purpose of the FXO port added on the new ATA models

quenenni
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Joined: Sat 02 of Jan, 2010

purpose of the FXO port added on the new ATA models

Posted:Sat 02 of Jan, 2010 (23:58 UTC)
Hello,

I noticed on the new ATA models found on the market (HandyTone 503 & Linksys SPA3000) that there is a PSTN (FXO) port added and a FXS port lost compared to the previous models (HT 502 & Linksys SPA2100)

What can I plug there? A PBX connection? But I already have my PBX connection thanks to my ATA?!
So, put another one? What's the purpose of this?

I don't see the point of it (but I think I'm missing something too)
But if several brands added it on their new models, I guess it means something..

And what about the "PSTN Pass-through Port" that exists since long and give the possibility to use the normal line instead of the VoIp system?
Isn't that the same as the PSTN (FXO) port newly added?

Can someone explain me on this?

Thanks