Terms for subject Electronics containing service class

English	Chinese
class of service	业务类型
directory number class of service	按业务类别的电话号码
Internet protocol class of service	因特网协议服务等级
line class of service	用户线业务类别
original class of service	发话服务等级
service class provider	服务等级提供者
service class user	服务等级使用者
terminating line class of service	终接线路业务类别
trunk class of service	业务中继等级
trunk group class of service	中继线群业务类别