Glossary of Terms

Understand basic Public Safety definitions and terms.

GRISIP

Definition:

Geographic Routing Interface Session Initiation Protocol. SIP used between the SBC/P/ECSCF and SBC/FMCC in order to
obtain routing numbers for routing of the call to the PSAP. SIP is also used between the SBC/P/E‐CSCF and SBC/Intrado
Peering Network for call establishment to the PSAP.

Selective Router Bridge/Transfer

A scenario where IEN Voice has delivered a call to a PSAP supported by IEN Voice. That PSAP chooses to bridge on a PSAP that is not connected...

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Busy Tone

The sound provided to a caller to indicate the desired destination is unavailable. (60 IPM (interruptions per minute).)

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Real-Time

An operating mode in which the information to be handled is sent, processed, and returned in a time interval that is short relative to the...

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A-GPS (Assisted-Global Positioning System)

A-GPS (Assisted-Global Positioning System) is a system that often significantly improves the startup performance—i.e., time-to-first-fix (TTFF)—of a...

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