BellSouth E911 - Manual (Page 13)

CG-EWCG-001 Wireless E911 Guide
Issue 3, January 6, 2004 Overview of E911
1.3 Databases Required to Support E911
Three (3) data files (or databases) are required to provide the data for display at the PSAP:
• Master Street Address Guide (MSAG)
• Telephone Number (TN) Database
• E911 Tandem/Network Information (TN/ESN)
1.4 Master Street Address Guide (MSAG)
The MSAG contains all street information in the full featured E911 service area. The Emergency Service
Numbers (ESNs) are assigned to the streets for routing 911 calls to the proper PSAP. As data records for
the pseudo-ANI telephone numbers are processed from the wireless carriers, the address information on
the data record is validated against the MSAG. Address information on the data records must exactly match
the MSAG information or the data records will be considered an error and returned to the wireless carrier
for correction. Data records are not posted to the database until they pass validation.
1.5 Telephone Number (TN) Database
The TN database contains all of the wireline subscriber records and wireless pseudo-ANI records for all
carriers in the E911 service area. This information includes the telephone number, name of the wireline
subscriber, address, location, class and type of service. For the wireless carrier, it includes the pseudo-ANI
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