JN>  How does the dispatcher know the caller's name if they're at a pay
 JN> phone?
 JN>  How does the dispatcher know the caller is handicapped or has some
 JN> other  medical problem if they use a pay phone?
They don't.  All that will display is the fact that it is a pay phone, 
(If it was set up that way) the number, and the address, unless someone
in the dispatch center adds more information, such as "In the break room
in the rear center of the manufacturing plant"
 JN>  That's not the kinda data your local phone company is compiling.
Correct.
 JN>  Betcha all E911 gives the dispatcher is an address and phone number,
 JN> and  the rest of that data is in the communication center's computer. 
 JN> That's  the sort of information the fire companies gather when they're
 JN> out of the  station conducting pre-fire inspections and planning.
Correctamundo again.  The information that you are talking about, is called
the "ADI".  Your normal data for E911 consists of ANI, ALI, and ADI.  ANI
is provided by the telephone company, and stands for Automatic Number 
Identification.  ALI, which can be provided by either the local telco,
another company under contract, (Which may be another telco, many miles
away from your area), or in the database at the 911 center.
ADI, Automatic Detail Information, has to be handloaded, into the computer
at the 911 center.
Many E911 centers still do not have ADI, just ALI and ANI.
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