SC.L2-3.13.14
Voice over Internet Protocol
Source and approval
CMMC Assessment Guide — Level 2 · Revision 2.13
Publisher approved · Complete cited source edition 2026-10-31
Read the official guideSee SC.L2-3.13.14 in the reference catalog with its NIST cross-references
Official requirement
Control and monitor the use of Voice over Internet Protocol (VoIP) technologies.
Assessment objectives
a. use of Voice over Internet Protocol (VoIP) technologies is controlled; and
b. use of Voice over Internet Protocol (VoIP) technologies is monitored.
Implementation guidance
Editorial examples to help you plan. Adapt them to your environment; the official requirement and objectives remain authoritative.
In plain language
Control and monitor Voice over Internet Protocol technologies.
Implementation example
Example from the source assessment guide (not a mandatory implementation): 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].
Evidence examples
Examples suggested by the source guide (not an exhaustive or mandatory checklist): System and communications protection policy; procedures addressing VoIP; VoIP usage restrictions; VoIP implementation guidance; system security plan; system design documentation; system audit logs and records; system configuration settings and associated documentation; system monitoring records; other relevant documents or records
Common mistakes
Treating internet-based telephony as unrelated to system security.