Multiple free incoming fax - limitations? license?

I’m running FreePBX Distro 1.815.210.58-1

I’m using the inbound fax-to-email feature to save paper. It seems to work great receiving faxes. (Thanks to all who gave their blood, sweat and tears to make this feature!)

Is there a Digium single-line license associated with this feature? Do I need to purchase more licenses? We probably receive up to 8 concurrent faxes (simultaneously) at peak times.

I haven’t tested multiple inbound faxes yet – and figured someone might know how this is implemented.


It appears that my version of FreePBX Distro uses spanDSP to handle faxes. I see messages from res_fax_spandsp.c in my /var/log/asterisk/full file. Therefore, it appears that there is no limitation on inbound faxes.