C610H Handset of Gigaset Base station
Full function of Handset C610H on Gigaset C470/C475/C610. C610H handset can access by other Gigaset-Base Station (up to Gigaset 1000) for easy calling by telephone, maybe not all phone function supported the older base station.

The handest supported:
-ISDN-Base station, example Gigaset CX253 isdn, SX255 isdn, SX353 isdn -IP-Base, example C450 IP, C455 IP, S450 IP