Extension mirror

I have an executive assistant who wants to have the Presidents phone on her polycom phone as well. She would like to be able to answer and also give the President the ability to answer. I would also like either to be able to put the call on hold and either to be able to pick it up. The problem I am having is when the Assistant tries to transfer the call to the President it just rings back to her. I have set up following from ext 001 to 000 from the president to Executive Assistant as I have setup an extension on line 2 on her phone. The system is freepbx and asterik