Hello, Keepalive is sufficient. I have about 10 behind a NAT/firewall and no ports forwarded. However, this only applies when everything is open outbound.
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.
I recommend that you read the information on the product page in the section "with 25.- sipcall voucher" under "Warranty extension":
Benefit now from a 25.- franc sipcall voucher with every new registration!
So that you can make the most of your new VoIP device straight away, you will receive a free sipcall voucher worth CHF 25 when you register for the first time.
You will receive your voucher as follows:
1. register with sipcall using the link below (there are four products to choose from).
2. select "digitec" in the voucher section and enter your digitec/Galaxus order number in the separate field.
The CHF 25 will then be automatically credited to your sipcall account (offer only applies to new registrations).
Details
Amount CHF 25.00
URL http://www.sipcall.ch/anmeldung_digitec
Valid from 20.02.2015
Valid until 31.12.2019
Deadline 31.12.2019
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 Except for larger VoIP company networks (but also outdated architecture actually).
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