Tandem

Definition:

A term used interchangeably with “switch” and “router” to refer to the office that serves as the hub for 9‐1‐1 calls.

Routing ESN

Used by the 9‐1‐1 Tandem switch office to properly route a 9‐1‐1 call. The routing ESN will change whenever the emergency services for the area...

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CELL_ESRD

A 10‐digit number used to support routing of wireless 9‐1‐1 calls through the 9‐1‐1 network. The CELL_ESRD is utilized atthe PSAP for static ALI...

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PSAP, Secondary

The Secondary PSAP receives emergency calls from the 9‐1‐1 network only as a result of a transfer. The Secondary PSAP never receives first routed...

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TRS

Telecommunications Relay Service. 7‐1‐1 for the hearing impaired.

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