私有综合服务网络（PISN）是一种专用的通信网络，用于在组织内部或组织之间提供通信服务。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、数据和视频通信服务。PISN的优点是可以提供高质量的通信服务，并且可以根据组织的需求进行定制。

ISO/IEC 13866:1995标准规定了PISN中的呼叫完成补充服务。呼叫完成补充服务是指在呼叫过程中提供的额外服务，例如呼叫等待、呼叫转移和呼叫保持等。这些服务可以提高通信的效率和可靠性，使用户能够更加方便地进行通信。

ISO/IEC 13866:1995标准定义了呼叫完成补充服务的功能模型和信息流。功能模型描述了呼叫完成补充服务的基本功能和操作流程，包括呼叫等待、呼叫转移和呼叫保持等。信息流描述了呼叫完成补充服务的信息交换过程，包括呼叫请求、呼叫确认和呼叫完成等。

ISO/IEC 13866:1995标准的实施可以提高PISN的通信效率和可靠性，使用户能够更加方便地进行通信。该标准适用于使用数字传输技术的PISN，可以帮助组织设计和实施高质量的通信服务。

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 11582:1993 Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Circuit-mode 64 kbit/s bearer services — Service description, functional capabilities and information flows
- ISO/IEC 11583:1993 Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Circuit-mode 64 kbit/s bearer services — Service description, functional capabilities and information flows for supplementary services
- ISO/IEC 11584:1993 Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Circuit-mode 64 kbit/s bearer services — Protocol specification