ISO/IEC 21889:2001
Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Identification and Call Linkage Additional Network Feature
发布时间：2001-09-06 实施时间：


私有综合服务网络（PISN）是一种专用的通信网络，用于在企业内部或组织内部提供各种通信服务。PISN通常由私有分支交换机（PBX）和其他通信设备组成，可以提供语音通信、数据传输、视频会议等多种通信服务。PISN的互操作性和可靠性对于企业和组织的通信运营至关重要。

ISO/IEC 21889:2001标准规定了在PISN中使用的呼叫识别和呼叫链接附加网络功能的要求和规范。呼叫识别是指在PISN中对呼叫进行标识和识别，以便在呼叫过程中进行管理和控制。呼叫链接是指在PISN中对呼叫进行链接和跟踪，以便在呼叫过程中进行管理和控制。呼叫识别和呼叫链接是PISN中非常重要的网络功能，对于保证PISN的互操作性和可靠性具有重要意义。

ISO/IEC 21889:2001标准规定了呼叫识别和呼叫链接的具体实现方式和要求。其中，呼叫识别要求在呼叫开始时对呼叫进行标识和识别，并在呼叫过程中对呼叫进行管理和控制。呼叫链接要求在呼叫开始时对呼叫进行链接和跟踪，并在呼叫过程中对呼叫进行管理和控制。此外，ISO/IEC 21889:2001标准还规定了呼叫识别和呼叫链接的消息格式、参数和编码方式等细节要求。

ISO/IEC 21889:2001标准的实施可以提高PISN的互操作性和可靠性，确保PISN中的呼叫识别和呼叫链接功能得到有效实现。该标准的实施可以帮助企业和组织更好地管理和控制通信流量，提高通信效率和质量，从而提高企业和组织的运营效益。

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 -- Call Transfer Supplementary Service -- Part 1: Service description and protocol specification
ISO/IEC 11579-2:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer Supplementary Service -- 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 -- Call Transfer Supplementary Service -- Part 3: Test Suite Structure and Test Purposes (TSS&TP) specification
ISO/IEC 11579-4:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer Supplementary Service -- Part 4: Test Suite for ISDN Basic Call and Primary Rate Access Interfaces
ISO/IEC 11579-5:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call Transfer Supplementary Service -- Part 5: Test Suite for ISDN User-Network Interface (UNI) for the DSS1 protocol