(I don't know how long this link will be good for, so you may wish to download the instructions)

The only change to this procedure is that instead of holding down the "P0" and "# "key, you need to hold down the "Side 1" button ( the button just above the PTT) and the "P0" button.

 

http://www.falcon-drilling.com/sites/default/files/f3021.pdf

 

To do this with a mobile, you will need a DTMF microphone and use the "P4" key instead of the "Side 1" button.