Systems, devices, and methods for assistive listening that uses sound waves for devices pairing is described herein. An assistive listening system may use sound waves to pair mobile devices acting as assistive listening devices with stationary devices. To establish a communication link (e.g., pair the two devices), a mobile device may exchange a plurality of signals over a plurality of sound waves with a stationary device. The plurality of sound waves may operate in a set of frequencies above a frequency range detectable by a human ear (e.g., above 20 kHz). After the pairing procedure over the sound waves is complete, the assistive listening system may use electromagnetic waves to pair the mobile devices with the stationary devices over a wireless access technology, such as Digital Enhanced Cordless Telecommunications (DECT).