On a completely IP based system will the FXO ports act as analog terminal adapters? Will I be able to attach a fax machine without any further equipment?
FXO is not used to connect users, but to connect analog lines
You can try to connect them to the FXS ports, but to be frank, I have had more success using an HT80x for this.
UCM FXS lack options
UCM FXS has no options?
(often the translations on the forum only create confución)
Marcin is referring to the difference between David’s suggestion of using an HT over that of the FXS ports on the UCM. The HT has more configuration options which allows for more flexibility which improves the chances of the HT being able to better meet a given need.