A common solution is to install a few analog lines at each location, for emergency calls only. But by making clever use of Caller ID (and adding a 'location' field to extensions.conf), it should be possible to properly identify the location of the caller:
exten => 1001,1,John Doe,1223 Bell Ave. Room 51
For this to work, you would have to be able to apply rules to the 911 context in a dial plan, to replace the *name* portion with the *location* portion.
A similar rule could be defined to drop other calls if 911 is dialed and all lines are busy (e.g. drop the lobby phone but not the front desk, or drop local vs. long distance, caller ID calls vs. non-identified calls, etc.).
Getting lengthy, better stop.
Dylan.
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