A slightly different and serious question: I'm sure it works great to be able to make calls via VoIP and analogue phones like 20 years ago, but who needs it nowadays, please?
Back then, when we didn't have mobile internet or it was too expensive, you should have bought it, but today? Just think of all the great open source projects for today's very good smartphones, Threema or Threema Work (for business), or Whatsapp for free phone calls. Yes, telephoning is even free from a 30 Stutz subscription (Yallo (Sunrise), for example) and unlimited internet. If that's too expensive, just use WLAN.
The latest smartphone OS even have VoIP implemented natively. You can use it if you want.
I came across it by chance. I really don't understand how something like this can still be sold. Except for larger VoIP company networks (but also outdated architecture actually).

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A slightly different and serious question: I'm sure it works great to be able to make calls via VoIP and analogue phones like 20 years ago, but who needs it nowadays, please?
Back then, when we didn't have mobile internet or it was too expensive, you should have bought it, but today? Just think of all the great open source projects for today's very good smartphones, Threema or Threema Work (for business), or Whatsapp for free phone calls. Yes, telephoning is even free from a 30 Stutz subscription (Yallo (Sunrise), for example) and unlimited internet. If that's too expensive, just use WLAN.
The latest smartphone OS even have VoIP implemented natively. You can use it if you want.
I came across it by chance. I really don't understand how something like this can still be sold. Except for larger VoIP company networks (but also outdated architecture actually).

Accepted Answer

This part is probably only sold for one thing: Fax machines. There are various institutions that still have to have a fax machine (fire brigade, for example). 
That is why this device still has its raison d'être. 
There are other reasons, but the fax machine seems to me to be the most important.

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