Glossary of Terms

Understand basic Public Safety definitions and terms.

GSM

Definition:

Global System for Mobile Communications. The standard digital cellular phone service. GSM follows a set of ETSI
standard specifying the infrastructure for a digital cellular service.

GSX / SGX

A Sonus‐specific media gateway that converts a traditional wireline call into a VoIP call. One variant, SGX, converts SS7 signaling.

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Bearer Channel

A channel capable of transmitting all the information required for communication, such as user data, synchronizing sequences, and control signals.

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ESS

Electronic Switching System - Computerized switching of telephone calls used by the telephone company.

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Fixed Bridge List

The set of "star" codes that the PSAP can choose to assign to different destinations (like Poison Control). The numbers are PDSAP dependent, not ESN...

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