[cisco-voip] e911 & Cisco Emergency Responder ?

[TechGuy]

I have a basic e911 question, particularly in regards to Cisco
Emergency Responder.

Is the primary idea behind rolling out e911 is to pin point actual
physical location, say like all the way down to where a person or
phone is located in a cube?

Thats what I am being asked to look into.  A solution that provides
cube location if you will.  We have large locations all over the
state, some buildings with multi floors, and so on.  I have heard and
read examples of e911 being used for identifying buildings and
locations when using VoIP, I have heard of it being used for
identifying buildings and even floors within in a building.

I am a bit confused however as to how you do this and particularly in
regards to mapping things all the way down to the cube or something.
It would be fine I guess in an environment that was not dynamic and
phones could be locked down so they couldn't move.  Some how match the
mac of the phone to the port on the switch, which you would have to
map to the cube or something.  I would think administering this would
be a nightmare since things can easily change.  Someone could change
something in a wiring closet, or move phones or something.

Just wondering how people are doing this, if they are?   Its something
management seems to really want to move on, and I am bit unsure about
it all.  Guess I need to read a little more on the emergency responder
product from Cisco and that might help.  We are an all Cisco shop,
data and telephone.  So emergency responder appears to be the logical
next step.  Really just don't get how people are managing the
locations and the changes, guess there is a way to automate some of it
as long as your wiring closets dont get messed with.  If you know cube
xyz is always patched to switch abc, port 4 then its not that
difficult to imagine a way to script pulling the mac table off a
switch and seeing what mac is associated to what port I guess.

Ah well, just wanted to throw it out there here from others and maybe
get pointed to some resources others have utilized in this very issue.