Glossary of Terms

Understand basic Public Safety definitions and terms.

DID

Definition:

Direct Inward Dialing. A feature offered on PBX accounts that allows a phone number to ring through directly to a
specific phone at a business instead of going to a menu or queue and needing to dial an extension.

Wireless Phase 0

0 Required by FCC. The delivery of a wireless 9‐1‐1 call (where 9‐1‐1 are dialed digits) to a PSAP.

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FGD or FG-D

Feature Group D. An MF signaling protocol, originally developed to support equal access to long distance services, capable of carrying one or two...

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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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BST Quick Service

BellSouth service which provides the ability for disconnected TNs to dial 9‐1‐1 or the AT&T‐SE Business office. These TNs cannot dial out for any...

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