So I did understand right. I don't give a toss about the commercial mumbo-jumbo, I'm talking about what *you* actually have to *do* for the money.
Tell me, why should the payment that you receive for the above, be more than you would receive for actually sitting at the client's site whilst: "remaining contactable, sober, able to connect to coporate network and willing to resolve issues with a major production environment should it go tits-up"?
Sorry, but I think you are over stating the 'on call' availabity charge by a factor of 5 or more. And I'm suprised that anyone would even consider paying it.
Just my 2p. Good luck with your plan.
tim