End User

Definition:

The 9‐1‐1 caller. Customers who use (rather than provide) telecommunications services; those who either originate or

terminate telecommunications.

TIA

Telecommunications Industry Association. The primary standards body for U.S. telephony.

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UMTS

Universal Mobile Telecommunications Systems.

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TDD

Telecommunications Device for the Deaf. Used in 7‐1‐1 call services. 7‐1‐1 is assigned nationwide for access to Telecom Relay Services (TRS). TRS...

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TRS

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

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