# Tone Detection

## Description

The system can detect and analyze call progress tones that originate from the central office during the course of a trunk call.

## Conditions and Feature Interactions

None.

## Programming

1. Complete the ARS Call Progress Tone Detection form.

2. Reference the tone plan number from the ARS Call Progress Tone Detection form ( ) in the ARS Digit Modification Plans form ( ).

## Device Support

Not applicable

## Operation

None