Asterisk 12.0.0 Now Available!

By Matt Jordan

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.

Asterisk 12: New Features

  • 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 at
  • 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.

Next Steps

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!

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About the Author

Matt Jordan

Matt Jordan is an Engineering Manager for the Open Source Software team at Digium, working on Asterisk. Matt joined the team in 2011, and since then has been involved in the development of both Asterisk and the Asterisk Test Suite. His background in software development can best be described as "eclectic", having worked in a variety of industries. Uniting the various experiences, however, is a firm belief in good software development practices and methodologies and the effect they have on producing quality software (and keeping software developers from going insane).

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