私有综合服务网络（PISN）是一种专用的通信网络，它提供了一系列的增值服务，如呼叫转移、呼叫等待和呼叫拦截等。呼叫拦截是一种特殊的增值服务，它允许用户在呼叫到达目标终端之前将其拦截并转移到其他终端。这项服务对于那些需要在不同终端之间灵活切换的用户来说非常有用。

ISO/IEC 15053:2003标准规定了呼叫拦截的功能模型和信息流。该标准定义了呼叫拦截的各种操作和消息，包括呼叫拦截请求、呼叫拦截确认、呼叫拦截取消等。这些操作和消息可以在PISN中进行，以实现呼叫拦截的功能。

除了呼叫拦截之外，ISO/IEC 15053:2003标准还规定了其他一些PISN的增值服务，如呼叫等待、呼叫转移和呼叫保持等。这些服务可以帮助用户更好地管理其通信需求，提高通信效率和便利性。

ISO/IEC 15053:2003标准适用于使用PISN的电信和信息技术领域。它可以帮助企业和组织更好地管理其通信需求，提高通信效率和便利性。此外，该标准还可以帮助厂商开发和实现PISN的增值服务，以满足用户的需求。

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 conformance statement (PICS) proforma 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 conformance statement (PICS) proforma for the supplementary services of call transfer and call diversion