Beginning with Asterisk 13 Digium will no longer make available the res_fax_digium module (FFA or commercial versione): if you want fax capabilities you should use the res_fax_spandsp module.
Yes, I know, it is possible to use IAX modem, but sometimes I prefer use T.38 protocolo to receive fax, and only res_fax_spandsp can support this protocol. I’ll show hot to install res_fax_spandsp in a working IncrediblePbx 13 inst.
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