Use RingOut without touching your desk phone

We'd like to have the option to use the desktop app in conjunction with a desk phone like this: When dialing out (from the computer/app):

1) click an extension or click or dial a number.

2) your desk phone (e.g. J139) would go "off hook" on speakerphone and the call would be placed. No touches.

3) you simply wait for the other person to answer... you never touch your phone.