ISO/IEC 17877:2000
Information technology -- Telecommunications and information exchange between systems -- Private Integrated Services Network -- Specification, functional model and information flows -- Private User Mobility (PUM) -- Call handling additional network features
发布时间：2000-04-13 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、传真和视频会议等。用户移动性（PUM）是指用户可以在PISN中自由移动，而不会影响其通信服务。PUM可以分为两种类型：移动用户和固定用户。移动用户是指可以在PISN中自由移动的用户，而固定用户是指在PISN中固定位置的用户。

ISO/IEC 17877:2000标准规定了PUM呼叫处理的额外网络功能。这些功能包括呼叫等待、呼叫转移、呼叫保持、呼叫重试和呼叫拒绝等。呼叫等待是指当用户正在通话时，如果有另一个呼叫进来，用户可以选择接听或拒绝该呼叫。呼叫转移是指用户可以将呼叫转移到另一个用户或外部电话号码。呼叫保持是指用户可以将当前呼叫保持，以便在稍后恢复通话。呼叫重试是指当呼叫失败时，系统会自动重试呼叫。呼叫拒绝是指用户可以拒绝接听呼叫。

ISO/IEC 17877:2000标准还规定了PUM呼叫处理的功能模型和信息流。该标准定义了PUM呼叫处理的各种状态和事件，并描述了这些状态和事件之间的转换关系。此外，该标准还定义了PUM呼叫处理的信息流，包括呼叫请求、呼叫确认、呼叫振铃、呼叫接听、呼叫拒绝、呼叫转移、呼叫保持和呼叫恢复等。

总之，ISO/IEC 17877:2000标准规定了PUM呼叫处理的额外网络功能、功能模型和信息流。该标准为PISN中的用户移动性提供了更加灵活和便捷的通信服务。

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 -- 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 support of intelligent network capability set 1 (INCS1)
- 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 support of intelligent network capability set 2 (INCS2)