Asterisk 12.0.0 Now Available!

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The Asterisk Development Team is pleased to announce the release of Asterisk 12.0.0. This release is available for immediate download at

Asterisk 12 is the next major release series of Asterisk. It is a Standard release, similar to Asterisk 10. For more information about support time lines for Asterisk releases, see the Asterisk versions page:

For important information regarding upgrading to Asterisk 12, please see the Asterisk wiki:

As a Standard Release, Asterisk 12 contains many new major architectural improvements and features. A short list of some of these features includes:

* A new SIP channel driver and accompanying SIP stack named chan_pjsip has been
added. This new channel driver is based on the PJSIP SIP stack by Teluu. It
includes support for the vast majority of features currently in chan_sip,
as well as numerous architectural improvements that alleviate pain points
present in the legacy SIP channel driver. Users who wish to use the new SIP
channel driver are encouraged to read the instructions on installing and
configuring PJSIP for Asterisk on the Asterisk wiki at Detailed instructions on configuring
the new SIP stack in Asterisk can be found on the Asterisk wiki as well, at

* The Asterisk REST Interface (ARI) has been added. This interface lets
external systems harness the telephony primitives within Asterisk to develop
their own communications applications. Communication with Asterisk is done
through a RESTful interface, while asynchronous events from Asterisk are
encoded in JSON and sent via a WebSocket. More information on ARI can be found

* Major standardization of the Asterisk Manager Interface and its events have
occurred within this version. In particular, the names of Asterisk channels
no longer change and are stable throughout the lifetime of the channel.
More information on the changes in AMI can be seen in the AMI v2
Specification at

* All bridging within Asterisk is now performed using the Asterisk Bridging API,
which previously was only used by the ConfBridge application. This affords
Asterisk users greater stability, and has resulted in the abstraction of
channel masquerades, renaming, and other internal implementation details. It
also allows for the seamless transition between two-party and multi-party
bridges using core features.

And much more!

Please note that Asterisk 12 went through both an alpha and a beta testing process. During this time, many bugs were fixed, features enhanced, and improvements made. If you participated during the alpha and beta testing process, thank you! Please note that Asterisk 12 has changed as a result of the testing, and the UPGRADE and CHANGES notes should still be reviewed.

Information about the new features and changes in Asterisk 12 can be found on the Asterisk wiki:

A full list of all new features can also be found in the CHANGES file:

For a full list of changes in the current release, please see the ChangeLog:

Thank you for your continued support of Asterisk!