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..
Sandro Gauci, Enable Security
Getting phonecalls during the middle of the night on your Asterisk server?
Published on Dec 10, 2009 in asterisk, sip security
Sandro Gauci
CEO, Chief Mischief Officer at Enable Security
Sandro Gauci leads the operations and research at Enable Security. He is the original developer of SIPVicious OSS, the SIP security testing toolset. His role is to focus on the vision of the company, design offensive security tools and engage in security research and testing. Therefore, he is the proud owner of the title of Chief Mischief Officer at Enable Security.
He offers public office hours and is reachable here.