1范围和应用领域本国际标准规定了（a）从一个会话实体向对等会话实体传输数据和控制信息的单一协议的程序；（b） 选择会话实体使用的功能单元的方法；（c） 用于传输数据和控制信息的会话协议数据单元的结构和编码。这些过程的定义是:（a）对等会话实体之间通过会话协议数据单元交换的交互； （b） 通过会话服务原语的交换，会话实体与同一系统中的会话服务用户之间的交互；（c） 会话实体和传输服务提供者之间通过传输服务原语的交换进行的交互。这些程序适用于支持OSI参考模型会话层且希望在开放系统环境中互连的系统之间的通信实例。本国际标准还规定了实施这些程序的系统的一致性要求。 它不包含可用于证明符合性的测试。

1Scope and Field of ApplicationThis International Standard specifies(a) procedures for a single protocol for the transfer of data and control information from one session entity to a peer session entity;(b) the means of selecting the functional units to be used by the session entities;(c) the structure and encoding of the session protocol data units used for the transfer of data and control information.The procedures are defined in terms of(a) the interactions between peer session entities through the exchange of session protocol data units;(b) the interactions between a session entity and the session service user in the same system through the exchange of session service primitives;(c) the interactions between a session entity and the transport service provider through the exchange of transport service primitives.These procedures are applicable to instances of communication between systems which support the Session Layer of the OSI Reference Model and which wish to interconnect in an open systems environment.This International Standard also specifies conformance requirements fo r systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance.