Hi everyone! I have found in the log files some international calls from unknown extensions. These extensions don't exist in my configuration. I tried to block them in my firewall (iptables on my freeswitch server) but they always use random IP adresses. Here is a short part of my Master.csv: "1001","1001","0015972595646444","2013-02-22 02:05:27","","2013-02-22 02:05:27","0","NORMAL_CLEARING","3c876eae-7cbe-11e2-877f-b791adff5763","","","","" "1001","1001","9011972595646444","2013-02-22 02:05:28","","2013-02-22 02:05:28","0","NORMAL_CLEARING","3d0d058c-7cbe-11e2-8783-b791adff5763","","","","" "1001","1001","2011972595646444","2013-02-22 02:05:29","","2013-02-22 02:05:29","0","NORMAL_CLEARING","3da55576-7cbe-11e2-8787-b791adff5763","","","","" "1001","1001","3011972595646444","2013-02-22 02:05:30","","2013-02-22 02:05:30","0","NORMAL_CLEARING","3e4727ca-7cbe-11e2-878b-b791adff5763","","","","" "1001","1001","4011972595646444","2013-02-22 02:05:31","","2013-02-22 02:05:31","0","NORMAL_CLEARING","3eecc2e8-7cbe-11e2-878f-b791adff5763","","","","" "1001","1001","5011972595646444","2013-02-22 02:05:32","","2013-02-22 02:05:32","0","NORMAL_CLEARING","3f633b94-7cbe-11e2-8793-b791adff5763","","","","" "1001","1001","6011972595646444","2013-02-22 02:05:33","","2013-02-22 02:05:33","0","NORMAL_CLEARING","3fc49902-7cbe-11e2-8797-b791adff5763","","","","" "1001","1001","7011972595646444","2013-02-22 02:05:33","","2013-02-22 02:05:33","0","NORMAL_CLEARING","403c0622-7cbe-11e2-879b-b791adff5763","","","","" "1001","1001","8011972595646444","2013-02-22 02:05:34","","2013-02-22 02:05:34","0","NORMAL_CLEARING","40e61ef0-7cbe-11e2-879f-b791adff5763","","","","" With my configuration, I need to be registered to make a call. I tried to call with an unregistered phone and I was not able to make a call. I don't know how they are able to do this but I need to block them. Is there something that I am missing in my configuration to block unwanted extensions to make calls? Thanks in advance! Fred