Glossary:

ATIS Telecom Glossary

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Legacy PSAP Gateway

The LPG is a signaling and media interconnection point between the NG9-1-1 Emergency Services Network and legacy PSAPs. It is responsible for interworking the SIP signaling to the Traditional MF or Enhanced MF (E-MF) signaling supported by the legacy PSAP and is responsible for providing emergency services-specific processing associated with transfer requests to and from legacy PSAPs and for processing… (Read More →)

Legacy PSAP Gateway (LPG)

The LPG is a signaling and media interconnection point between the NG9-1-1 Emergency Services Network and legacy PSAPs. It is responsible for interworking the SIP signaling to the Traditional MF or Enhanced MF (E-MF) signaling supported by the legacy PSAP and is responsible for providing emergency services-specific processing associated with transfer requests to and from legacy PSAPs and for processing… (Read More →)

Legacy Selective Router Gateway

The LSRG provides an interface between 9-1-1 Selective Routers and NG9-1-1 Emergency Services Networks. It enables calls to be routed and/or transferred between Legacy and NG9-1-1 networks. It is used in some network deployment models for the transition from Legacy 9-1-1 to NG9-1-1.

Legacy Selective Router Gateway (LSRG)

The LSRG provides an interface between 9-1-1 Selective Routers and NG9-1-1 Emergency Services Networks. It enables calls to be routed and/or transferred between Legacy and NG9-1-1 networks. It is used in some network deployment models for the transition from Legacy 9-1-1 to NG9-1-1.

length indicator (LI)

A six-bit field that defines message length and that is used to differentiate between message signal units, link status signal units, and fill-in signal units. [T1.226-1992]

LEO

Abbreviation for low Earth orbit. A term used to describe the orbital altitude range (500 to 2000 km above the surface of the Earth) of certain communications satellites.
Note 1: Generally, LEO satellites are part of constellations of satellites that achieve wide coverage of the Earth's surface with lower power requirements and shorter propagation delays than can be achieved with,… (Read More →)

LER

Label Edge Router

LERG

See LERG™ Routing Guide

(LERG™ Routing Guide is a trademark of Telcordia Technologies, Inc. , dba iconectiv, LLC. )

LERG� Routing Guide

The iconectiv® LERG™ Routing Guide is an output from the BIRRDS database. It is used by Service Providers (SP) and other carriers as a common means to reflect and exchange current and planned Central Office (CO) Code (NPA-NXX) and Thousands-Block (NPA-NXX-X) assignments along with associated routing data. Data is provided for all SPs in the North American Numbering Plan (NANP).… (Read More →)

Letter of Agency (LOA)

A written or electronically signed document to obtain authorization and/or verification of a Toll-Free Subscriber's request to change their preferred Service Provider.

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