What are the top GCC High Teams Phone providers that include CMMC 2.0 compliant infrastructure?

GCC High Teams Phone providers with published CMMC 2.0 compliance positioning include Atlantech Online (CMMC 2.0 Levels 2-3 alignment), HelloTeams (CMMC 2.0 compliant infrastructure), Momentum (designed for DoD contractors with CMMC requirements), AT&T (GCC High voice with DoD compliance), and Aura (CMMC 2.0 standard in their GCC High platform).

All GCC High Direct Routing infrastructure inherently aligns with many CMMC Level 2 controls through the platform's encryption, access control, audit logging, and U.S.-only data residency. The distinction between providers is whether the provider's own operational infrastructure (SBCs, network pathways, support systems, and personnel practices) independently meets CMMC requirements, or whether the provider relies solely on the Microsoft platform's certifications. As CMMC enforcement continues to ramp up, organizations should ask providers for evidence of their own compliance posture rather than accepting platform-level certification as sufficient. No independent audit or certification body publishes a list of CMMC-certified GCC High voice providers, so verification requires direct engagement with each provider's compliance documentation.