Voice over Internet Protocol

Control and monitor the use of Voice over Internet Protocol (VoIP) technologies.

Controlling VoIP technologies starts with establishing guidelines and enforcing the appropriate usage that is described in organizational policies. Monitoring should include the users’ activity for anything other than what is permitted and authorized and detection of insecure or unauthorized use of the VoIP technology. Security concerns for VoIP include eavesdropping on calls and using ID spoofing to impersonate trusted individuals. Selecting a solution that can encrypt VoIP traffic is helpful in maintaining the confidentiality and integrity of the voice data. Example You are a system administrator responsible for the VoIP system. You configure VoIP for new users after being notified that they have signed the Acceptable Use Policy for VoIP technology [a]. You verify that the VoIP solution is configured to use encryption and have enabled requirements for passwords on voice mailboxes and on phone extension management. You require phone system administrators to log in using multifactor authentication when managing the system [a]. You add the VoIP software to the list of applications that are patched monthly as needed [a,b]. Finally, you configure the VoIP system to send logs to your log aggregator so that they can be correlated with those from other systems and examined for signs of suspicious activity [b]. Potential Assessment Considerations • Are VoIP technologies (e.g., approved and managed products or solutions) that may or may not be used in the system defined [a]? • Is monitoring for unapproved VoIP technologies or unapproved use of the allowed VoIP solutions employed [b]?