本规范规定了PHS的短消息网关（SMGW）与计费中心之间的通信协议。 本规范主要适用于PHS的短消息网关（SMGW）和计费中心，为短消息网关（SMGW）接入计费中心提供技术依据。-the norms of the PHS Short Message Gateway (SMGW) and Billing Center between the communication protocol. This instruction applies to the main PHS Short Messag