help 3 way calling dont work!!!!!!

[f22b1t]

I used just go in the menu & was able to hit hold or confrence & link the calls. Now neither of those feature are not in the menu. If I have a 3rd way call coming in I have to make him/her hang up, than I have to call him back to make the 3 way work. That sucks! I've been seaching for a way to make this possible again.