ISO/IEC 21888:2001
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Specification, functional model and information flows -- Call Identification and Call Linkage Additional Network Feature
发布时间：2001-09-13 实施时间：


私有综合服务网络（PISN）是一种专用的、企业级的通信网络，用于在企业内部提供语音、数据和视频通信服务。PISN可以提供许多附加网络功能，其中之一是呼叫识别和呼叫链接。ISO/IEC 21888:2001标准规定了这些附加网络功能的规范、功能模型和信息流。

呼叫识别是指在PISN中识别呼叫者的身份。呼叫链接是指在PISN中建立呼叫者之间的链接。这些功能可以帮助企业提高通信效率和安全性。

ISO/IEC 21888:2001标准规定了呼叫识别和呼叫链接的实现方式。它定义了PISN中的呼叫识别和呼叫链接的信息流，并描述了这些信息流的功能模型。此外，该标准还规定了PISN中呼叫识别和呼叫链接的接口和协议。

ISO/IEC 21888:2001标准的实现可以帮助企业提高通信效率和安全性。通过呼叫识别和呼叫链接，企业可以更好地管理通信流量，并确保只有授权的用户才能访问PISN。

相关标准
- ISO/IEC 11579-1:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Part 1: Protocol specification
- ISO/IEC 11579-2:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Part 2: Protocol implementation conformance statement (PICS) proforma
- ISO/IEC 11579-3:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Part 3: Abstract test suite (ATS) and protocol implementation extra information for testing (PIXIT)
- ISO/IEC 11579-4:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Part 4: Protocol implementation extra information for testing (PIXIT) for the network service
- ISO/IEC 11579-5:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Part 5: Protocol implementation extra information for testing (PIXIT) for the supplementary services