Glossary of Terms

Understand basic Public Safety definitions and terms.

TXT29-1-1

Definition:

A service that allows mobile phone users to text, rather than call, 9‐1‐1 during an emergency.

MT 9-1-1 SMSC

Mobile Terminated 9‐1‐1 Short Message Service Center. The MT 9‐1‐1 SMSC sends responses from the PSAP to the subscriber.

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E9-1-1 Service Provider

The entity responsible for establishing and overseeing the functions necessary to accept 9‐1‐1 calls from carriers and deliver to PSAPs using...

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E9-1-1

Enhanced 9‐1‐1. An emergency service capability that selectively routes the wireless or wireline emergency service call to the appropriate PSAP and...

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Tandem

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

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