The high end hybrid desktop phone for voip and isdn or fixed line calling the gigaset dx800a all in one is the professional multiline desktop phone for small offices and home offices from its comfortably modern design to its large 35 tft colour display this corded phone has executive chic and the business like functionality to match being a hybrid phone means the gigaset dx800a all in one is truly flexible and can be configured to either ip with isdn or ip with fixed line b