[asterisk-users] Asterisk secure fine tune - stop attack

[motty cruz]

Hi All,
I see this kind of attack on our Asterisk Server, do you know how to block
that IP?

[Sep  4 07:41:06] NOTICE[7375]: chan_sip.c:23375 handle_request_invite:
Call from '' (213.136.81.166:9306) to extension '34422' rejected because
extension not found in context 'default'.

Thanks in advance,
-Motty
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