王牌交换机: AF424(4外线24分机) 人工值班(Operator mode) 电脑值班(Auto－attendant mode) 拨打外线(Direct dialing out) 拨打内线(Making internal calls)   征询转接(Inquiry for transfer) 三方通话 Three way conference(2 Ext and l C.O 1ine)   代接电话(Call pick up) 强插和监听(Priority access and monitoring) 自报分机号(Automatic reporting of extension numbers)