I sort of understand what you're doing. I think you might have an overly complicated setup. Let me tell you what I think you're trying to do, and then we'll talk about how to make it happen:
#1 - You call into a conference. The conference moderator has caller controls that general members do not. (BTW, the way you have it set now, *everyone* will have the option to press 2. You may not mix conference profiles in the same conference. In other words, every member of the conference must have the same caller control group. If you want to have the moderator have extra commands then I strongly recommend "bind_digit_action")
#2 - The moderator (you) presses 2 and gets dial-tone. You dial someone else's mobile phone number and then you are returned to the conference room.
#3 - The number you entered in step #2 is called and added to your conference.
Is that correct? I don't want to spend any more time on this unless I know the exact steps that you want to have happen.