Call Tracking指的是呼叫（）新业务。

A.Outgoing Call Barring
B.Incoming Call Barring
C.Outgoing Call Diversion
D.Incoming Call Diversion

A.Additional Information
B.Subscriber Facilities
C.Facility Categories
D.Call Diversion

A.计算机
B.键盘
C.网络
D.调制解调器