On some calls you just don't want any distractions so 
just Disable Disable Call Waiting

• Why put up with that annoying click or beep from an incoming call when your attention is on that important phone interview or conversation?

• Disable Disable Call Waiting and concentrate on one caller at a time.

• When you need a break from constant phone salesmen, turn Disable Call Waiting on.

• When activated, a second incoming call is automatically transferred to your voice mail box.

• Then when you are ready, retrieve the message by phone or by checking the Opex Online Portal.