一、400电话的顺序转接：当第一个用户呼入时，系统会根据绑定号码的先后顺序从第一个号码依次呼下去；如果第一个号码在忙或在通话，则当第二个主叫呼入时，系统会直接从第二个绑定号码依次呼下去，依此递推。
First, 400 telephone sequence transfer: when the first user calls in, the system will call down from the first number in turn according to the order of the binding number; if the first number is busy or on the phone, then when the second caller calls in, the system will call down directly from the second binding number in turn, and recurrence accordingly.
二、400电话的随机转接：有来电时，系统在绑定号码中随机抽取号码进行呼叫，当然，忙的号码是呼不了的，随机转呼是指转呼至空闲的绑定号码上。
2. Random transfer of 400 telephone calls: When there is an incoming call, the system randomly extracts the number from the binding number for calling. Of course, the busy number can not be called. Random transfer refers to calling to the idle binding number.
三、400电话的循环转接：当用户第一次拨打400电话号码时，系统从第一个绑定号码开始往下呼，第二次呼入时则从第二个绑定号码开始往下呼，第三次呼入时从第三个绑定号码开始往下呼，与此类推。
3. Cyclic transfer of 400 telephones: When the user first dials 400 telephones, the system starts calling down from the first binding number, starts calling down from the second binding number, and starts calling down from the third binding number, and so on.