When I have a call, I pick up the handset but the phone keeps ringing. I have to press the answer button after picking up the phone to answer the call. How can I answer the call just by picking up the phone without pressing answer? Also, when making a call I have to press new call first. I can't make a call just by picking up the handset. If I pick up the handest there is no dial tone, to get a dila tone I then have to press new call.