What is Asterisk? for TADSummit Asia 2020
Asterisk is an open-source framework for building multi-protocol, real-time communications applications and solutions.
A simpler definition:
Asterisk is an open-source software package that converts an ordinary computer into a communication server
https://www.asterisk.org
https://community.asterisk.org
https://wiki.asterisk.org
Astricon: is the annual trade show and conference for developers, integrators, resellers, and business users where they gather for all things about Asterisk