How can I decode DTMF using Audacity and Multimon

This article assumes you have captured audio from your Digium card utilizing dahdi_monitor. You can find an instructional article at this link: How do I record calls using dahdi monitor

Programs you will need:

• Audacity: Multi-track audio editor for Linux/Unix, MacOS and Windows.  It is designed for easy recording, playing and editing of digital audio.

• Multimon: The executable name for Linux Radio Transmission Decoder, software that can decode a variety of digital transmission modes.

...