But in the traditional customer service center system of PBX, various applied software is constructed on the commutation system, for example function of ACD, interactive voice response - IVR etc.

• 但是在传统的PBX客户服务中心系统中，各种应用软件是构筑在交换系统之上的，比如ACD功能、交互式语音应答系统IVR等；