Marshalled by North Carolina Attorney General Josh Stein, New Hampshire Attorney General Gordon MacDonald, and Indiana Attorney General Curtis Hill, attorneys general from all 50 states and Washington, D.C. announced on August 22, 2019 that they reached an agreement with 12 major voice service providers* on eight principles to prevent illegal robocalls and improve enforcement efforts.

The first four principles of the agreement concern the internal operations of voice service providers and ask that they: (1) provide call blocking and notification software free of charge to consumers, (2) implement STIR/SHAKEN, (3) pay attention to network traffic for signs of high-volume traffic consistent with robocall operations, and (4) investigate suspicious calling behavior and patterns. The latter four principles relate to activities involving other carriers and government officials: (5) confirm a new commercial VoIP customer's identity by collecting information on them, (6) require traceback cooperation in all new and renegotiated voice transport contracts, (7) direct resources towards completing traceback requests from law enforcement, and (8) maintain open communication and cooperation with state attorneys general.

In a press release from the same day, FCC Chairman Ajit Pai praised the agreement, saying, "These principles align with the FCC's own anti-robocalling and spoofing efforts."

*Voice provider signees are AT&T Services, Inc., Bandwidth Inc., CenturyLink, Charter Communications, Inc., Comcast, Consolidated Communications, Inc., Frontier Communications Corporation, Sprint, T-Mobile, U.S. Cellular, Verizon, and Windstream Services, LLC.