... and inerfaces keys:Handsfree,Record,7'' touch-screen,Answer machine,quickly call Interfaces:Normal telephone line port,Extension SD port ... Applications 1.Customer sevice Dept: Using YD-V30 telephone can help the customer service dapartment,such as ticket booking,restarant ... property company,after-sale service dept and so on,it can i improve the satisfaction to know whether the customer called.Using ...