The Gigaset E370 HX can be ordered as a separate extension handset without the need for a base station, as it can register directly with a DECT router. There are usually no mandatory accessories that need to be ordered as the phone is supplied with a charging stand and mains adapter. If you have a DECT router from Salt, the E370 HX should be compatible as it is designed to register with DECT base stations.
The charging station is included. But not a basic station. see: https://gse.gigaset.com/fileadmin/legacy-assets/CustomerCare/Manuals/E37x/E370HX/A31008-M2868-R101-1-4N19_de_AT-BE.pdf
Therefore only as a supplement for an existing system.
Night lock can only be set on the router or in the telecom provider's portal, it is not a Gigaset function.
It flashes when there are unanswered calls and network voicemails.
Thank you for pointing this out. I have passed this on once for checking, but I suspect that this cannot be adjusted as the description is sourced directly from the manufacturer by the supplier. In addition, our specifications state the phone type as handset only and the signal transmission as eco Dect, which makes it obvious that this is a handset only without an additional base station.
The compatibility list from Gigaset gives the answer: No.
But DX800A and E370HX are also not compatible according to the list - but it still works.
My advice: Either ask Gigaset or otherwise try it out and return it if there are compatibility problems.