Listen to External Audio while on the Phone.

Have you ever wanted to listen to music or a podcast while waiting on hold? Simply connect Voice Over between the handset and base of your telephone. The stereo audio cable connects to a line output or headphone output on your smartphone, computer, or audio player. Voice Over mixes the left and right audio input signals with the caller's voice in the telephone handset earpiece. The caller never hears your added audio source. On most phones you can even listen to audio between phone calls, while the switchhook is down.