ISO/IEC 20113:2004
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Specification, functional model and information flows -- Make call request supplementary service
发布时间：2004-05-21 实施时间：


私有综合服务网络（PISN）是一种专用的通信网络，用于在组织内部提供通信服务。PISN可以提供多种通信服务，如语音通信、数据传输、传真等。在PISN中，呼叫请求补充服务是一种非常重要的服务，它可以提高通信的效率和质量。

ISO/IEC 20113:2004标准规定了PISN中呼叫请求补充服务的规范、功能模型和信息流。该标准包括以下内容：

1. 呼叫等待：当用户正在通话时，如果有另一个呼叫进来，PISN可以提供呼叫等待服务，让用户知道有另一个呼叫进来，并可以选择接听或拒绝。

2. 呼叫保持：当用户正在通话时，如果需要暂时中断通话，PISN可以提供呼叫保持服务，让用户可以在保持状态下进行其他操作，如接听另一个呼叫。

3. 呼叫转移：当用户无法接听呼叫时，PISN可以提供呼叫转移服务，将呼叫转移到其他用户或设备上。

4. 呼叫拒绝：当用户不想接听呼叫时，PISN可以提供呼叫拒绝服务，让用户可以拒绝呼叫。

5. 呼叫转接：当用户正在通话时，如果需要将通话转移到其他用户或设备上，PISN可以提供呼叫转接服务，让用户可以将通话转移到其他用户或设备上。

ISO/IEC 20113:2004标准的实现可以提高PISN中呼叫请求补充服务的效率和质量，使用户可以更加方便地进行通信。

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-related supplementary services -- 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 -- Call-related supplementary services -- 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-related supplementary services -- Part 3: 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 -- Call-related supplementary services -- Part 4: Protocol Implementation eXtra Information for Testing (PIXIT) for the supplementary services of call offer and call completion
- ISO/IEC 11579-5:1995 Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Inter-exchange signalling protocol -- Call-related supplementary services -- Part 5: Protocol Implementation eXtra Information for Testing (PIXIT) for the supplementary services of call transfer and call deflection