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There are multiple supported feature frozen releases of Asterisk. Once a release series is made available, it is supported for some period of time. During this initial support period, releases include changes to fix bugs that have been reported. At some point, the release series will be deprecated and only maintained with fixes for security issues. Finally, the release will reach an its End of Life, where it will no longer receive changes of any kind.

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Release Series

Release Type

Release Date

Security Fix Only

EOL

1.2.X

 

2005-11-21

2007-08-07

2010-11-21

1.4.X

LTS

2006-12-23

2011-04-21

2012-04-21

1.6.0.X

Standard

2008-10-01

2010-05-01

2010-10-01

1.6.1.X

Standard

2009-04-27

2010-05-01

2011-04-27

1.6.2.X

Standard

2009-12-18

2011-04-21

2012-04-21

1.8.X

LTS

2010-10-21

2014-10-21

2015-10-21

10.X

Standard

2011-

12-15

2012-12-15

2013-12-15

11.x

LTS

2012-10-25

2016-10-25

2017-10-25

12.x

Standard

2013-

12-20

2014-12-20

2015-12-20

13.x

LTS

2014-10-24

2020-10-24

2021-10-24

14.xStandard2016-09-262017-09-262018-09-26

15.x

Standard

2017-10-03

2018-10-03

2019-10-03

16.xLTS2018-10-172022-10-112023-10-11

New releases of Asterisk will be made roughly once a year. Releases marked as , alternating between standard and LTS releases will be much less frequent. Within a given release series that is fully supported, bug fix updates are provided roughly every 4 weeks. For a release series that is receiving only maintenance for security fixes, updates are made on an as needed basis.

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The schedule for Asterisk releases is visualized below (which is subject to change at any time):

Gliffy Diagram

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nameAsterisk Release Schedule

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sizeL

For developers, it is useful to be aware of when the feature freeze for a particular branch will occur. The feature freeze for a branch will occur 3 months prior to the release of a new Asterisk branchversion, and a reminder announcement will be posted to the asterisk-dev mailing list approximately 60 days prior to the feature freeze. Asterisk versions are slated to be released the 3rd Wednesday of October. The feature freeze for a branch will occur the 3rd Wednesday of July. An announcement reminder will be posted to the asterisk-dev mailing list the 3rd Wednesday of May. Feature freeze consists of the creation of two branches: One for the release series and one for the initial release. Features can continue to be placed into the release series branch according to policy but the initial release branch will be frozen.

Feature Freeze Announcement Reminder

3rd Wednesday of May

Feature Freeze of Asterisk Branch

3rd Wednesday of July

First Release of Asterisk from Branch

3rd Wednesday of October