From the Highlights: "Priority Telecommunications Services leverage the public telephone network to provide telecommunication for national security and emergency preparedness during times of call congestion. We conducted this review in response to a hotline complaint regarding connectivity and testing of DHS' telecommunications services. Our objective was to determine whether DHS effectively supported operable and interoperable emergency communications for Federal, state, local, tribal, and territorial government officials and critical infrastructure operators during the COVID-19 [coronavirus disease 2019] pandemic."
Department of Homeland Security, Office of Inspector General, Report No. OIG-22-15
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/