Asterisk Courses
Udemy Creating a Playful Telephony Network with Asterisk - Part 3
Playful Technology via YouTube Creating a Playful Telephony Network with Asterisk - Part 2
Playful Technology via YouTube Open Sesame! Conversations With My Front Door
Devoxx via YouTube Eventphone Telefonanlage: Funktionsweise und neue Features
media.ccc.de via YouTube