本标准描述了PHS短消息中心（SMSC）和外部短消息实体（ESME）之间的通信协议。本协议简称CNPP（China Netcom Short Message Peer to Peer Protocol）。-descr iption of the standard PHS Short Message Center (SMSC) and external short messaging entities (ESME) between the communication protocol. The agreement referred to Behave (China Netcom Short Message Peer-to-P eer Protocol).