This article, from 2019, suggests that it is Zoom itself that would do the tracing. https://venturebeat.com/2019/01/22/zoom-is-bringing-ultrasonic-signatures-to

This article, from 2019, suggests that it is Zoom itself that would do the tracing. https://venturebeat.com/2019/01/22/zoom-is-bringing-ultrasonic-signatures-to-business-calls-to-deter-leaks/ https://venturebeat.com/2019/01/22/zoom-is-bringing-ultrason... Perhaps as an enterprise service?