Currently on the Radius 2.0.0 Sample Application, the following behavior will occur:
Transmitting with Radius SDK
The behavior broadcasting with LISNR Radius while using headphones is the same as if you were listening to music then took a phone call. On mobile platforms, the audio stream can’t be shared therefore the music will be interrupted.
By default the Radius SDK will force the tone transmission to occur on the mobile device speaker, not the headphones.
Receiving with Radius SDK
iOS - headphone audio may be paused during listening*
Android - headphone audio is not interrupted*
*Updates to Android OS and iOS may affect this behavior. OS version specific testing is recommended.