how many fxo/fxs on quintum A400 This topic has 1 reply, 1 voice, and was last updated 21 years, 2 months ago by Noname. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 28th October 2003 at 05:09 #25568 Jeff ChenGuest it says A400 has Fxo and Fxs ports? how many are there? two fxo and two fxs? 28th October 2003 at 12:46 #25569 NonameGuest No, that will be the A200, and you do not want that one for sure. The A400 have four FXS and four FXO. The FXO will be the PSTN ports, where you attach the dial tones from the phone company. The FXS are the PBS ports, where you attach phones, faxes or key phone system. The theory is that you could only make four calls total, betwen the two sets of ports, but I never tried to see what happens if you try to go over . Anyone tried?????? Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Voice over IP’ is closed to new topics and replies.