Excerpt from the article:

Hear the airport's control tower in Seville (TWR LEZL) . This code is ready to collect real-time audio streaming from a source on the Internet where he leaves his radio tower broadcasts, and proof of concept allows us to see some of the opportunities the system without having a radio in our system . In this way, we can assign the background music "radio" for when a call for a DID, an extension or a queue of agents.

First, edit the file musiconhold_custom.conf and add the following:

[Radio]
mode = custom
dir = / var/lib/asterisk/mohmp3/radio
application = / usr/bin/mpg123-q-r 8000-f 8192-s-mono http://bos.liveatc.net/lezl

Reload the Asterisk configuration MoH
[User @ asterisk] asterisk-vvvvvvr

voip * CLI> moh reload
== Parsing '/ etc / asterisk / musiconhold.conf': Found ==
== Parsing '/ etc / asterisk / musiconhold_custom.conf': Found ==
== Parsing '/ etc / asterisk / musiconhold_additional.conf': Found ==

voip * CLI> moh show classes
Class: default
Mode: files
Directory: / var / lib / asterisk / moh
Class: none
Mode: files
Directory: / var / lib / asterisk / moh / .nomusic_reserved
Class: radio
Mode: custom
Directory: Nodir
Application: / usr/bin/mpg123-q-r 8000-f 8192-s-mono
http://bos.liveatc.net/lezl
Format: slin

voip * CLI> reload

Create a "custom extension" for this purpose:

[Asterisk root @] vi extensions_custom.conf
; Special LiveATC Extension
exten => 6000.1, Answer
exten => 6000.2, MusicOnHold (radio)