Speaking on Deep Background, the Press Secretary whispered:
> 
> 
> 
> 
> When somebody in the office picks up a phone and dials EXTERNAL-911 how
> do the emergancy services know they are in one building rather than another
> office across town?

The PBX intercepts the call and uses special trunks to the PSAP;
it also has to send data telling where the caller is.

Here's one vendor: 
http://www.tonecommander.com/e911/How%20PBX%20ANI-LINK%20Works.htm



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