https://gse.gigaset.com/fileadmin/legacy-assets/CustomerCare/Manuals/C43x-C53x/C430-C430A-C530-C530A/A31008-M2502-F101-1-2X19_13-06-2016_de_CH.pdf Seite 37. Kurz gesagt: Ja es geht LG

If it becomes red hot, something is wrong. You should definitely report a defect before the thing blows up in your face. Of course, it's possible that only the batteries are defective. You can buy new batteries and see if that solves the problem. The batteries are not covered by the warranty. The usual warranty on batteries is 6 months.

Yes, I did that. Just plug it into the Tel socket on the box.

See page 35 of the manual supplied: Listening on handset/Base on/off: Navi button to the right/Answering machine/OK/"Listening"/change (tick). Done!

No, not with the Salt-Fiber Box, but with other VoIP ATAs. It is a normal DECT telephone with analogue connection and a cable length of less than 50m should not be a problem.

This should work. Anleitung Seite 46: http://gse.gigaset.com/fileadmin/legacy-assets/CustomerCare/Manuals/C43x-C53x/C430-C430A-C530-C530A/A31008-M2502-F101-1-2X19_13-06-2016_de_CH.pdf It may also work with speed dialling: *21..........# (instead of .......... the mobile phone number :) )

Unfortunately, the Gigaset C430A GO is not and will not be available in Switzerland. However, the models S850A GO, Sculpture A GO and E630A GO are available, currently even with a 10% discount.