The Wiki of Unify contains information on clients and devices, communications systems and unified communications. - Unify GmbH & Co. KG is a Trademark Licensee of Siemens AG.
Phone A and phone B are talking, phone A hooks on, phone B is still off-hook, the LCD of phone B shows "Disconnected". User B hears busy tone. After 10 seconds the LCD of phone B falls into idle mode and the busy tone has gone. When phone B gets an incoming call now the phone rings and user B can press OK key to answer the call.