Asterisk is a complete PBX in software.  It provides all of the
features you would expect from a PBX and more. Asterisk does voice
over IP in three protocols, and can interoperate with almost all
standards-based telephony equipment using relatively inexpensive
hardware.

Asterisk provides Voicemail services with Directory, Call Conferencing,
Interactive Voice Response, Call Queuing. It has support for
three-way calling, caller ID services, ADSI, SIP and IAX.

This is an standard version.  It is secheduled to go to security
fixes only on November 18th, 2025, and EOL on November 18th, 2026.
See here for more information about Asterisk versions:
https://docs.asterisk.org/About-the-Project/Asterisk-Versions

Note that many things that have long been deprecated have now been
removed, such as chan_sip and app_macro.  See here for a complete
list:  http://docs.asterisk.org/Development/Asterisk-Module-Deprecations

Homepage:
https://www.asterisk.org/
