Res_fax or app_fax? with spandsp, Asterisk 13+


#1

I found that to send or receive a fax, I have a choice of res_fax + res_fax_spandsp or app_fax. Tried both and I successfully heard the fax sound with both modules.
Which one should I implement?

Thanks in advance.

Version: Asterisk 13.22.0/ Centos 7.5


#2

The res_fax module with res_fax_spandsp is the supported mechanism. The app_fax module is deprecated and may not exist in future versions.


#3

Thank you. I missed the following on the wiki.

https://wiki.asterisk.org/wiki/display/AST/New+in+1.8#Newin1.8-Fax

The app_fax module has been deprecated in favor of the res_fax module and
the new res_fax_spandsp backend.