呼叫中心按照不同的使用性质,一般分成两类:自建型呼叫中心（in-house call center）和外包型呼叫中心（Outsourcing call center）。因为保密性、安全性和专业性等原因,很多企业在建设呼叫中心时,都希望拥有一个自已的呼叫中心。但呼叫中心对中继接入线路资源 Call centers are generally divided into two categories according to their nature of use: an in-house call center and an Outsourcing call center. Because of confidentiality, security and professional reasons, many enterprises in the construction of call centers, all want to have a call center of their own. However, call center access to the trunk line resources