Blocking calls...

[#1]

Is it possible to block out going calls to mobiles...our daughter has got into the habit of ringing mates from our landline...
And its getting a bit of a painhaving to take the phone to work with me everyday!! 

[#2]

apparently not

[#3]

how about one of these  http://www.phonesandheadsets.com/

[#4]

Hmmm,,,a roll of duck tape might do the trick!!!...cheaper!