STIGQter: STIG Summary: Enterprise Voice, Video, and Messaging Policy Security Requirements Guide Version: 1 Release: 4 Benchmark Date: 05 Jan 2026:

The Session Border Controller (SBC) must drop all SIP and AS-SIP packets except those secured with TLS.

DISA Rule

SV-259932r948778_rule

Vulnerability Number

V-259932

Group Title

SRG-VOIP-000520

Rule Version

SRG-VOIP-000520

Severity

CAT II

CCI(s)

• CCI-001548 - Defines the information flow control policies for controlling the flow of information within the system.

Weight

10

Fix Recommendation

Ensure the DISN NIPRNet IPVS SBC is configured to drop the following signaling packets:
- SIP packets arriving on IP port 5060 or 5061.
- SIP packets arriving on IP port 443 not secured with TLS.
- AS-SIP packets arriving on IP port 5060.
- AS-SIP packets arriving on IP port 5061 not secured with TLS.

NOTE: The VVoIP system may allow SIP and SRTP traffic encrypted and encapsulated on port 443 from Cloud service providers.

Check Contents

Verify the DISN NIPRNet IPVS SBC is configured to drop the following signaling packets:
- SIP packets arriving on IP port 5060 or 5061.
- SIP packets arriving on IP port 443 not secured with TLS.
- AS-SIP packets arriving on IP port 5060.
- AS-SIP packets arriving on IP port 5061 not secured with TLS.

If all SIP and AS-SIP packets are not dropped, except AS-SIP packets secured with TLS arriving on IP Port 5061 and SIP packets secured with TLS arriving on IP Port 443 secured with TLS, this is a finding.

NOTE: The VVoIP system may allow SIP and SRTP traffic encrypted and encapsulated on port 443 from cloud service providers.

Vulnerability Number

V-259932

Documentable

False

Rule Version

SRG-VOIP-000520

Severity Override Guidance

Verify the DISN NIPRNet IPVS SBC is configured to drop the following signaling packets:
- SIP packets arriving on IP port 5060 or 5061.
- SIP packets arriving on IP port 443 not secured with TLS.
- AS-SIP packets arriving on IP port 5060.
- AS-SIP packets arriving on IP port 5061 not secured with TLS.

If all SIP and AS-SIP packets are not dropped, except AS-SIP packets secured with TLS arriving on IP Port 5061 and SIP packets secured with TLS arriving on IP Port 443 secured with TLS, this is a finding.

NOTE: The VVoIP system may allow SIP and SRTP traffic encrypted and encapsulated on port 443 from cloud service providers.

Check Content Reference

M

Target Key

5585