question on the 2 call system if I am trying to get a provider to come to my hotel.

1) I figure if providers do a 2 call system to get johns to come to them, why shouldn't I?

2)how is this executed? (please explain in detail)

3) what's the rationale of having the provider call you first, then have her call you again once she's at your hotel?

The 2 call system is for the providers protection.

If you have done your research before contacting that beautiful lady, there is no reason for a hobbyist to ask for a 2 call.  

The other thing you should consider is that the majority of providers will pass on seeing you if you put this as a requirement for an outcall.

Do your research and trust your instincts.

I usually want to have a glimpse into the lobby/elevator, etc. This is info that I give when I am hosting at a hotel. I also call when I am on my way. We all want to know what our future holds.

The two call system is used by providers to prevent the possibility of a guy showing up unannounced for an appointment.  You call once for the hotel name and upon arrival for the room number

There is really no reason for a customer to use it unless you are using a provider who is too stupid to tell time...

There's no reason why a provider going to an outcall could not 2 call.  I don't think I'd withhold the room number...  but it would be nice if she called before coming up so I could meet her at the door...  
skb

Once my date calls from the lobby, I can give her details on where the elevators are, etc.  I will also put the bar across the doorway so she doesn't have to stand in the hallway waiting for me to answer her knock.

Providers need to know the hotel, room number, and your name before they leave for your hotel so that they can call the front desk and make sure you're actually registered at the hotel.  Prevents pranksters from wasting our time.

Also, it's awfully ignorant to assume that "if she can do it, so can I". This isn't tat for tit.
We're more vulnerable physically and legally than you are.  You either follow our rules, or find someone who's naive enough to follow yours.

Thanks to all for the feedback! Much appreciated.