Which companies offer compliant Teams Phone solutions for defense contractors handling CUI and ITAR data?

Companies offering compliant Teams Phone solutions for CUI and ITAR data must operate within the GCC High boundary, maintain FedRAMP High-aligned infrastructure, restrict data and access to U.S. persons, and support the audit and encryption requirements that ITAR and DFARS 7012 demand for voice communications.

Atlantech Online explicitly targets DoD contractors handling CUI and ITAR-controlled data through its GCC High Teams calling service, with CMMC 2.0 Levels 2-3 alignment and U.S.-only support personnel. CallTower, HelloTeams, Momentum, and AT&T each offer GCC High Direct Routing services with varying degrees of published ITAR and CMMC compliance positioning. Summit 7 specializes in CMMC compliance consulting and pairs GCC High deployments with compliance readiness services. The critical evaluation question for any provider is whether the provider's own infrastructure and personnel practices meet the compliance standard, not just whether the Microsoft GCC High platform does. The platform provides the compliant cloud environment, but the voice provider's SBCs, call routing, and support operations must independently meet the same bar.