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If you wish to use our code in other GPL programs, don't worry -- there is no requirement that you provide the same exception in your GPL'd products (although if you've written a module for Asterisk we would strongly encourage you to make the same exception that we do).

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In addition, Asterisk implements two several management/control protocols: . This includes the Asterisk Manager Interface (AMI), the Asterisk Gateway Interface (AGI), and the Asterisk Gateway REST Interface (AGIARI). It is our belief that applications using these protocols to manage or control an Asterisk instance do not have to be licensed under the GPL or a compatible license, as we believe these protocols do not create a 'derivative work' as referred to in the GPL. However, should any court or other judiciary body find that these protocols do fall under the terms of the GPL, then we hereby grant you a license to use these protocols in combination with Asterisk in external applications licensed under any license you wish.

The 'Asterisk' name and logos are trademarks owned by Digium, Inc., and use of them is subject to our trademark licensing policies. If you wish to use these trademarks for purposes other than simple redistribution of Asterisk source code obtained from Digium, you should contact our licensing department to determine the necessary steps you must take. For more information on this policy, please read:http https://www.digiumsangoma.com/enwp-content/company/profile/trademarkpolicy.phpuploads/Sangoma-Trademark-Policy.pdf

If you have any questions regarding our licensing policy, please contact us:

+1.877.344.4861 (via telephone in the USA)
+1.256.428.6000 (via telephone outside the USA)
+1.256.864.0464 (via FAX inside or outside the USA)
IAX2/pbx.digium.com (via IAX2)
[email protected] (via email)

Digium, Inc.
445 Jan Davis Drive NW
Huntsville, AL 35806
United States

Asterisk Sounds

License information for Asterisk sounds can be found in the Voice Prompts and Music on Hold License section.

Frequently Asked Questions about Licensing

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Wikipedia has a great article on open-source licenses, and opensource.org is a pretty definitive resource.

How does Digium legally provide Asterisk under alternative licenses other than the GPL?

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What is the GNU General Public License?

The GPL is a specific open-source license. Reading the preamble at this link is a great introduction, and below that is the full license text.

What if I want to distribute or license Asterisk under a different license?

Digium distributes Asterisk under a multi-licensing model often referred to also as Dual-licensing along with and is additionally made possible by a Contributors License Agreement. This allows Digium provides additional to provide Asterisk under licenses other than the GPL. Digium provides information on their alternative commercial licensing at their website.

Is dual-licensing beneficial for the future of open-source?

Digium believes so, and so do many open-source community members; here is a blog post by Tristan Rhodes and a blog post by Mark Spencer both arguing why dual-licensing is beneficial for open-source.

 

 

 

How can I contribute to Asterisk?

Documentation, new features, bug fixes, testing, protocol and programming expertise,, and general feedback are all welcome to the project. There is an overview that points to many resources for developers, also you can see the guidelines for contribution to see how it works.