Fax for Asterisk (res_fax_digium) No Longer Supported in Asterisk 13 and Later

By Channing Hinkle

Since the release of version 1.8 in 2010, Asterisk has supported connectivity to two external fax modem solutions.  The first is the res_fax_digium module that is provided as a part of Digium’s Fax for Asterisk solution.  The second is the res_fax_spandsp module that ties into the open source spandsp solution.  Digium has continued to support both modules through the lifetimes of Asterisk 1.8, 10, 11 and 12.

Beginning with Asterisk 13, Digium will no longer make available the res_fax_digium module.  Instead, users requiring fax capabilities for Asterisk 13 and forward should use the res_fax_spandsp module.  Asterisk’s dial plan functionality for use of either res_fax_digium or res_fax_spandsp is nearly identical, allowing for simple migrations.

Users of prior versions of Asterisk can continue to use the Fax for Asterisk or spandsp solutions.  Users of Switchvox are not affected by this announcement.

For most Linux users, spandsp is already available as a system library. Questions about the use of res_fax_spandsp may be directed to the Asterisk Forums or to the Asterisk-Users mailing list.


Faxing in Switchvox 6.x has been revamped and no longer requires separate Fax for Asterisk keys. Users of Switchvox 5.x should still use Fax for Asterisk keys for faxing capability.

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There Are 3 Comments

  • Mike Katz says:

    I’m using Fax Configuration Professional. Will that continue to be supported? What do I need to do when I convert to Asterisk 13?

  • Channing Hinkle says:

    Fax Configuration Professional is not a Digium product. Is the product you are referencing a FreePBX module? If so, please contact them. If not, you will need to contact the vendor of the software product you are using.

  • Valber Santi says:

    I believe that the fax has become obsolete. It is no longer used by most companies and even cited in tenders for new customers, so the exclusion of it at this point does not affect the Asterisk

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About the Author

Channing Hinkle

Channing Hinkle is Product Manager for Digium Cloud Services (DCS), Asterisk hardware solutions, and Asterisk add-ons. He has over 20 years experience in the telecommunications industry working with everything from 56k digital data lines all the way up to 10Gbps fiber networks. He also has a working knowledge of VoIP services, dating all the way back to the early VoATM days. Channing enjoys the great outdoors, especially sitting around the old campfire with friends and family on a cool night. He is based in Huntsville, AL.

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