In FS you can use mod_callcenter, mod_verto, mod_fifo, mod_sofia, and sangoma cards (if you cannot use SIP for pstn).
Google around for it, go to https://freeswitch.org/confluence or read the books about FS.
sent from mobile
cell: +39 347 266 56 18
Giovanni Maruzzelli
OpenTelecom.IT
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