47 CFR § 64.706
Minimum standards for the routing and handling of emergency telephone calls
February 16, 2021
Upon receipt of any emergency telephone call, providers of operator services and aggregators shall ensure immediate connection of the call to the appropriate emergency service of the reported location of the emergency, if known, and, if not known, of the originating location of the call.
[61 FR 14981, Apr. 4, 1996]