Glossary of Terms

Understand basic Public Safety definitions and terms.

Seize, Seizure

Definition:

An action of a switching system in selecting an outgoing trunk or other component for a particular call.

Trunk Seizure

The point in time at which a 9‐1‐1 call is assigned to a trunk and acknowledgment is provided by the equipment at the distant end.

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PSAP, Secondary

The Secondary PSAP receives emergency calls from the 9‐1‐1 network only as a result of a transfer. The Secondary PSAP never receives first routed...

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Cell Sector or Cell Face

An area consisting of a certain portion or all of the total coverage area of a cell site. One face of a cell antenna, typically three‐sided, that...

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Selective Routing

The capability to route a call to the particular PSAP based on the geographical location from which the call originated. Selective routing is...

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