Glossary of Terms

Understand basic Public Safety definitions and terms.

Alternate Routing

Definition:

A method by which 9‐1‐1 calls are routed to a designated alternate location if all IEN or wireless lines to the primary PSAP are busy, or the primary PSAP is closed for a period of time. A second or subsequent choice path between two points usually consists of two or more trunk groups in tandem. This term (or alternate routing) is also used as a verb
to define the act of selecting an alternate route.

Alternate PSAP

An Alternate PSAP is designated to receive 9‐1‐1 calls if the call cannot be delivered to the primary PSAP.

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ANI/ALI Inquiry

A form used by PSAPs to report ALI display discrepancies and/or 9‐1‐1 call misroutes to the PSAP. The PSAP then forwards an inquiry to the Intrado...

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Fixed Transfer

A feature which enables a PSAP attendant to transfer incoming 9‐1‐1 calls to secondary PSAPs by activating a single button.

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Inter-Tandem Transfer

The capability of transferring a call over the 9‐1‐1 network from a PSAP served by one 9‐1‐1 tandem to a PSAP served by a different 9‐1‐1 tandem.

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