Security Considerations

• Disallow routes to countries that customers don't need, especially high fraud countries.
• Set a daily spending limit for all customers.
• Requiring long password lengths for phones and people.
• Educate customers on choosing good passwords.
• Have contracts to make sure the right person pays if they are hacked and run up a huge bill.

Some systems have easySysAdmin or fail2ban (for example) automatically block brute force SSH or SIP registration attacks.