个人在学习5G标准3GPP TS 23501-g51过程中，也发现google的机器翻译实在晦涩难懂，所以个人在借助百度翻译（中国人更懂中文）的同时，人工对每句话进行了校对。

在自己学习的同时，也将翻译内容分享给给广大网友。由于个人能力有限，翻译不到位的地方还请各位网友们指正。

4.4.7 MSISDN-less MO SMS Service

MSISDN-less MO SMS via T4 is subscription based. The subscription provides the information whether a UE is allowed to originate MSISDN-less MO SMS.

通过T4发送的MSISDN-less MO SMS是基于订阅的。订阅提供是否允许UE发起MSISDN-less的MO SMS的信息。

The UE is pre-configured with the Service Centre address that points to SMS-SC that performs this MO SMS delivery via NEF delivery procedure. The recipient of this short message is set to the pre-configured address of the AF (i.e. Address of the destination SME). If UE has multiple GPSIs associated to the same IMSI, the GPSI that is associated with an SMS may be determined from the UE's IMSI and the Application Port ID value in the TP-User-Data field (see TS 23.040 [5]). The NEF may obtain the GPSI by querying the UDM with the IMSI and application port ID.

UE pre-configured了指向SMS-SC的Service Centre地址，SMS-SC通过NEF发送过程执行此MO SMS发送。此短消息的收件人设置为AF的pre-configured地址（即目标SME Address）。如果UE具有与同一IMSI相关联的多个GPSI，则可根据UE的IMSI和TP-User-Data字段中的Application Port ID值来确定与SMS相关联的GPSI。NEF可以通过使用IMSI和应用端口ID查询UDM来获得GPSI。

UE is aware whether the MO SMS delivery status (success or fail) based on the SMS delivery report from SMS-SC. The network does not perform any storing and forwarding functionality for MO SMS.

UE根据SMS-SC的SMS发送报告了解MO SMS发送状态（成功或失败）。网络不执行MO SMS的任何存储和转发功能。

See TS 23.502 [3] clause 5.2.6 for a description of NEF Services and Service Operations.