Tandem Office
Tandem Office : Telephone central office which serves as a tandem (or hub) for all 911 calls. Must be a 1AESS type of central office. The tandem office translations contain the TN/ESN relationships which route the 911 call to the proper SAP. The tandem office looks up the ANI (TN) that it receives from the end office and finds the ESN (routing information) which corresponds to a seven digit number ringing in at a PSAP
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