400是基于智能网的语音增值业务，由主叫用户、被叫用户分摊支付通信费用。可以转接国内任何十部固话和手机，最多可选支持1000部电话，可以转接116114、118114等特服电话。是一项为被叫客户提供一个全国范围内的唯一号码，在全国任何范围内，只需拨打“400xxxxxxx”号码，不需加拨区号，均无需支付长途话费，便可按照业务客户预先设定的方案，将呼叫直接接续到指定的呼叫中心。中国联通400企业直线业务是800免费电话业务的升级版，业务特征与业务功能类似于已经广泛开放的800免费电话业务。实现企业对外宣传统一性、规范性、方便性，提升品牌形象。
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