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Hi Richard, sorry to hear you're having trouble with the phones,
This symptom can indicate either a problem with the line (phone company equipment or the wiring in your home - indicated if no other phones outside the gigaset system are working) OR a hardware failure in the base station (since the issue happens with all handsets, and indicated if other phones outside the system are working). We most often see this type of damage to the base unit as the result of a power surge, either through the phone or power lines.
Since you are able to use the intercom function, I would suspect that the relays which pick up the phone line in the base station have failed.
The one thing you may attempt yourself is to fully reset the system: 1) unplug both power and phone lines from the main base. 2) remove batteries from all handsets 3) wait at least 15 minutes, then restore all 4) place a handset on the main base for a minute, as if to charge 5) check for functionality.
If the problem persists after this, it tends to confirm a hardware failure which would require repairs to correct. Unfortunately once the 1 year warranty is up, repairs are not practical. Your best option at that point would be to replace the base station, if you can find a standalone one, since the handsets seem to still be working.
Typically you can't get just a base station alone (though you might try ebay), but you can get a new base with a single handset,
Gigaset SL400A Single DECT Bluetooth... (click for link)
which would work with your existing handsets, and add another to your system.