Glossary of Terms

Understand basic Public Safety definitions and terms.

Central Office

Definition:

A telephone switching center that contains the equipment to provide phone service to users in a particular geographic area. A central office may serve more than one prefix; there may be more than one central office located in the same building. Central Office equipment is primarily switching equipment that routes calls, provides dial tone, busy signal,
and ringing. Also known as End Office.

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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Location by-value

In the context of location information to support IP based emergency services, a PIDF‐LO containing the location of an IP end‐point that can be...

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Hand-off

The process by which the Mobile Telephone Switching Office (MTSO) passes a cellular phone conversation from one radio frequency in one cell to...

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Abandoned Call

An Abandoned Call is an emergency Call in which the caller disconnects before the Call can be answered by the PSAP (Public Safety Answering Point).

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