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Ensure that VoipNow and the operating system are up-to-date.  

Use credit limits

To prevent accounts from exceeding a certain amount of credit, you need to set specific credit limits in your charging plan.

You need to always use money limits on extensions. When the fraud is attempted by the extension owner, it may be one of the few measures that can prevent it. Also, it's important that you that you do not rely on concurrent call limits to limits to protect your system.  

Create strong SIP passwords

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• Use iptables firewall rules to allow only certain IPs/ranges to register.
• Use fail2ban to block IPs that fail to register many times.

Restrict calls

• Restrict international Restrict international calls using routing rules and/or your charging plan.
• Restrict calls outside business hours.
• Monitor call patterns and set up thresholds to alert you in case of unusual activities (high numbers of call attempts per hour, for example).

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