps on attacking the server.  If I look at 
> "/var/log/secure" there are no SIP messages.  My question is where is the log 
> file for Kamailio and how can I prevent this type of attacks in the future.
>
> Thanks,
> _______________________________________________
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> sr-users@lists.sip-router.org
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