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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Hi Gary,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I went through this process a few times over the past few years.<o:p></o:p></p><p class=MsoPlainText>Theres a few short guides for securing Asterisk, but much of it depends on your design. If it’s a traditional POTs-type PBX then locking down IPs using firewalls is a great thing, however if you make use of inbound-SIP calls from end-user PC clients on the Internet then that’s not always possible.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>So heres my recommendations:<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>1) Change the default context name to something like "publicinbound".<o:p></o:p></p><p class=MsoPlainText>2) Create a context called publicinbound that does basically nothing.<o:p></o:p></p><p class=MsoPlainText>3) Setup a different context for an peer or friend IAX or SIP, or whatever. That way you can see which connection the hackers coming in from.<o:p></o:p></p><p class=MsoPlainText>4) If you don’t want to firewall off the whole internet, then at least make use of fail2ban - it’s a free scripted addon that watches for hacking attempts and firewalls them off.<o:p></o:p></p><p class=MsoPlainText>5) Really really long passwords and usernames - this ones pretty key. My first task was in going through and understanding where all the passwords were and changing them. I now make mine completely random and a min of 30 chars.<o:p></o:p></p><p class=MsoPlainText>6) IP restrictions. If a peer or user does have a fixed IP, then define it in the appropriate config file.<o:p></o:p></p><p class=MsoPlainText>7) The alwaysauthreject is good.. helps fumble the hackers.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thanks,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Adrian<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN><o:p> </o:p></span></p></div></body></html>