The Customer Edge Router (CER) must route all inbound traffic to the data firewall function except AS-SIP-TLS and SRTP/SRTCP, which must go to the Session Border Controller (SBC).

From Voice/Video over Internet Protocol (VVoIP) STIG

SV-21804r2_rule The Customer Edge Router (CER) must route all inbound traffic to the data firewall function except AS-SIP-TLS and SRTP/SRTCP, which must go to the Session Border Controller (SBC).

Vulnerability discussion

The CER is the first line of defense at the gateway to the enclave or LAN. The data firewall and SBC functions are the second line of defense. Since the SBC function only processes VVoIP traffic in the form of AS-SIP-TLS and SRTP/SRTCP packets, the CER should only forward these packets to the VVoIP firewall.

Check content

Review site documentation to confirm the CER routes all inbound traffic to the data firewall function except AS-SIP-TLS and SRTP/SRTCP, which must go to the SBC. This supports the VVoIP system connecting to the DISN WAN for VVoIP transport between enclaves and the system providing Assured Services to any Command and Control (C2) user (Special-C2, C2, or C2-R). If the CER does not route all inbound traffic to the data firewall function except AS-SIP-TLS and SRTP/SRTCP, this is a finding.

Fix text

Implement the CER to route all inbound traffic to the data firewall function except AS-SIP-TLS and SRTP/SRTCP.

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