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Hello, recently I put a pbx on a public address, but as soon as I did it I was submerged by false call from an extension that didn't even exist. I found documentation about the fact that this behavior is caused by someone that impersonate e trunk. Now my question is how can I protect my trunk? I only have one patton and I don't want any other trunk, so is there any option in the pbx so that it asks for the trunks to be pre-configured, or that they have to do a signon? Also, is there a step by step guide somewhere about securing a pbx? i can use ten letter random passwords for my extensions, but if someone can simulate a trunk all my efforts are useless... Regards (I have a 4.5.0125 snomone pbx, I forgot to mention)