STIGQter 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 be configured to terminate and decrypt inbound and outbound SIP and AS-SIP sessions to ensure proper management for the transition of the SRTP/SRTCP streams.

DISA Rule

SV-259928r948774_rule

Vulnerability Number

V-259928

Group Title

SRG-VOIP-000480

Rule Version

SRG-VOIP-000480

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Ensure the DISN NIPRNet IPVS SBC is configured to terminate inbound and outbound SIP and AS-SIP sessions (messages). The SBC must be configured to decrypt the packets to determine the information needed to properly manage the transition of SRTP/SRTCP streams across the boundary. Also ensure the SBC establishes a new SIP or AS-SIP session for the "next hop" to the internal LSC or the far end SBC that fronts the destination LSC or MFSS.

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 terminate inbound and outbound SIP and AS-SIP sessions (messages) and decrypt the packets to determine the information needed to properly manage the transition of SRTP/SRTCP streams across the boundary.

Verify the SBC establishes a new SIP or AS-SIP session for the "next hop" to the internal Local Session Controller (LSC) or the far end SBC that fronts the destination Multifunction Soft Switch (MFSS). Inspect the configuration of the EBC to determine compliance with the requirement.

If SIP or AS-SIP messages are passed through the SBC without termination and decryption, this is a finding.

If the SBC is not configured to, or is not capable of, terminating and decrypting the SIP or AS-SIP messages, this is a finding.

If the SBC is not configured to, or is not capable of, understanding the contents of the decrypted SIP or AS-SIP messages, this is a finding.

If the SBC is not configured to establish a new SIP or AS-SIP session with the far end SBC that fronts the destination LSC or MFSS, this is a finding.

If the SBC is not configured to establish a new SIP or AS-SIP session with the LSC inside the enclave, 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-259928

Documentable

False

Rule Version

SRG-VOIP-000480

Severity Override Guidance

Verify the DISN NIPRNet IPVS SBC is configured to terminate inbound and outbound SIP and AS-SIP sessions (messages) and decrypt the packets to determine the information needed to properly manage the transition of SRTP/SRTCP streams across the boundary.

Verify the SBC establishes a new SIP or AS-SIP session for the "next hop" to the internal Local Session Controller (LSC) or the far end SBC that fronts the destination Multifunction Soft Switch (MFSS). Inspect the configuration of the EBC to determine compliance with the requirement.

If SIP or AS-SIP messages are passed through the SBC without termination and decryption, this is a finding.

If the SBC is not configured to, or is not capable of, terminating and decrypting the SIP or AS-SIP messages, this is a finding.

If the SBC is not configured to, or is not capable of, understanding the contents of the decrypted SIP or AS-SIP messages, this is a finding.

If the SBC is not configured to establish a new SIP or AS-SIP session with the far end SBC that fronts the destination LSC or MFSS, this is a finding.

If the SBC is not configured to establish a new SIP or AS-SIP session with the LSC inside the enclave, 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