MSAG Master Street Address Guide
MSAG Master Street Address Guide : The MSAG ledgers are controlled by the municipality which has purchased the E911 ALI service, in that they assign which police, fire or rescue agency will serve a given street and number range. They do this by assigning an ESN to each street range, odd, even, community that is populated in the county or municipality served. These MSAGs are then used as a filter for service order activity into the E911 computer data base to assign ESNs to individual TN records. This insures that each customer will be routed to the correct agency for their particular address. In a non-ALI County, TAR codes are used by the Telephone company to assign ESNs to service conductivity and the County does not control the ESN assignment. TAR codes represent the taxing authority for the given subscriber which should correspond to their police, fire and rescue agencies. The MG method, of course, is more accurate because it is using the actual service address of the customer to route the call and provides the county with more flexibility in assigning fire and rescue district, etc. The Customer Services E911 Group maintains the E911 computer data base and interfaces with the County (customer) on all MSAG or data base activity
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