Asterisk 20

Asterisk 20 is a long-term support (LTS) version of the open-source Asterisk framework for IP PBX, contact centers, and custom voice/video apps. It offers mature telephony features like call routing, IVR, queues, conferencing, voicemail, and recording, enhanced with modern SIP (PJSIP), ARI/REST, and AMI interfaces.

Core PBX Functions: Connects TDM, SIP, WebRTC endpoints with dialplan logic; deployable as standalone PBX or media server.
SIP & Apps: Improved TLS, headers, video support; ARI/AMI/AGI for app control.
Dev Focus: Bundled PJProject, expanded events, stability fixes for production use.