How do I block unwanted videoconference calls?

When I'm in a VC call I keep getting annoying callers trying to dial in; how do I block these unwa

1. Blocking when in a call:
   1. After you have established the VC call you want to make, and while you're in the call, press the OK button on your LifeSize remote.
   2. When the Call Management menu opens, scroll over to the right side and down to the bottom option, "Do Not Disturb", and press OK.
   3. DND is now engaged for the remainder of your current call. No other calls will get through. 
      1. Make sure that all parties you are expecting have joined prior to setting Do Not Disturb!