Zoom Phone will show a checkmark icon to help users identify robocalls and spam calls. The checkmark icon appears if the carrier has determined that the calling party is authorized to use the calling number.
STIR/SHAKEN is an industry standard that requires carriers to digitally sign calls originating from their customers. SIR/SHAKEN helps users identify robocalls and spam calls by determining if the carrier has authenticated the calling party, and they are authorized to use the calling number. Learn more on the FCC website.