Technical information

Glossary

Issue 7 June 2001 GL-11

Service Observing

The monitoring of actual calls in progress for security purposes.

Station Message Detail Recording

Creates call records for incoming and outgoing calls.

System Manager

A person responsible for specifying and administering features and services for the PBX system.

TAC

Trunk Access Code

TCM

Traveling Class Mark

TSC

Technical Service Center

TTI

Terminal Translation Initialization

Tandem Tie Trunk Network

A private network that interconnects several customer switching systems by dial repeating tie

trunks. Access to the various systems is dictated by the codes that are individually dialed for each

system.

Telecommunications Fraud

The unauthorized use of a company’s telecommunications system. Also called any of the following:

telephone abuse, toll fraud, phone fraud, call fraud.

Tie Trunk

A telecommunications channel that directly connects two private switching systems.

Toll Analysis

Specifies the routing of toll calls, including numbers to be assigned to the Restricted Call List and

the Unrestricted Call List.

Toll Restriction

Prevents the user from making toll calls unless the number is specified on an Unrestricted Call List.

Trunk Group

Telecommunications channels assigned as a group for certain functions that can be used inter-

changeably between two communications systems or Central Offices.

Trunk Access Code

A digit assignment assigned during trunk administration that identifies the trunk.

UCL

Unrestricted Call List