对于通过三大电信运营商直接办理和通过各级代理商办理这两种方式，可能很多人认为通过三大运营商的线下营业厅办理400电话是最为正规可靠的办理渠道，其实企业服务汇也是这样认为的，不过事实情况是目前在国内，三大电信运营商已经把将近九成的400业务都分发给了分布在全国各地的代理商，而电信运营商本身仅负责提供400号码资源及相关的经营资质，已经很少亲自受理400电话业务了，具体则由各级代理商负责400电话业务的办理、开发400的平台功能及对通讯线路的维护等。
For the three major telecom operators directly and through agents at all levels, many people may think that 400 telephone calls through the three major operators'off-line business hall is the most regular and reliable way to deal with, in fact, the enterprise service remittance is the same, but the fact is that the current situation in China, the three major. Telecom operators have distributed nearly 90% of their 400 services to agents all over the country. Telecom operators themselves are only responsible for providing 400-number resources and related business qualifications. They seldom accept 400 telephone services in person. Specifically, agents at all levels are responsible for handling and developing 400 telephone services. Platform function and maintenance of communication lines.