Dedicated Trunk

Definition:

A telephone circuit used for a single purpose, such as transmission of wireless 9‐1‐1 calls.

Inter-Tandem Transfer

The capability of transferring a call over the 9‐1‐1 network from a PSAP served by one 9‐1‐1 tandem to a PSAP served by a different 9‐1‐1 tandem.

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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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TTY

Teletypewriters. Text Telephone used in 7‐1‐1 call services. 7‐1‐1 is assigned nationwide for access to Telecom Relay Services (TRS). TRS allows...

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