S.D. Codified Laws § 49-31-111
An originating carrier of nonlocal telecommunications traffic shall, in delivering its traffic, transmit signaling information in accordance with commonly accepted industry standards giving the terminating carrier information that is sufficient to identify, measure, and appropriately charge the originating carrier for services provided in terminating the nonlocal telecommunications traffic. If the originating carrier is delivering both intrastate and interstate nonlocal telecommunications traffic, the originating carrier shall separately provide the terminating carrier with accurate information including verifiable percentage measurements that enables the terminating carrier to appropriately classify nonlocal telecommunications traffic as being either interstate or intrastate, and to assess the appropriate applicable access charges. If accurate and verifiable information allowing appropriate classification of the telecommunications traffic is not provided by the originating carrier, the terminating carrier may classify all unidentified nonlocal telecommunications traffic terminated for the originating carrier as intrastate telecommunications traffic for service billing purposes.
SDCL 49-31-111