WE JUST GOT A SECOND LINE PUT ON OUR PHONE, WONT...

I HAVE A RCA EXECUTIVE SERIES PHONE. WE JUST HAD OUR PHONE COMPANY HOOK UP ANOTHER LINE TO OUR PHONE. IT HOLDS UP TO 4 LINES. WE HAVE THE BASE PHONE CONNECTED TO THE SYSTEM AND A CORDLESS. BOTH LINES WORK, BUT LINE ONE RINGS WHEN YOUR ON IT, BUT LINE TWO DOESNT RING WHEN SOMEONES ON LINE ONE. WE WONT BE ABLE TO TELL WHEN ANOTHER LINE IS COMING IN, EXCEPT FOR THE MAIN SYSTEM BLICKS ON LINE TWO BUT DOESNT RING. WE LOOKED AT THE MENU ON THE PHONE BUT CANT FIGURE OUT HOW TO MAKE IT RING. IT SAYS THE RINGER IS TURNED ON LINE ONE AND TWO. HELP PLEASE!