From Voice Video Policy Security Technical Implementation Guide
Part of SRG-POL-400019
Associated with: CCI-002073
Organizations must carefully consider the risks that may be introduced when information systems (i.e., system interconnections) are connected to other systems with different security requirements and security controls, both within organizations and external to organizations. Authorizing Officials must determine the risk associated with information system connections and the appropriate controls employed. Risk considerations also include information systems sharing the same networks.
If the Voice Video system only uses individual PSTN subscriber lines terminated on individual phones, a dedicated key system, or a dedicated PBX, which is isolated from all DoD networks, this is not applicable. This configuration will not support DISN Voice Precedence user requirements. Review each Voice Video system security plan (SSP). Confirm the organization implements and documents the MG and any SG used to connect an unclassified Voice Video system to DISA SBU Voice. Interconnected networks supporting mission-critical decision-making users must provide for DISN Voice Precedence and Assured Service to be conducted across the gateway. Verify that local DISA SBU Voice access for intra-DoD dialup services to/from a Voice Video system within a site enclave and a DSN number is via a local MG to a circuit-switched DSA SBU Voice service. Enclaves supporting DISN Voice Precedence must use one or more T619A trunks providing multilevel precedence and preemption (MLPP) functionality. Enclaves not supporting DISN Voice Precedence may use PRI or CAS trunks. The following exceptions apply: - The VoIP system within the enclave is approved for DISA SBU Voice IP service. - The VoIP system within a site enclave is subtended to a larger enclave. - The enclave is part of an organizational intranet connected using dedicated circuits or VPN tunnels, whether site-to-site or meshed. If each Voice Video SSP does not implement and document the MG and any SG used to connect an unclassified Voice Video system to DISA SBU Voice, this is a finding. If the documented MG and any SG do not provide DISN Voice Precedence and Assured Service to support mission-critical decision-making users, this is a finding. Note: Trunks that support SS7 signaling and SS7-based signaling between a DoD network and a non-DOD network are prohibited.
Implement and document the MG and any SG used to connect an unclassified Voice Video system to DISA SBU Voice. Interconnected networks supporting mission-critical decision-making users must provide for DISN Voice Precedence and Assured Service to be conducted across the gateway. Local DISA SBU Voice access for intra-DoD dialup services to/from a Voice Video system within a site enclave and a DSN number must be through a local MG to a circuit-switched DSA SBU Voice service. Enclaves supporting DISN Voice Precedence must use one or more T619A trunks providing multilevel precedence and preemption (MLPP) functionality. Enclaves not supporting DISN Voice Precedence may use PRI or CAS trunks. Note: Trunks that support SS7 signaling and SS7-based signaling between a DoD network and a non-DOD network are prohibited.
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