I am getting hammered by Chinese “war dialing” from IP 18.104.22.168 and 22.214.171.124. My CDR Report has hundreds of these entries:
2010-02-10 12:06:45 asterisk 711 SIP/126.96.36.199-08e5fac8 SIP/711-08edf278 ANSWERED 36(extension 711 is the extension that rings “if all else fails”)
I am using FreePBX 188.8.131.52 on Asterisk 1.4.24 and have a SIP trunk provider. How can I change my configuration to only accept SIP connections/calls from my SIP trunk provider?
I have searched and searched, but all the configuration info I find tells me how to include my provider, not how to to exclude others. Found an interesting blog about it here http://ericrichardson.com/2009/12/1757-the-phone-is-ringing, but no solution to the problem.
Thanks in advance,