Server being attached

Hello All
I need your help please
[Jan 14 13:03:36] NOTICE[2923]: chan_sip.c:15032 handle_request_invite: Sending fake auth rejection for user sip:1001@IP;tag=190364702

Usually I can block the IP in Iptables but this shows it coming from ip 0 0 0 0
0.0.0.0 1001 474473836-1 00101/00002 0x0 (nothing) No Rx: INVITE

What can I do to block this?
I tried adding ip 0 0 0 0 in iptables to block it but it didnt work.

By using the IP reported in the security log.

The domain part of the From header URI is not really useful for security purposes.

0.0.0.0 is not a valid IP address. It is used as an indicator of a held stream in SDP, so could not be used reliably in SIP, even if your routers allowed you to route to it.

Hi David
Thanks for reply
By using the IP reported in the security log ← which log file you are referring to?
I want to ban this, but not able to

https://wiki.asterisk.org/wiki/display/AST/Asterisk+Security+Event+Logger

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