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PSAP Boundaries
Every PSAP has a service area
All calls from within that boundary must go to that PSAP
PSAP boundaries do not necessarily lie on neat (e.g. City, County) boundaries
The DEFINITION of a PSAP boundary is currently done on a street/number basis, which has been manually translated into a point/polygon form also
Dealing with non-trivial boundaries is the big problem in routing calls
PPT Version