You’re not alone. People with malicious intentions are scanning for open SIP servers all the time. Aster1sk from Geekhut.org posted a useful video for those of you using a badly configured FreePBX + Asterisk. I’m sure this will be useful for someone..
Getting phonecalls during the middle of the night on your Asterisk server?
Published on Dec 10, 2009 in asterisk, sip security