Click and drag the end of a cable to connect it to an empty port. You'll need to connect both ends to different ports to start a call. Some calls list the correct port while others only appear as question marks. Hover over your directory at the bottom of the screen to find the correct port!
You can disconnect a call when the lights on each port stop flickering by right-clicking on the end of any connected cable.
Try for a high score in Score Attack, or take it easy in Chill Mode!
HINT: If you're getting overwhelmed with calls, click the "HOLD" button to put the call on hold and get yourself some extra time!